[Code of Federal Regulations]

[Title 14, Volume 1]

[Revised as of January 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 14CFR25.125]



[Page 356-357]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

 

PART 25_AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES--Table 

of Contents

 

                            Subpart B_Flight

 

Sec. 25.125  Landing.



    (a) The horizontal distance necessary to land and to come to a 

complete stop (or to a speed of approximately 3 knots



[[Page 357]]



for water landings) from a point 50 feet above the landing surface must 

be determined (for standard temperatures, at each weight, altitude, and 

wind within the operational limits established by the applicant for the 

airplane) as follows:

    (1) The airplane must be in the landing configuration.

    (2) A stabilized approach, with a calibrated airspeed of VREF, must 

be maintained down to the 50 foot height. VREF may not be less than

    (i) 1.23 VSR0;

    (ii) VMCL established under Sec. 25.149(f); and

    (iii) A speed that provides the maneuvering capability specified in 

Sec. 25.143(g).

    (3) Changes in configuration, power or thrust, and speed, must be 

made in accordance with the established procedures for service 

operation.

    (4) The landing must be made without excessive vertical 

acceleration, tendency to bounce, nose over, ground loop, porpoise, or 

water loop.

    (5) The landings may not require exceptional piloting skill or 

alertness.

    (b) For landplanes and amphibians, the landing distance on land must 

be determined on a level, smooth, dry, hard-surfaced runway. In 

addition--

    (1) The pressures on the wheel braking systems may not exceed those 

specified by the brake manufacturer;

    (2) The brakes may not be used so as to cause excessive wear of 

brakes or tires; and

    (3) Means other than wheel brakes may be used if that means--

    (i) Is safe and reliable;

    (ii) Is used so that consistent results can be expected in service; 

and

    (iii) Is such that exceptional skill is not required to control the 

airplane.

    (c) For seaplanes and amphibians, the landing distance on water must 

be determined on smooth water.

    (d) For skiplanes, the landing distance on snow must be determined 

on smooth, dry, snow.

    (e) The landing distance data must include correction factors for 

not more than 50 percent of the nominal wind components along the 

landing path opposite to the direction of landing, and not less than 150 

percent of the nominal wind components along the landing path in the 

direction of landing.

    (f) If any device is used that depends on the operation of any 

engine, and if the landing distance would be noticeably increased when a 

landing is made with that engine inoperative, the landing distance must 

be determined with that engine inoperative unless the use of 

compensating means will result in a landing distance not more than that 

with each engine operating.



Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-72, 55 

FR 29774, July 20, 1990; Amdt. 25-84, 60 FR 30749, June 9, 1995; Amdt. 

25-108, 67 FR 70826, Nov. 26, 2002]



                   Controllability and Maneuverability