Related Rules This advisory circular relates specifically to Part 43 Subpart E, and Part 21 Subparts C, M, and N.

Transcription

1 Advisry Circular AC43-9 Mdificatins, Repairs, and the Frm CAA 337 Revisin 3 11 Nvember 2013 General Civil Aviatin Authrity advisry circulars cntain infrmatin abut standards, practices, and prcedures that the Directr has fund t be an Acceptable Means f Cmpliance with the assciated rule. An acceptable means f cmpliance is nt intended t be the nly means f cmpliance with a rule, and cnsideratin will be given t ther methds f cmpliance that may be presented t the Directr. When new standards, practices, r prcedures are fund t be acceptable they will be added t the apprpriate advisry circular. An advisry circular may als include guidance material t facilitate cmpliance with the rule requirements. Guidance material must nt be regarded as an acceptable means f cmpliance. Purpse This advisry circular prvides methds acceptable t the Directr fr shwing cmpliance with Part 43 and Part 21 when applying fr apprval f and embdying mdificatins and repairs. This material is intended fr thse persns wishing t have technical data apprved and t perfrm mdificatins and repairs. Related Rules This advisry circular relates specifically t Part 43 Subpart E, and Part 21 Subparts C, M, and N. Change Ntice Revisin 3 re-writes this advisry circular t accunt fr the change t Frm 337 and makes the AC clearer and mre cncise. Published by Civil Aviatin Authrity PO Bx 3555 Wellingtn Authrised by Manager Plicy and Regulatry Strategy

2 Advisry Circular AC43-9 Revisin 3 Table f Cntents Abbreviatins & Definitins... 3 Intrductin... 4 Sectin A General... 5 General... 5 Mdificatin and Repair Prcess... 6 Sectin B Technical Data... 8 General... 8 Apprval f Technical Data Sectin C Majr Mdificatins/Repairs Sectin D The Frm CAA 337; Instructins fr Use General Prcess Frm 337 Blck Apprval f Technical Data Cnfrmity f Majr Mdificatin r Majr Repair Appendix A Design Changes Which May Be Cnsidered Majr Nvember CAA f NZ

3 Advisry Circular AC43-9 Revisin 3 Abbreviatins & Definitins Fr the purpse f this Advisry Circular the fllwing definitins apply: IA means the hlder f a Certificate f Inspectin Authrisatin: The fllwing terms are referred t in this Advisry Circular and are defined in CAA rule Part 1: Definitins and Abbreviatins. Design change Maintenance Majr mdificatin Majr repair Technical data 11 Nvember CAA f NZ

4 Advisry Circular AC43-9 Revisin 3 Intrductin Anyne wh wants t mdify r change an aircraft, r any type certificated prduct, is cnfrnted with rules, prcedures, and terminlgy that may be cnfusing. Questins are raised such as: What is an aircraft mdificatin? What is the difference between apprved data and acceptable data? Hw d yu determine if a mdificatin is majr? Wh is respnsible fr determining if a mdificatin is majr? What kind f mdificatin requires a frm CAA 337? Wh can cmplete a frm CAA 337? What is the crrect prcedure fr btaining the varius mdificatin apprvals? What are the differences between ne-aircraft-nly apprval and an apprval fr duplicatin? The design change prcess requires judgement and a gd understanding f the applicable Civil Aviatin Rules. The licensed aircraft maintenance engineer is required t use experience, training, and familiarity with the Rules t cmplete the varius activities invlved. The CAA, hlders f inspectin authrisatins and Part 146 certificated design rganisatins are thers wh may play a part in the prcess and be called upn fr assistance. This advisry circular prvides guidance n the technical data t use t embdy a design change, in Sectin B the prcess f applying fr apprval f a design change by the apprval f the assciated technical data, in Sectin B determining if a mdificatin is majr r nt, in Sectin C cmpleting the frm CAA 337 in Sectin D. 11 Nvember CAA f NZ

