ICE PROTECTION - PROPELLER

Transcription

1 ICE PROTECTION - PROPELLER. DESCRIPTION This section describes the portion of the Ice Protection System pertaining to the propeller. This includes the slinger ring and the de-icing propeller boots. Grooved rubber boots are fitted to the root end of the propeller blade. Fluid is dispensed into the slinger ring where centrifugal force directs it to three individual feed tubes. Each feed tube aligns with grooves in the rubber boot which delivers fluid to the blade s leading edge. All Page

2 . MAINTENANCE PRACTICES A. Slinger Ring Assembly - Serials thru w/ Hartzell Factory Install (See Figure 30-60) () Removal - Slinger Ring Assembly (a) Remove propeller. (Refer to 6-0) (b) Remove bolts, washers, and nuts securing slinger ring to spinner bulkhead. (c) Remove bolt, washers, and nut securing feed tube to propeller hub. () Installation - Slinger Ring Assembly (a) Install bolt, washers, and nut securing feed tube to propeller hub and torque to ft-lb (. Nm). Note: Ensure feed tube mounting hose is in position before securing slinger ring. (b) Install bolts, washers, and nuts securing slinger ring to spinner bulkhead. (c) Install propeller. (Refer to 6-0) (d) Perform Operational Check - Slinger Ring Assembly. (Refer to ) (e) Perform Adjustment/Test - Dynamic Balance. (Refer to 6-0) (3) Inspection/Check - Blade Feed Tube Orientation (a) With propeller in full fine position, verify aft edge of feed tube tip is aligned with leading edge of blade, and gap between feed tube and propeller boot surface is 0.08 to 0. inches (.03 to 3.05 mm). (b) If feed tube is misaligned, perform Adjustment/Test - Blade Feed Tube Orientation (4) Adjustment/Test - Blade Feed Tube Orientation If necessary, use a needle nose vice grips to adjust feed tube. Do not kink feed tube during bending process. (a) With propeller in full fine position, position feed tube tip so it is located over second groove of propeller boot, and gap between feed tube and boot surface is 0. to 0. inches (.5 to 5. mm). (b) Repeat for other blade feed tubes. (5) Inspection/Check - Slinger Ring Feed Tube Orientation (a) Verify slinger ring feed tube is securely attached to bracket on engine baffle. (b) Verify slinger ring feed tube tip is centered inside of slinger ring, and minimum clearance between feed tube and any portion of slinger ring is 0.5 inch (3.8 mm). (6) Adjustment/Test - Slinger Ring Feed Tube Orientation If necessary, use a needle nose vice grips to adjust feed tube. Do not kink feed tube during bending process. (a) (b) Position feed tube so that feed tube tip is centered inside slinger ring. Ensure minimum clearance between feed tube and any portion of slinger ring is 0.5 inch (3.8 mm). Page Serials thru w/ Hartzell Factory Install

