2
(iii) Theaircrafttrimmedforlevel.ightwiththepowerrequiredinparagraph (b)(3)(ii)of this section.
(c)
Approach.The stickforce curve musthave a stable slope at speedsbetween[VSW], and[1.7 VSR1 ], with–

(1)
Wing .apsintheapproachposition;

(2)
Landing gear retracted;

(3)
Maximum landing weight; and

(4)
The airplane trimmed at[1.3 VSR1],withenoughpowertomaintainlevel.ight at this speed.

(d)
Landing. The stick force curve must have a stable slope, and the stick force may not exceed80pounds, at speedsbetween[VSW]and[1.7 VSRO]with–

(1)
Wing .aps in the landing position;

(2)
Landinggear extended;

(3)
Maximum landing weight;

(4)
Power or thrust o. on the engines; and

(5)
The airplanetrimmed at[1.3 VSRO]with power or thrust o.. Amdt. 25-108, E.. 12/26/2002

FAR 25.177 : Static lateral-directional stability.
(a)
[Reserved.]

(b)
[Reserved.]

(c)
In straight, steady sideslips, the aileron and rudder control movements and forces mustbe substantiallyproportionalto the angle of sideslipin a stable sense; and the factorofproportionality mustliebetweenlimitsfound necessaryfor safeoperation throughout the range of sideslip angles appropriate to the operation of the airplane. At greater angles, up to the angle at which full rudder is used or a rudder force of 180 pounds is obtained, the rudder pedal forces may not reverse; and increa-sed rudder de.ection must be needed for increased angles of sideslip. Compliance with this paragraph must be demonstrated for all landing gear and .ap positions and symmetrical power conditions at speeds from [1.13 VSR1 ] to VFE, VLE, or VFC/MFC , as appropriate.

(d)
The ruddergradients must meet the requirements ofparagraph(c) at speedsbet-ween VMO/MMO and VFC/MFC exceptthatthedihedral e.ect(aileronde.ection oppositethe corresponding rudderinput) maybe negativeprovided thedivergence is gradual, easily recognized, and easily controlled by the pilot.

Amdt. 25-108, E.. 12/26/2002
FAR 25.181 : Dynamic stability.
(a)
Any shortperiod oscillation, notincluding combinedlateral-directional oscillations, occurring between [1.13 VSR] and maximum allowable speed appropriate to the con.guration of the airplane must be heavily damped with the primary controls–

(1)
Free; and

(2)
In a .xed position.

(b)
Any combined lateral-directional oscillations(“Dutch roll”) occurringbetween[1.13 VSR]and maximum allowable speed appropriateto the con.guration ofthe airplane mustbepositivelydamped with controlsfree, and mustbe controllable with normal use of the primary controls without requiring exceptional pilot skill.

Amdt. 25-108, E.. 12/26/2002
45.6 Stalls
FAR 25.201 : Stall demonstration.
(a)
Stalls must be shown in straight .ight and in 30 degree banked turns with–

(1)
Power o.; and

(2)
[The power necessary to maintain level .ight at 1.5 VSR1 (where VSR1 cor-responds to the reference stall at maximum landing weight with .aps in the approachposition andthelandinggear retracted).]

(b)
Ineach conditionrequiredbyparagraph(a) ofthis section,itmustbepossibleto meet the applicable requirements of Sec. 25.203 with–

(1)
Flaps, landing gear, and deceleration devices in any likely combination of po-sitions approved for operation;

(2)
Representative weights within the range for which certi.cation is requested;

′
Elodie Roux. Septembre 2003
Subpart B : Flight
(3)
The most adverse center of gravity for recovery; and

(4)
[The airplanetrimmedfor straight.ightatthe speedprescribedinSec.25.103(b)(6).]
　
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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 3(38)