5 Advisry Circular AC43-9 Revisin 3 Sectin A General General Part 43 prvides fr general maintenance f an aircraft and includes the means t embdy a design change t an aircraft. Hwever, it is imprtant t differentiate between a design change t an aircraft and maintenance which ensures the cntinued airwrthiness f an aircraft. Rule Part 1 defines a design change as a change t the type design. In ther wrds, has the aircraft r cmpnent changed frm hw it left the factry r frm hw the riginal manufacturer designed it? Fr example, the additin f a skin dubler repair patch r the replacement f a GPS unit with a newer mdel are design changes. Maintenance is ensuring the aircraft r cmpnent stays airwrthy as designed. Fr example, replacing a faulty piece f equipment with an identical, airwrthy cmpnent r carrying ut rutine inspectins, are maintenance activities. The first questin t ask is whether r nt the wrk being perfrmed is a design change r simply maintenance? Part 43 Maintenance Embdiment f a Design Change Type Certificate change Supplemental Type Certificate Mdificatin Repair using acceptable technical data OR Maintenance Ensuring cntinuing airwrthiness using acceptable methds, techniques, and practices. Figure 1: Initial decisin prcess fr a design change As mentined abve, Part 43 prvides fr the practical applicatin f design changes in the aircraft maintenance envirnment. It is Part 21 that prvides the certificatin basis and the prcedures that enable design changes t be apprved. Aircraft and ther type certificated prducts can be changed in a number f ways: Changes t a type certificate. These are design changes that are prpsed by the type certificate hlder. Part 21 Subpart D prvides the prcess and criteria fr changes t a type certificate. This type f design change is typically issued as a Service Bulletin. Supplemental type certificates (STC). These are design changes that are (usually but nt always) develped by sme-ne ther than the type certificate hlder. Supplemental type certificates can be prpsed by anyne and wuld typically include thse prpsals that frm a kit t be sld fr incrpratin by third parties int a type certificated prduct. Part 21 Subpart E prvides the requirements fr apprval f an STC, including the respnsibilities f an STC hlder. Repairs. These are a design change required t rectify a discrepancy, usually n an individual aircraft, and ften structural. A repair, while resulting in a change t the type design, is intended t restre the prduct t the same peratinal capability as befre. Fr example by the additin f a skin dubler and fasteners t restre strength t a cracked panel, r by a bush in a wrn bearing cmpnent. Part 21 Subpart M states that repairs are 11 Nvember CAA f NZ

6 Advisry Circular AC43-9 Revisin 3 t be treated as design changes and apprved in accrdance with Part 21 Subparts C, D and E. Mdificatins. These are design changes that are nt changes t type certificates nr supplemental type certificates. (Althugh the term mdificatin is ften used generally by industry t describe any design change.) Like repairs, mdificatins are nrmally individual changes, althugh under specific cnditins mdificatins can be duplicated n aircraft f identical make, mdel and mdified cnfiguratin. Mdificatins are apprved by apprving the technical data in accrdance with Part 21 Subpart N. This advisry circular cvers the apprval prcess fr mdificatins and repairs nly. Fr STCs, refer t advisry circular AC Fr changes t a type certificate, cnsult the CAA Aircraft Certificatin Unit. Mdificatin and Repair Prcess There are tw imprtant aspects t carrying ut a design change n an aircraft. Firstly the technical data used t manufacture and install the change must be acceptable and secndly, the effect f the mdificatin must be classified (i.e. majr r nt). The simplified prcess is shwn in Figure 2. D I have acceptable technical data? N Data Apprval Prcess (Frm CAA337 submitted t Part 146 certificated design rganisatin r CAA) Yes Is md/repair majr? N Yes Certify Cnfrmity (Frm CAA 337 signed by IA) Release- t- Service Figure 2. Simplified Mdificatin r Repair Prcess 11 Nvember CAA f NZ

7 Advisry Circular AC43-9 Revisin 3 Acceptable Technical Data? Rule requires that technical data be used nly if it is apprved, r is acceptable t the Directr. If the mdificatin r repair is nt defined by apprved r acceptable technical data then, referring t Figure 2, t prceed with the embdiment f the mdificatin, apprval f the data is first required. The apprval f technical data in accrdance with Part 21 Subpart N may be dne by the Directr r an aircraft Part 146 certificated design rganisatin wh emplys a senir persn hlding a delegatin frm the Directr t apprve mdificatins and repairs. Acceptable technical data and the technical data apprval prcess are discussed further in Sectin B. Is the mdificatin r repair majr? The embdiment f the design change must then be assessed fr the pssible effect f a failure. This is dne using the criteria given in the definitin f a majr mdificatin r repair. The assessment is made using the experience and judgement f the licenced aircraft maintenance engineer invlved. Cnsideratin shuld be given t the type f mdificatin, the difficulty f applicatin, the likelihd f an errr being intrduced, and ther safety implicatins. Referring t Figure 2, when the mdificatin is determined t be majr, an IA r a persn authrised by a Part 145 certificated maintenance rganisatin, will have t be cnsulted and used t certify cnfrmity f the majr mdificatin t the acceptable technical data. Sectin C prvides further guidance n the definitin f a majr mdificatin r repair. Frm 337: Apprval f Data / Cnfrmity Certificate Referring t Figure 2, there are tw separate purpses fr which the frm CAA 337 is required. Firstly, Part 21 specifies the use f the frm CAA 337 fr the apprval f technical data. Secndly, Part 43 Subpart E specifies the use f the frm CAA 337 t recrd the check f a majr mdificatin fr cnfrmity with the acceptable technical data. Once the cnfrmity inspectin and the frm CAA 337 have been cmpleted, the CAA 337 frm must be included in the aircraft maintenance recrds. The frm CAA 337 prvides sufficient detail t maintenance persns and the IA when assessing the cntinuing airwrthiness f the airframe, engines, prpellers, rtrs, and ther equipment. This advisry circular examines the frm CAA 337 in particular but the requirements shuld be read acrss t thse Part 145 certificated maintenance r Part 146 certificated design rganisatins using ther frms, fr cnfrmity r apprval respectively. Sectin D prvides detailed instructins fr filling ut the frm CAA Nvember CAA f NZ