3 B. Slinger Ring Assembly - Serials & subs, T-000 & subs w/ Hartzell Propeller (See Figure ) () Removal - Slinger Ring Assembly (a) Remove propeller. (Refer to 6-0) (b) Remove sealing rings and nuts securing blade feed tubes to spinner bulkhead. (c) Remove bolts, washers, o-rings, standoffs, and nuts securing slinger ring to spinner bulkhead. () Installation - Slinger Ring Assembly (a) Install bolts, washers, o-rings, standoffs, and nuts securing slinger ring to spinner bulkhead. Torque to 50-0 in-lb ( Nm) and safety wire the nut. (b) Install sealing rings and nuts securing blade feed tubes to spinner bulkhead. (c) Install propeller. (Refer to 6-0) (d) Perform Operational Check - Slinger Ring Assembly. (Refer to ) (e) Perform Adjustment/Test - Dynamic Balance. (Refer to 6-0) (3) Inspection/Check - Blade Feed Tube Orientation (a) With propeller in full fine position, verify feed tube is centered over second groove of propeller boot and gap between feed tube and propeller boot surface is 0. to 0. inches (.5 to 5. mm). (b) If feed tube is misaligned, perform Adjustment/Test - Blade Feed Tube Orientation (4) Adjustment/Test - Blade Feed Tube Orientation If necessary, use a needle nose vice grips to adjust feed tube. Do not kink feed tube during bending process. (a) With propeller in full fine position, position feed tube tip so it is located over second groove of propeller boot, and gap between feed tube and boot surface is 0. to 0. inches (.5 to 5. mm). (b) Repeat for other blade feed tubes. (5) Inspection/Check - Slinger Ring Feed Tube Orientation (See Figure ) (a) Verify slinger ring feed tube is securely attached to bracket on engine baffle. (b) Verify feed tube tip is located outboard of slinger ring inside diameter and centered on non-flared portion of the groove. (c) Verify minimum clearance between feed tube and any portion of slinger ring is 0. inch (.54 mm). (d) Verify minimum clearance between feed tube and any portion of propeller hub is 0.5 inch (6.35 mm) (e) If feed tube is misaligned, perform Adjustment/Test - Slinger Ring Feed Tube. (Refer to 30-60) (6) Adjustment/Test - Slinger Ring Feed Tube Orientation (See Figure ) If necessary, use a needle nose vice grips to adjust feed tube. Do not kink feed tube during bending process. (a) Position feed tube so that feed tube tip is located outboard of slinger ring inside diameter and centered on non-flared portion of the groove. (b) Ensure minimum clearance between feed tube and any portion of slinger ring is 0. inch (.54 mm). (c) Ensure minimum clearance between feed tube and any portion of propeller hub is 0.5 inch (6.35 mm). Serials & subs, T-000 & subs w/ Hartzell Propeller Page 3

4 C. Slinger Ring Assembly - Serials -068 & subs w/ McCauley Propeller (See Figure ) () Removal - Slinger Ring Assembly (a) Remove propeller. (Refer to 6-0) Note: On airplanes equipped with McCauley propellers, the slinger ring and propeller feed tubes are integral to the spinner bulkhead. (b) Remove bolts, washers, and nuts securing spinner adapter and backing plate to spinner bulkhead and disassemble. () Installation - Slinger Ring Assembly (a) Assemble spinner adapter and backing plate to bulkhead and install bolts, washers, and nuts securing adapter and backing plate to spinner bulkhead. Torque to in-lb ( Nm). (b) Install propeller. (Refer to 6-0) (c) Perform Operational Check - Slinger Ring Assembly. (Refer to ) (d) Perform Adjustment/Test - Dynamic Balance. (Refer to 6-0) (3) Inspection/Check - Blade Feed Tube Orientation (a) With propeller in full fine position, verify aft edge of feed tube is aligned with forward edge of first propeller boot groove, beveled end of feed tube is oriented parallel with leading edge of propeller blade, and gap between feed tube and propeller boot surface is inch ( mm). (b) If feed tube is misaligned, perform Adjustment/Test - Blade Feed Tube Orientation. (4) Adjustment/Test - Blade Feed Tube Orientation Use needle nose vice grips to adjust feed tube. Do not kink feed tube. (a) With propeller in full fine position, position feed tube so aft edge of feed tube aligns with forward edge of first propeller boot groove, beveled end of feed tube is parallel with leading edge of propeller blade, and gap between feed tube and propeller boot surface is inch ( mm). (b) Repeat for other blade feed tubes. (5) Inspection/Check - Slinger Ring Feed Tube Orientation (See Figure ) (a) Verify slinger ring feed tube is securely attached to bracket on engine baffle. (b) Verify feed tube tip is located outboard of slinger ring inside diameter and at least 0. inch (5.0 mm) forward of aft edge of slinger ring. (c) Verify minimum clearance between feed tube and any portion of slinger ring is 0. inch (.54 mm). (d) Verify minimum clearance between feed tube and any portion of propeller hub is 0.5 inch (6.35 mm) (e) If feed tube is misaligned, perform Adjustment/Test - Slinger Ring Feed Tube. (Refer to 30-60) (6) Adjustment/Test - Slinger Ring Feed Tube Orientation (See Figure ) Use needle nose vice grips to adjust feed tube. Do not kink feed tube. Page 4 (a) (b) (c) Position feed tube tip so it is located outboard of slinger ring inside diameter and is at least 0. inch (5.0 mm) forward of aft edge of slinger ring. Verify minimum clearance between feed tube and any portion of slinger ring is 0. inch (.54 mm). Verify minimum clearance between feed tube and any portion of propeller hub is 0.5 inch (6.35 mm). Serials -068 & subs w/ McCauley Propeller

