# SUBPART C - STRUCTURE

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3 (d) Flight envelope Note: Point G need not be investigated when the supplementary condition specified in CS is investigated. CS Design airspeeds Except as provided in sub-paragraph (a) (4), the selected design airspeeds are equivalent airspeeds (EAS). (a) Design cruising speed, VC. For VC the following apply: (1) VC (in knots) may not be less than (i) 33 W/S (for normal, utility and commuter category aeroplanes); and (ii) 36 W/S (for aerobatic category aeroplanes). where W/S = wing loading at design maximum take-off weight lb/ft 2. (2) For values of W/S more than 20, the multiplying factors may be decreased linearly with W/S to a value of 28 6 where W/S = 100. (3) VC need not be more than 0 9 VH at sea level. (4) At altitudes where an MD is established, a cruising speed MC limited by compressibility may be selected. (b) Design dive speed, VD. For VD the following apply: (1) VD/MD may not be less than 1 25 VC/MC; and (2) With VC min, the required minimum design cruising speed, VD may not be less than (i) 1 40 VC min for normal and commuter category aeroplanes; (ii) 1 50 VC min for utility category aeroplanes; and (iii) 1 55 VC min for aerobatic category aeroplanes. (3) For values of W/S more than 20, the multiplying factors in sub-paragraph (2) may be decreased linearly with W/S to a value of 1 35 where W/S = 100. (4) Compliance with sub-paragraphs (1) and (2) need not be shown if VD/MD is selected so that the minimum speed margin between VC/MC and VD/MD is the greater of the following: (i) The speed increase resulting when, from the initial condition of stabilised flight at VC/MC, the aeroplane is assumed to be upset, flown for 20 seconds along a flight path 7 5 below the initial path and then pulled up with a load factor of 1 5 (0 5 g. acceleration increment). At least 75% maximum continuous power for reciprocating engines and maximum cruising power for turbines, or, if less, the power required for VC/MC for both kinds of engines, must be assumed until 1 C 3

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