8 Advisry Circular AC43-9 Revisin 3 Sectin B Technical Data General Fr any design change, there must be technical data which cmpletely defines the design change. This enables it t be manufactured and installed n an aircraft, and t be used fr cnfrmity fr any design change classified as a majr mdificatin r majr repair. Rule (a) requires that technical data shall nly be used if it is apprved r acceptable t the Directr. Acceptable Technical data Part 21 Appendix D lists technical data which the Directr has fund t be acceptable fr use in New Zealand. This list basically includes: technical data that has been apprved by the Directr technical data that ther peple have apprved and that the Directr has fund acceptable t use technical data that the Directr has reviewed and fund acceptable t use T have smething apprved and t have smething accepted bth require the presentatin f that data t the Directr. The bvius difference is that the Civil Aviatin Rules has defined apprved t mean apprved in writing by the Directr unless used with reference t anther persn. Part 21 Appendix D places cnditins n the use f acceptable data that include the data must be apprpriate t the prduct, cmpnent, r appliance, and directly applicable t the wrk being carried ut fr a freign supplemental type certificate r supplemental type apprval the data must nt intrduce a cmplete new flight manual (because the flight manual is referenced n the airwrthiness certificate) nt re-designate the aircraft type (because the Directr wuld need t amend the Aircraft Register and the aircraft dcuments wuld need t be re-issued) reference the particular freign type certificate accepted by the Directr. (This is t ensure the same certificatin basis was used fr apprval f the STC. This als means having the same certificatin categry. eg an STC apprved in the restricted categry wuld nt be acceptable technical data fr an aircraft which had been type accepted in the standard categry.) NOTE: STCs which d nt meet the abve cnditins, r which are frm a cuntry nt listed in Appendix D, may still be eligible fr acceptance under rule (a). An applicatin shuld be made t the Directr fr review and acceptance f the data. The installer has the written permissin f the supplemental type certificate r apprval hlder. (S that the hlder can cntact the installer n matters f cntinuing airwrthiness) The data prvided by the manufacturer f a cmpnent must nt cnflict with data prvided by the manufacturer f the prduct r assembly f which the cmpnent is t frm a part Acceptable technical data is nt necessarily in a frm that is able t be used immediately. Fr example, AC43-12 states that the use f nn-aernautical lead acid batteries is acceptable. This des nt say that the installatin f nn-aernautical lead acid batteries is apprved in all aircraft. Fr the particular installatin the technical data describing the actual installatin wuld require apprval as a design change. 11 Nvember CAA f NZ

9 Advisry Circular AC43-9 Revisin 3 Anther example f inapprpriate use f acceptable technical data is the installatin f electrical equipment where that equipment has the pssibility f verlading the aircraft electrical system. Fr all design changes which result in a change in electrical lad, an Electrical Lad Analysis (ELA) shuld be cnducted t verify the aircraft s electrical system can cpe. It may nly take an additinal 1amp lad t invalidate an aircraft s emergency battery time. This is ften frgtten but is just as imprtant as checking fr weight and balance effects. Subject t the cnditins n the use f technical data, the fllwing are acceptable technical data type certificate data sheets freign type certificate data sheets used fr the issue f a type acceptance certificate type design data fr type certificated prducts e.g. apprved drawings issued by the type certificate hlder design change data that supprt a design change apprved by the means specified in rule (i.e. mdificatins apprved under Part 21, Subpart N, STCs apprved under Part 21 Subpart E, changes t a type certificate apprved under Part 21 Subpart B, r data included in an airwrthiness directive issued under Part 39.) data apprved by the Directr under rule i.e. apprved by a frm CAA 337 data prvided by the Directr in an Advisry Circular airwrthiness directives that give specific instructins fr mdificatin r repair supplemental type certificates issued by the United States f America Federal Aviatin Administratin Australian Civil Aviatin Safety Authrity Transprt Canada supplemental type apprvals issued by Transprt Canada data giving specific instructins fr mdificatin r repair cntained in a maintenance manual, repair manual, verhaul manual, cntinuing airwrthiness dcument, service bulletin, r an equivalent prvided by the manufacturer f the prduct fr which it is t be used and which is listed in the type certificate r by reference in the type acceptance certificate i.e. data that has been apprved fr use by the type certificate hlder. Nte: This includes data prvided by the manufacturer f a cmpnent f a prduct where that cmpnent is a part f the apprved type design f the prduct. AC B, issued by the United States f America Federal Aviatin Administratin data included in, and specific t the categry f, an airwrthiness certificate data that has been accepted by the Directr under rule (a) by issue f a letter f acceptance e.g. EASA supplemental type certificates which have been individually accepted by the Directr. data that has been accepted by the Directr under rule (a) by issue f ntice given in a type acceptance reprt e.g. acceptance f EASA & FAA STCs fr the Bell 429 series when the type acceptance is based n a Transprt Canada Type Certificate. A similar ntice is listed in the AS350 type acceptance reprt. Ntes: The list abve cntains data additinal t that included in Part 21 Appendix D, plus sme further explanatry material and examples. 11 Nvember CAA f NZ