5 D. Operational Check () Operational Check - Slinger Ring Assembly (a) Visually inspect slinger ring assembly for condition and security. (b) Set battery master switch to ON position. (c) Set ice protection switch to MAXIMUM position. (d) Verify evidence of deicing fluid from feed tube. (e) Set ice protection switch to OFF position. (f) Set battery master switch to OFF position. All Page 5

6 E. Anti-Ice Propeller Boot (See Figure ) () Removal - Anti-Ice Propeller Boot (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose MEK Solvent - Any Source Solvent cleaning. Non-Metallic Scraper - Any Source Boot removal. Do not use any sharp object that could scratch the propeller blade. Extreme caution is suggested to assure the paint is not damaged. (b) Apply solvent to loosen corner of propeller boot. (c) Use scraper to pry corner of boot loose from blade. (d) Grasp raised edge of boot and apply steady pull. (e) Apply solvent along point of contact to loosen seal while continuing steady pull. (f) Solvent clean to remove adhesive residue. () Installation - Anti-Ice Propeller Boot WARNING: Blades with incorrectly painted surfaces or surfaces with no paint protection are likely to develop corrosion beneath the boot. (a) Inspect blade surfaces for chipped or missing paint. (b) If necessary, paint propeller blades. (Refer to 6-0) (c) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Silver Marking Pencil - Any Source Outline position of boot on propeller. Masking Tape - Any Source Mask off boot installation area. MEK Solvent - Any Source Solvent cleaning. Scotch Grip Rubber and Gasket Adhesive 300L 3M St. Paul, MN Adhere boot to propeller. Conductive Edge Sealer A56B SMR Technologies Fenwick, WV Seal around edge of boot. (d) Solvent clean bonding surfaces of propeller. Do not mix boots with different identification numbers on the same propeller. Page 6 (e) (f) (g) Verify identification number of boots to be bonded. Visually examine bond surface of boot to ensure it has a dull, blasted, or cross-hatch finish. Solvent clean bonding surface and exterior of boot. All

7 Note: Applying masking tape to top surface of boot helps prevent curling during installation. (h) (i) (j) (k) (l) (m) Apply masking tape to boot on straight end and along sides. Determine correct position of boot. To align inboard edge of boot, measure 0.5 inch (.3 cm) from propeller hub and mark blade for reference. Sight up leading edge of blade from tip to shank and place centerline mark on shank in line with leading edge centerline. 3 Position boot on blade and align centerline of boot with shank and leading edge centerlines. 4 Fold boot over blade and hold in position. 5 Trace outline of boot around entire perimeter except at shank. Mask approximately 0.5 inch (6.35 mm) outside of boot installation area with tape. Solvent clean bonding surfaces of propeller and boot. Apply one coat of adhesive to bonding surfaces of boot and propeller. Allow to dry hour minimum. Apply a second thin coat of adhesive to bonding surfaces of boot and propeller. Allow to dry until adhesive evaporates, approximately -3 minutes. Note: Parts must be joined before adhesive loses tack or adhesive must be reactivated by wiping with solvent. (n) Align centerline of boot along leading edge of propeller and press firmly to ensure no bubbles or gaps occur between boot and leading edge. Note: Avoid stretching boot during installation. Smooth out all bubbles and ensure no gaps exist between boot and blade surfaces. If boot is not aligned correctly, or bubbles or gaps exist, remove boot by pulling up using a quick motion and reapply boot. If adhesive is removed from either surface or becomes too dry, remove boot and reapply adhesive. (o) (p) (q) (r) Working from leading edge down, press boot firmly to blade surface. Remove masking tape from boot. Allow adhesive to cure a minimum of 8 hours at 60 to 80 F. Apply sealant along edges of boot. Note: Sealant shall not cover labels that may exist on propeller. Apply masking tape to achieve approximately.0 inch (.54 cm) total width centered on edge of boot. Apply masking tape to inboard area of hub adjacent to prop boot. Ensure sealant covers boot edge a minimum of 0.5 inch (6.35 mm). (s) 3 Apply one even coat of sealant and allow to dry 4 hours at 60 to 80 F. 4 Immediately remove masking tape from surface before sealant is dry. Solvent clean excess adhesive from propeller. All Page

