493 

Federal Aviation Administration, DOT 

§ 135.387 

below from a point 50 feet above the 
intersection of the obstruction clear-
ance plane and the runway. For the 
purpose of determining the allowable 
landing weight at the destination air-
port the following is assumed: 

(1) The airplane is landed on the most 

favorable runway and in the most fa-
vorable direction, in still air. 

(2) The airplane is landed on the most 

suitable runway considering the prob-
able wind velocity and direction and 
the ground handling characteristics of 
the airplane, and considering other 
conditions such as landing aids and ter-
rain. 

(c) A turbopropeller powered airplane 

that would be prohibited from being 
taken off because it could not meet 
paragraph (b)(2) of this section, may be 
taken off if an alternate airport is se-
lected that meets all of this section ex-
cept that the airplane can accomplish a 
full stop landing within 70 percent of 
the effective length of the runway. 

(d) Unless, based on a showing of ac-

tual operating landing techniques on 
wet runways, a shorter landing dis-
tance (but never less than that re-
quired by paragraph (b) of this section) 
has been approved for a specific type 
and model airplane and included in the 
Airplane Flight Manual, no person may 
take off a turbojet airplane when the 
appropriate weather reports or fore-
casts, or any combination of them, in-
dicate that the runways at the destina-
tion airport may be wet or slippery at 
the estimated time of arrival unless 
the effective runway length at the des-
tination airport is at least 115 percent 
of the runway length required under 
paragraph (b) of this section. 

(e) A turbojet airplane that would be 

prohibited from being taken off be-
cause it could not meet paragraph 
(b)(2) of this section may be taken off if 
an alternate airport is selected that 
meets all of paragraph (b) of this sec-
tion. 

(f) An eligible on-demand operator 

may take off a turbine engine powered 
large transport category airplane on an 
on-demand flight if all of the following 
conditions exist: 

(1) The operation is permitted by an 

approved Destination Airport Analysis 
in that person’s operations manual. 

(2) The airplane’s weight on arrival, 

allowing for normal consumption of 
fuel and oil in flight (in accordance 
with the landing distance in the Air-
plane Flight Manual for the elevation 
of the destination airport and the wind 
conditions expected there at the time 
of landing), would allow a full stop 
landing at the intended destination air-
port within 80 percent of the effective 
length of each runway described below 
from a point 50 feet above the intersec-
tion of the obstruction clearance plane 
and the runway. For the purpose of de-
termining the allowable landing weight 
at the destination airport, the fol-
lowing is assumed: 

(i) The airplane is landed on the most 

favorable runway and in the most fa-
vorable direction, in still air. 

(ii) The airplane is landed on the 

most suitable runway considering the 
probable wind velocity and direction 
and the ground handling characteris-
tics of the airplane, and considering 
other conditions such as landing aids 
and terrain. 

(3) The operation is authorized by op-

erations specifications. 

[Doc. No. 16097, 43 FR 46783, Oct. 10, 1978, as 
amended by Amdt. 135–91, 68 FR 54588, Sept. 
17, 2003] 

§ 135.387

Large transport category air-

planes: Turbine engine powered: 
Landing limitations: Alternate air-
ports. 

(a) Except as provided in paragraph 

(b) of this section, no person may se-
lect an airport as an alternate airport 
for a turbine engine powered large 
transport category airplane unless 
(based on the assumptions in 
§ 135.385(b)) that airplane, at the weight 
expected at the time of arrival, can be 
brought to a full stop landing within 70 
percent of the effective length of the 
runway for turbo-propeller-powered 
airplanes and 60 percent of the effec-
tive length of the runway for turbojet 
airplanes, from a point 50 feet above 
the intersection of the obstruction 
clearance plane and the runway. 

(b) Eligible on-demand operators may 

select an airport as an alternate air-
port for a turbine engine powered large 
transport category airplane if (based 
on the assumptions in § 135.385(f)) that 
airplane, at the weight expected at the 

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