10 Advisry Circular AC43-9 Revisin 3 As a general rule, the test as t whether any technical data issued by a manufacturer is cvered by this list is whether it has been apprved. Fr example a signed and apprved drawing wuld be cnsidered part f the apprved type design, as wuld a frmal mdificatin bulletin. Hwever a letter frm their sales supprt department saying it is a gd idea, wuld nt. Neither wuld a letter frm their design ffice stating that the ffice had n bjectin t the technical change. Apprval f Technical Data Mdificatin r repair data may be develped by any persn. Hwever, as the data must still be reviewed and apprved by either the Directr r a Part 146 certificated design rganisatin, the develper shuld cnsult with the apprving rganisatin at an early stage t ensure the data will be suitable fr apprval and use. Fr ther than very basic mdificatins r repairs, it is recmmended that a Part 146 certificated design rganisatin shuld be cntracted t develp, shw cmpliance and apprve the technical data based upn the custmer s requirements. Nte: The Directr will nly accept applicatins t apprve technical data fr minr mdificatins r repairs which d nt require any flight testing r cmpliance inspectins, and fr which the dcumentatin is cmplete. Fr all applicatins, a minimum applicatin perid f 60 days will apply prir t the CAA reviewing the applicatin. Alternatively, the applicant can seek a Part 146 certificated design rganisatin fr the review and apprval f the technical data. Develpment f data As the mdificatin is develped the assembled technical data frms the mdificatin r repair package. This package includes descriptive data, cmpliance data, perating and maintenance data and any ther data needed t supprt the embdiment f the mdificatin. Descriptive data, such as manufacturing drawings and installatin instructins, is required t be sufficient fr the manufacture f parts and the embdiment f the mdificatin. If the mdificatin/repair is limited t a single installatin the descriptive data may be less frmal but must still cmpletely define the design change (fr example by marked-up phtgraphs). Cmpliance data, such as engineering reprts, lad analyses and testing results, refers t data that shws the design change is cmpliant with the applicable airwrthiness design standards. This data is generally prepared by the Part 146 certificated design rganisatin. Operating data, such as flight manual supplements, weight and balance changes, and Instructins fr cntinued airwrthiness, is required t ensure the safe peratin f the prduct with the design change embdied. Data apprval D I have Acceptable Technical Data? Yes N Data Apprval Prcess (Frm CAA 337 submitted t Part 146 certificated design Organisatin r CAA) Figure 3. Data apprval Rule states that the apprval f a mdificatin is by the apprval f the technical data. This reinfrces the fact that the technical data itself is apprved, nt the embdiment f that 11 Nvember CAA f NZ

11 Advisry Circular AC43-9 Revisin 3 mdificatin/repair. The embdiment f the mdificatin/repair relies n acceptable techniques, methds, and practices in accrdance with Part 43. In mst cases apprvals will be fr a single installatin in a prduct. Hwever, an apprval may be granted which allws duplicatin f the mdificatin/repair n ther identical aircraft makes and mdels prviding it is nt majr and the data presented with the frm CAA 337 is in sufficient detail t ensure accurate and repeatable installatin. Fr the apprval f a majr design change r fr acceptance by a freign regulatry authrity, a Supplemental Type Certificate (STC) wuld generally be necessary. Part 21 Subpart E and AC21-8 cver STCs in mre detail. Apprval will be based upn the mdificatin package meeting the applicable airwrthiness requirements. Part 21 requires cmpliance with these standards, and ther airwrthiness requirements, t be indicated by a statement f cmpliance issued by a Part 146 certificated design rganisatin r the Directr. The apprving persn will cnsider all aspects f the prpsal s design, its applicatin, and its pssible effects. A persn apprving a design may indicate n the frm CAA 337, in their pinin, whether the mdificatin r repair is classified as a majr mdificatin, r repair, r nt. Prprietary infrmatin T what extent is the technical data available after it is apprved? The actual apprval certificate f a mdificatin is publicly available infrmatin because it is an aviatin dcument defined by the Civil Aviatin Act Persns submitting technical data n the frm CAA 337 shuld ensure that infrmatin they cnsider t be cmmercially sensitive is nly listed n and attached t, rather than entered n, the frm CAA 337. Fr any mdificatin r repair which has been apprved fr multiple installatins, the frm CAA 337 standard wrding requires the installer t have the permissin f the wner f the design apprval. Figure 4 shws the relatinship between prprietary infrmatin and public infrmatin. Design Apprval Certificate Statements f Cmpliance Technical assessments, reprts, and analyses Public Infrmatin Cmmercial-in-cnfidence limits Figure 4. Prprietary infrmatin In any applicatin t the Directr fr mdificatin apprval, the technical data is treated as prprietary infrmatin and nly the apprval certificate itself culd be made available. 11 Nvember CAA f NZ