8 NOTE Serials w/ Regular Weight Hub: Torque nuts to 0 - ft-lb. ( Nm). 3 Serials w/ Light Weight Hub: Torque nuts to 4-6 ft-lb. ( Nm). Torque nuts to 50-0 in-lb. ( Nm) Serials w/ composite spinner Serials thru LEGEND. Bolt. Feed Tube 3. P-Clip 4. Nut 5. Sealing Ring 6. Backnut. Washer 8. Spacer 9. Spinner Bulkhead 0. Standoff. O-ring. Slinger Ring 3. Bonded Seal 4. Propeller Boot, Anti-Ice 5. Screw 6. Hose. Safety Wire SR_MM30_560F Figure Ice Protection System - Serials & subs, T-000 & subs w/ Hartzell Propeller (Sheet of 3) Page 8 3 May 0 Serials & subs, T-000 & subs w/ Hartzell Propeller

9 LEGEND. Bolt. Feed Tube 4. Nut. Washer 9. Spinner Bulkhead. Slinger Ring 4. Propeller Boot, Anti-Ice 5. Screw 8. Backing Plate 9. Clamp 0. Adapter. Feed Tube Bracket NOTE Torque nuts to in-lb ( Nm). Torque screws to 5-80 in-lb ( Nm). SR_MM30_6A Serials w/ McCauley propeller Figure Ice Protection System - Serials w/ McCauley propeller (Sheet of 3) Page 9

10 inch (.54 cm) 0.5 inch (. cm) LEADING EDGE LEGEND 4. Propeller Boot, Anti -Ice. Sealant 3. Masking Tape NOTE Apply sealant to achieve.0 (.54 cm) inch total width centered on edge of boot. SR_MM30_566C Page 0 Figure Ice Protection System - Propeller (Sheet 3 of 3) All

11 PROPELLER HUB FEED TUBE SLINGER RING FEED TUBE SLINGER RING FEED TUBE SECOND GROOVE A A NOTE Feed tube tip location is outboard of slinger ring inside diameter and centered on non-flared portion of the groove. Minimum clearance between feed tube and any portion of the slinger ring is 0. inch (.54 mm). Minimum clearance between feed tube and any portion of the propeller hub is 0.5 inch (6.35 mm). With propeller in full fine position, orient feed tube inch (.54 mm mm) above boot surface with tip centered on second groove. SR_MM30_635A Figure Feed Tube Alignment - Serials & subs, T-000 & subs w/ Hartzell Propeller (Sheet of ) Serials & subs, T-000 & subs w/ Hartzell Propeller Page

12 FEED TUBE FIRST GROOVE PROPELLER HUB SLINGER RING FEED TUBE B B NOTE Minimum clearance between feed tube and any portion of the slinger ring is 0. inch (.54 mm). Minimum clearance between feed tube and any portion of the propeller hub is 0.5 inch (6.35 mm). Feed tube tip location is outboard of slinger ring inside diameter and at least 0. inch (5. mm) forward of aft edge of slinger ring. With propeller in full fine position, orient feed tube inch ( mm) above boot surface. Align aft surface of tube with forward edge of first groove. Orient beveled end parallel to blade leading edge. SR_MM30_63 Page Figure Feed Tube Alignment - Serials -068 & subs w/ McCauley Propeller (Sheet of ) Serials -068 & subs w/ McCauley Propeller