(b)
VNEi means instrument .ight never exceed speed, utilized instead of VNE for com-pliance with maximum limit speed requirements for instrument .ight.
(c)
Vmini meansinstrument .ight minimumspeed,utilizedincomplying with minimum limit speed requirements for instrument .ight.]
Amdt. 29-21, E.. 3/2/83
FAR29.B3 :[III.Trim.]
[It must be possible to trim the cyclic, collective, and directional control forces to zero at all approvedIFR airspeeds,power settings, and con.gurations appropriate to the type.] Amdt. 29-21, E.. 3/2/83
FAR29.B4 :[IV.Staticlongitudinal stability.]
(a)
[General. The helicopter must possess positive static longitudinal control force sta-bility at critical combinations of weight and center of gravity at the conditions speci.edinparagraphsIV(b) through(f) of thisAppendix.The stickforce must vary with speed sothat any substantial speed changeresultsin astickforceclearly perceptibletothepilot.The airspeed must returnto within10percent of thetrim speed when the control force is slowly released for each trim condition speci.ed in paragraphsIV(b) through(f) of thisAppendix.
(b)
Climb.Stability mustbeshowninclimb throughoutthespeed range20knotseither side of trim with–
(1)
The helicopter trimmed at VYi ;
(2)
Landinggear retracted(if retractable); and
(3)
Power requiredforlimit climb rate(atleast1,000fpm) at VYi or maximum continuous power, whichever is less.
(c)
Cruise. Stability must be shown throughout the speed range from 0.7 to 1.1VH or VNEi, whichever is lower, not to exceed ±20 knots from trim with–
(1)
Thehelicoptertrimmedandpoweradjustedforlevel.ight at0.9VH or0.9VNEi, whichever is lower; and
(2)
Landinggear retracted(if retractable).
(d)
Slow cruise. Stability must be shown throughout the speed range from 0.9Vmini to 1.3Vmini or 20 knots above trim speed, whichever is greater, with–
(1)
The helicopter trimmed and power adjusted for level .ight at 1.1Vmini ; and
(2)
Landinggear retracted(if retractable).
(e) Descent. Stability must be shown throughout the speed range 20 knots either side of trim with–
(1) The helicopter trimmed at 0.8 VH 0.8 VNEi (or 0.8 Vle for the landing gear extended case), whichever is lower;
(2) Power requiredfor1,000fpmdescent attrim speed; and
(3) Landing gear extended and retracted, if applicable.
(f) Approach. Stability must be shown throughout the speed range from 0.7 times the minimum recommended approach speed to 20 knots above the maximum recom-mended approach speed with–
(1) The helicopter trimmed at the recommended approach speed or speeds;
(2) Landinggear extended and retracted,if applicable; and
(3) Power required to maintain a3'glidepathandpower required to maintain the steepest approachgradientfor which approvalis requested.]
Amdt. 29-21, E.. 3/2/83
FAR29.B5 :[V.Staticlateral-directional stability.]
(a) [Static directionalstability mustbepositive throughout the approved ranges of airs-peed,power,and vertical speed.In straight,steady sideslipsup to ±10'from trim, directional controlposition mustincreasein approximately constantproportionto angle of sideslip. At greater angles up to the maximum sideslip angle appropriate tothetype,increaseddirectional controlposition mustproduceincreased angle of sideslip.
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本文鏈接地址：FAA規(guī)章 美國聯(lián)邦航空規(guī)章 Federal Aviation Regulations 5(112)