12 Advisry Circular AC43-9 Revisin 3 Sectin C Majr Mdificatins/Repairs Once acceptable technical data is available, ne f the steps in the embdiment f that mdificatin/repair is t decide if it is classed as majr. This invlves an assessment f its likelihd t affect the safety f the mdified aircraft. D I have Acceptable Technical Data? N Data Apprval Prcess (Frm CAA 337 submitted t Part 146 certificated design rganisatin r CAA) Yes Is Md/Repair Majr? N Yes Certify Cnfrmity (Frm CAA 337 signed by IA) Release t Service Figure 5. Majr mdificatin/repair assessment S hw is the determinatin f whether a mdificatin/repair is majr r nt made? In respect f the mdificatin, the embdiment shuld be assessed fr its ptential t cause structural cllapse lss f cntrl failure f mtive pwer unintentinal peratin f, r inability t perate, any systems r equipment essential t the safety r peratinal functin f the aircraft incapacitating injury t any ccupant unacceptable unserviceability r maintainability In cases where the mdificatin r repair is nt classified as majr, a cnfrmity certificatin is nt required and the embdiment f the mdificatin/repair and release- t- service is recrded in the 11 Nvember CAA f NZ

13 Advisry Circular AC43-9 Revisin 3 maintenance recrds. If the technical data used was apprved n a frm CAA 337, it shuld be included in the maintenance recrds t indicate that the previusly unapprved data has been apprved. The persn perfrming the mdificatin is primarily respnsible fr making the determinatin f whether the mdificatin r repair is majr r nt. If the mdificatin r repair is cnsidered t be majr, r the persn embdying the mdificatin is in anyway unsure, an IA shuld be cnsulted and will be required t certify cnfrmity f the mdificatin/repair t the applicable technical data. This assessment relies upn the experience, training, and familiarity f the licensed aircraft maintenance engineer with the tasks invlved t determine if the mdificatin r repair is majr r nt. Appendix A t this advisry circular prvides examples f mdificatins that may be cnsidered t be majr, and is useful fr judging whether t cnsult an IA. 11 Nvember CAA f NZ

14 Advisry Circular AC43-9 Revisin 3 Sectin D The Frm CAA 337; Instructins fr Use General The frm CAA 337 serves t track the mdificatin r repair prcess frm cnceptin t embdiment. The frm CAA 337 can recrd bth technical data apprval and cnfrmity certificatin. The frm shuld be raised when n acceptable technical data exists, r when the use f that data cnstitutes a Majr mdificatin/repair. The frm CAA 337 prvides wners and peratrs with a recrd indicating details and apprval f majr mdificatins and majr repairs and prvides the CAA with a cpy f the details and apprval fr the aircraft recrds. D I have Acceptable Technical Data? Yes N Data Apprval Prcess (Frm CAA 337 submitted t Part 146 certificated design Organisatin r CAA) Is Md r Repair majr? N Yes Certify Cnfrmity (Frm CAA337 signed by IA) Release t Service Figure 6. Frm CAA 337 Usage Referring t Figure 6, the tw uses fr the frm CAA 337 are Technical data apprval. Rule requires mdificatins t be apprved by the apprval f the technical data in accrdance with rule which specifies the use f the frm CAA 337. Cnfrmity certificatin. Part 43 Subpart E requires that majr mdificatins and majr repairs be certified fr cnfrmity by an IA r a persn authrised by a Part Nvember CAA f NZ

