§ 25.1503 14 CFR Ch. I (1–1–12 Edition)

OPERATING LIMITATIONS gear, as determined under § 25.729 or by flight characteristics. If the extension § 25.1503 Airspeed limitations: general. speed is not the same as the retraction When airspeed limitations are a func- speed, the two speeds must be des- tion of weight, weight distribution, al- ignated as VLO(EXT) and VLO(RET), re- titude, or Mach number, limitations spectively. corresponding to each critical com- (b) The established landing gear ex- bination of these factors must be estab- tended speed VLE may not exceed the lished. speed at which it is safe to fly with the landing gear secured in the fully ex- § 25.1505 Maximum operating limit tended position, and that determined speed. under § 25.729. The maximum operating limit speed [Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as (VMO/MMO airspeed or Mach Number, amended by Amdt. 25–38, 41 FR 55468, Dec. 20, whichever is critical at a particular al- 1976] titude) is a speed that may not be de- liberately exceeded in any regime of § 25.1516 Other speed limitations. flight (climb, cruise, or descent), unless Any other limitation associated with a higher speed is authorized for flight speed must be established. test or pilot training operations. V / MO [Doc. No. 2000–8511, 66 FR 34024, June 26, 2001] MMO must be established so that it is not greater than the design cruising § 25.1517 Rough air speed, VRA. speed V and so that it is sufficiently C A rough air speed, V , for use as the below V /M or V /M to make it RA D D DF DF, recommended turbulence penetration highly improbable that the latter airspeed in § 25.1585(a)(8), must be es- speeds will be inadvertently exceeded tablished, which— in operations. The speed margin be- (1) Is not greater than the design air- tween V /M and V /M or V M/ MO MO D D DF DF speed for maximum gust intensity, se- may not be less than that determined lected for V ; and under § 25.335(b) or found necessary dur- B (2) Is not less than the minimum ing the flight tests conducted under value of V specified in § 25.335(d); and § 25.253. B (3) Is sufficiently less than VMO to en- [Amdt. 25–23, 35 FR 5680, Apr. 8, 1970] sure that likely speed variation during rough air encounters will not cause the § 25.1507 Maneuvering speed. overspeed warning to operate too fre- The maneuvering speed must be es- quently. In the absence of a rational tablished so that it does not exceed the investigation substantiating the use of design maneuvering speed VA deter- other values, VRA must be less than mined under § 25.335(c). VMO—35 knots (TAS). [Doc. No. 27902, 61 FR 5222, Feb. 9, 1996] § 25.1511 Flap extended speed. The established flap extended speed § 25.1519 Weight, center of gravity, and VFE must be established so that it does weight distribution. not exceed the design flap speed VF The airplane weight, center of grav- chosen under §§ 25.335(e) and 25.345, for ity, and weight distribution limita- the corresponding flap positions and tions determined under §§ 25.23 through engine powers. 25.27 must be established as operating limitations. § 25.1513 Minimum control speed.

The minimum control speed VMC de- § 25.1521 Powerplant limitations. termined under § 25.149 must be estab- (a) General. The powerplant limita- lished as an operating limitation. tions prescribed in this section must be established so that they do not exceed § 25.1515 Landing gear speeds. the corresponding limits for which the (a) The established landing gear oper- engines or propellers are type certifi- ating speed or speeds, VLO, may not ex- cated and do not exceed the values on ceed the speed at which it is safe both which compliance with any other re- to extend and to retract the landing quirement of this part is based.

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