15 Advisry Circular AC43-9 Revisin 3 certificated maintenance rganisatin. The IA shuld determine the airwrthiness f the prduct by inspecting majr repairs r majr mdificatins fr cnfrmity t the applicable technical data and cmpatibility with previus repairs r mdificatins made t the aircraft. As part f this task, the IA shuld ensure that the applicable technical data is apprved r acceptable. Each term referred t abve describes a different aspect f the mdificatin prcess. There are, therefre, fur pssible cmbinatins fr mdificatins r repairs Technical Data Effect Frm 337 Purpse Acceptable Majr Cnfrmity certificatin Acceptable Nt majr Frm CAA 337 nt required Nt acceptable Majr Technical data apprval & cnfrmity certificatin Nt acceptable Nt majr Technical data apprval Part 146 certificated design rganisatins and Part 145 certificated maintenance rganisatins may use dcuments ther than the frm CAA 337. Prcess The persn wishing t perfrm a mdificatin r repair shuld determine if acceptable data is available prir t cmmencement f the wrk. If there is n acceptable data, r the acceptable data is nt applicable t the wrk being carried ut, a frm CAA 337 will need t be raised t apprve the technical data. The descriptive, cmpliance, and ther data may be entered n, r preferably cntained in ther dcuments which are referenced n the frm CAA 337. The technical data and the frm CAA 337 apprval certificate cmprise the mdificatin package r repair scheme. The data must be apprved by the Directr r a senir persn emplyed by a Part 146 certificated design rganisatin delegated the pwer t apprve design changes. An IA cannt apprve data. The apprving persn will assess the cntent f the mdificatin package and, depending n the requirements f the riginatr and the detail f the package, apprve the technical data fr embdiment n ne r mre aircraft. The apprving persn may als suggest whether the mdificatin r repair cnstitutes a majr mdificatin r majr repair. Sectin B f this advisry circular prvides an verview f the apprval f technical data. Once the technical data has been apprved, the persn wh is authrising the mdificatin/repair fr release t service shuld determine whether the wrk is majr r nt. Sectin C f this advisry circular prvides mre guidance n this determinatin. The wrk may be perfrmed by a persn in accrdance with Part 43 but if the mdificatin r repair is determined t be majr, an IA is required t subsequently certify cnfrmity n the frm CAA 337. The inspectin f a majr mdificatin r majr repair by an IA cnsists f the fllwing basic peratins determining that the mdificatin r repair has acceptable data inspecting the cnfiguratin f the mdificatin r repair fr cnfrmity t the acceptable technical data and the maintenance perfrmance standards f Part 43 ensuring that the aircraft still cmplies with the applicable airwrthiness requirements and the mdificatin r repair des nt cnflict with ther installatins 11 Nvember CAA f NZ

16 Advisry Circular AC43-9 Revisin 3 ensuring any flight manual supplement is added t the aircraft flight manual determining that the prper aircraft maintenance recrd entries have been made and that the weight and balance data, electrical lad analysis and equipment list has been revised, when apprpriate. A statement n the frm CAA 337 shuld reflect any such revisins certifying cnfrmity using the frm CAA 337 and returning it t the persn wh perfrmed the wrk. Dual Use f the Frm CAA 337 There may be a case where the frm CAA 337 is used fr bth the apprval f the technical data describing a design change and then fr cnfrmity f the installatin t the same technical data. In this case ne frm may be used fr bth purpses and all blcks will be cmpleted. It is imprtant that the technical data describing the design change is apprved first t ensure it becmes acceptable technical data. Alternatively, the cnfrmity can be dne n a new frm CAA 337 which references the riginal design change. Reference and attaches a cpy f the frm CAA 337 that was used fr data apprval. Frm 337 Fields The instructins n the fllwing pages apply t the crrespnding blcks f the frm CAA 337. Fllwing frm cmpletin The Part 146 certificated design rganisatin is respnsible fr ensuring a cpy f the frm CAA 337 is frwarded t the CAA within 28 days f the design change being apprved The cnfrmity signee is respnsible fr ensuring a cpy f the frm CAA 337 is frwarded t the CAA within 7 days f the wrk being inspected attached t the engine/prpeller/cmpnent if nt installed given t the aircraft wner t frm part f the aircraft maintenance recrds after installatin. The persn certifying release- t- service is respnsible fr making the prper entry in the aircraft maintenance recrds making reference t the frm CAA Nvember CAA f NZ

17 Advisry Circular AC43-9 Revisin 3 Frm 337 Blck Design change Reference/Title Apprval f Technical Data Enter a unique identifying number and shrt title specified by the Applicant. Cnfrmity f Majr Mdificatin r Majr Repair Enter the design change reference f the technical data t be used fr cnfrmity. 1. Aircraft Cmplete details f the aircraft applicability. Nte: This can be ne r mre aircraft f the same make and mdel. Fr mdificatins that can be duplicated, the serial n. & registratin fields can be left blank. 2. Applicant Cmplete details f the rganisatin r persn applying fr apprval f the mdificatin/repair data. Nte: The Frm CAA 337 des nt cnstitute cmmercial r intellectual prperty wnership. This shuld be dealt with separately by the parties invlved. Cmplete details f the Aircraft that the mdificatin/repair is installed n. In the case f mds applicable t mre than 1 aircraft, cmplete a separate frm CAA 337 fr each aircraft and clearly identify the applicable aircraft registratin/serial n. Nte: When a majr mdificatin/repair is made t a cmpnent nt fitted t the aircraft, the serial number and registratin sectins f this blck will be left blank. Cmplete details f the rganisatin r persn perfrming release- t- service fr the embdiment f the design change i.e. the installer f the mdificatin/repair. 3. Unit Identificatin Where an engine, prpeller, r cmpnent is t be mdified r repaired, enter the details f the item. The frm CAA 337 remains with the cmpnent until such time as the cmpnent is installed n an aircraft. Nte: The persn installing the cmpnent shuld then give a cpy f the frm CAA 337 t the aircraft wner t be entered in the aircraft maintenance recrds and make an entry in the aircraft maintenance recrds making reference t the frm CAA 337 and file a cpy f the frm CAA 337 with thse recrds. 4. Type f Actin Identify in the apprpriate clumn if the cmpnent is mdified r repaired. 11 Nvember CAA f NZ

18 Advisry Circular AC43-9 Revisin 3 Frm 337 Blck 5. Technical Data classificatin 6. Applicatin fr apprval f technical data Apprval f Technical Data Tick the check bx that states the technical data requires apprval and I apply fr apprval and fill ut the name f the persn wh can be cntacted fr further details n the applicatin (i.e. mdificatin wner). The applicant must fill this sectin ut with details f any substantiating data such as stress analyses, test reprts, sketches, r phtgraphs if available. Befre the apprval f any new technical data can be cmpleted the data must be assessed fr cmpliance with airwrthiness design standards. The issue f a statement f cmpliance indicates successful cmpletin f this assessment. If a Part 146 certificated design rganisatin is respnsible fr the cmpliance data, a reference t the cmpliance reprts and the statement f cmpliance shuld be listed here. Cnfrmity f Majr Mdificatin r Majr Repair Check rule Part 21 Appendix D t make sure the mdificatin r repair data t be used, as detailed in Sectin 8, is acceptable technical data and tick the check bx that states the data is Acceptable Technical Data. If nt, the data will require apprval by a Part 146 certificated design rganisatin r the CAA prir t signing fr cnfrmity. Fill ut the name f the persn wh can be cntacted fr further details n the cnfrmity applicatin. N/A D nt cmplete. 11 Nvember CAA f NZ

19 Advisry Circular AC43-9 Revisin 3 Frm 337 Blck 7. Apprval f Technical Data Apprval f Technical Data Only the CAA r a Part 146 Design Delegatin Hlder (DDH) can fill ut this sectin. The persn apprving the data will indicate in this blck: - whether the mdificatin r repair is apprpriate fr ne aircraft nly. - can be applied t identical aircraft. (Nte: The riginal applicant fr design apprval must give written apprval t the installer. This is required t ensure that a relatinship is established between the design apprval hlder and installer. This relatinship shuld include full disclsure f all required technical data and recrding f installers fr tracking f cntinued airwrthiness.) - the mdificatin r repair is majr r nt. (Nte: This determinatin is nt mandatry and nly serves as advice t the installer n the need fr a Cnfrmity Inspectin). The relevant checkbxes shuld be ticked and preferably lines shuld be put thrugh the ptins that are nt ticked. Cnfrmity f Majr Mdificatin r Majr Repair D nt cmplete this sectin but if the frm was als used fr data apprval, check t see whether, in the apprver s pinin, the mdificatin r repair is majr r nt. It is still the installer s respnsibility t determine if the mdificatin is majr. 11 Nvember CAA f NZ

20 Advisry Circular AC43-9 Revisin 3 Frm 337 Blck 8. Technical Data Technical Data List and Descriptin f Changes Apprval f Technical Data The applicant must enter a cmplete list f the data that requires apprval, including the specific revisin number/date. The Part 146 certificated design rganisatin r CAA may add t this list if further data is deemed necessary t describe the mdificatin r repair. The descriptin shuld state the lcatin f the mdificatin r repair, relative t the aircraft r cmpnent. Cnfrmity f Majr Mdificatin r Majr Repair A clear, cncise and legible statement describing the wrk carried ut t embdy the design change shuld be entered in this blck. List the acceptable technical data t be used as the basis fr certifying the mdificatin/repair, including the revisin number r date. Fr example, the reference simply t FAA AC B is insufficient whereas the reference t a specific sectin and paragraph r figure number enables the clear identificatin f the wrk cmpleted. The descriptin shuld state the lcatin f the mdificatin r repair, relative t the aircraft r cmpnent. If the mdificatin is a radi cmmunicatin r navigatin mdificatin the apprpriate apprval level sught shuld be indicated n the frm. AC43-10 details equipment apprval levels. If the repair r mdificatin is t be cvered with ther structure then a statement shuld be made certifying that a pre-cver inspectin was carried ut and the wrk cmpleted is satisfactry. Weight & Balance Data Where the weight and balance f the aircraft are affected, state the changes here listing parts separately if lcated at different mment arms. If the change is negligible state the reasn why. Weight and balance changes shuld be recrded in the aircraft recrds with a reference t this frm CAA 337. Dcument Amendments List any existing dcuments that require amendment as part f the mdificatin r repair, including their revisin number r date. Dcuments may include the Aircraft Flight Manual (AFM), Instructins fr Cntinuing Airwrthiness (ICA), Maintenance Manual, Electrical Lad Analysis (ELA), Frm 2129 (Radi Statin Equipment), Frm 2173 (Weight and Balance). 11 Nvember CAA f NZ

21 Advisry Circular AC43-9 Revisin 3 Frm 337 Blck 9. Cnditins f Apprval 10. Cnfrmity Statement Apprval f Technical Data The Part 146 certificated design rganisatin r CAA may cmplete this sectin with any special cnditins r restrictins applicable t the technical data (e.g. serial number limitatins). N/A D nt cmplete. Cnfrmity f Majr Mdificatin r Majr Repair If cnditins have been cmpleted by a Part 146 certificated design rganisatin, ensure that the mdificatin/repair cmplies with these cnditins. A cnfrmity statement is nly required if the mdificatin r repair is majr. The definitin f majr is discussed in this AC. Cnfrmity can nly be assessed against acceptable technical data (nte: apprved data is acceptable technical data). Only a persn that meets the requirements f Part 43 Subpart E may certify fr cnfrmity. 11 Nvember CAA f NZ

22 Advisry Circular AC43-9 Revisin 3 Appendix A Design Changes Which May Be Cnsidered Majr Mdificatins/repairs that may be cnsidered t be majr include, but are nt limited t, the fllwing increases in grss weight r changes in the centre f gravity range changes that affect the weight and balance that have the ptential t affect the handling characteristics r structural strength. installatin r relcatin f equipment and systems r changes which may adversely affect structural integrity, flight, r grund handling characteristics f the aircraft, including pressurisatin systems alternate static air r pressure systems initial r prttype installatin f an autmatic pilt r autmatic apprach system mdificatin f autmatic pilt r autmatic apprach system which changes serv frces, serv rates, r any flight cntrl r perfrmance characteristics relcatin r change f thrttle levers, flap cntrls, and similar items changes t nn-pressurised aircraft that require cutting f metal r plywd stressed skin mre than 150 mm in any directin changes that require drilling r cutting int any pressurised skin changes that require the making f additinal seams in r splicing f skin sheets changes t mvable cntrl surfaces which may adversely disturb the dynamic and static balance, alter the cntur, r alter the weight distributin changes in the cntrl surface travel, cntrl system mechanical advantage, lcatin f cntrl system cmpnent parts, r directin f mtin f cntrls changes in basic dimensins r external cnfiguratin f the aircraft, such as wing and tail plan-frm r incidence angles, canpy, cwlings, cntur r radii, r lcatin f wing and tail fairings changes t landing gear, such as internal parts f shck struts, length, gemetry, numbers, r brakes and brake systems changes t engine cwling and baffling which may adversely affect the flw f cling air, and changes t maniflding changes t fuel, il, hydraulic systems which may affect the fluid flw r system peratin such as - relcatin f exterir fuel vents, use f hydraulic cmpnents, tube material, and fittings nt previusly apprved, use f new type fusible hydraulic plugs changes in fuel dump valves, new fuel cell sealants, 11 Nvember CAA f NZ

23 Advisry Circular AC43-9 Revisin 3 new fuel r il system cmpnents changes t the basic engine r prpeller design cntrls r perating limitatins changes t the engine exhaust system changes that affect carburettr air inductin changes invlving engine cntrls changes in a fixed fire extinguisher r detectr system which may adversely affect the system effectiveness r reliability, including relcatin f discharge nzzle r detectr units use f new r different detectr cmpnents in new circuit arrangements deletin f detectr units r discharge nzzles changing the extinguishing agent r decreasing the amunt f extinguishing agent mdificatins t radi cmmunicatins and navigatinal systems which may adversely affect reliability r airwrthiness, such as large changes t electrical lads changes invlving multiple avinics equipment changes t integrated avinics systems changes t aircraft structure r interir f aircraft which may adversely affect evacuatin f ccupants - changes t persnnel and carg accmmdatins changes t smke/fire detectin and suppressin systems in the cabin r carg areas changes t items in the head strike paths f crew r passengers changes affecting TSO seats r seatbelts changes t the emergency xygen system changes t the pressurisatin system use f synthetic cvering materials replacement f fabric cvering using ther than the riginal types f materials, fasteners, r bth ceramic catings use f synthetic resin glues new stripping r plating catings new welding, brazing, r ther prcessing techniques. 11 Nvember CAA f NZ