491 

Federal Aviation Administration, DOT 

§ 135.383 

a weight, allowing for normal con-
sumption of fuel and oil, that is greater 
than that which (under the approved, 
one engine inoperative, en route net 
flight path data in the Airplane Flight 
Manual for that airplane) will allow 
compliance with paragraph (a) (1) or (2) 
of this section, based on the ambient 
temperatures expected en route. 

(1) There is a positive slope at an al-

titude of at least 1,000 feet above all 
terrain and obstructions within five 
statute miles on each side of the in-
tended track, and, in addition, if that 
airplane was certificated after August 
29, 1958 (SR422B), there is a positive 
slope at 1,500 feet above the airport 
where the airplane is assumed to land 
after an engine fails. 

(2) The net flight path allows the air-

plane to continue flight from the cruis-
ing altitude to an airport where a land-
ing can be made under § 135.387 clearing 
all terrain and obstructions within five 
statute miles of the intended track by 
at least 2,000 feet vertically and with a 
positive slope at 1,000 feet above the 
airport where the airplane lands after 
an engine fails, or, if that airplane was 
certificated after September 30, 1958 
(SR422A, 422B), with a positive slope at 
1,500 feet above the airport where the 
airplane lands after an engine fails. 

(b) For the purpose of paragraph 

(a)(2) of this section, it is assumed 
that— 

(1) The engine fails at the most crit-

ical point en route; 

(2) The airplane passes over the crit-

ical obstruction, after engine failure at 
a point that is no closer to the obstruc-
tion than the approved navigation fix, 
unless the Administrator authorizes a 
different procedure based on adequate 
operational safeguards; 

(3) An approved method is used to 

allow for adverse winds; 

(4) Fuel jettisoning will be allowed if 

the certificate holder shows that the 
crew is properly instructed, that the 
training program is adequate, and that 
all other precautions are taken to en-
sure a safe procedure; 

(5) The alternate airport is selected 

and meets the prescribed weather mini-
mums; and 

(6) The consumption of fuel and oil 

after engine failure is the same as the 
consumption that is allowed for in the 

approved net flight path data in the 
Airplane Flight Manual. 

[Doc. No. 16097, 43 FR 46783, Oct. 10, 1978, as 
amended by Amdt. 135–110, 72 FR 31685, June 
7, 2007] 

§ 135.383

Large transport category air-

planes: Turbine engine powered: En 
route limitations: Two engines inop-
erative. 

(a) Airplanes certificated after Au-

gust 26, 1957, but before October 1, 1958 
(SR422). No person may operate a tur-
bine engine powered large transport 
category airplane along an intended 
route unless that person complies with 
either of the following: 

(1) There is no place along the in-

tended track that is more than 90 min-
utes (with all engines operating at 
cruising power) from an airport that 
meets § 135.387. 

(2) Its weight, according to the two- 

engine-inoperative, en route, net flight 
path data in the Airplane Flight Man-
ual, allows the airplane to fly from the 
point where the two engines are as-
sumed to fail simultaneously to an air-
port that meets § 135.387, with a net 
flight path (considering the ambient 
temperature anticipated along the 
track) having a positive slope at an al-
titude of at least 1,000 feet above all 
terrain and obstructions within five 
statute miles on each side of the in-
tended track, or at an altitude of 5,000 
feet, whichever is higher. 

For the purposes of paragraph (a)(2) of 
this section, it is assumed that the two 
engines fail at the most critical point 
en route, that if fuel jettisoning is pro-
vided, the airplane’s weight at the 
point where the engines fail includes 
enough fuel to continue to the airport 
and to arrive at an altitude of at least 
1,000 feet directly over the airport, and 
that the fuel and oil consumption after 
engine failure is the same as the con-
sumption allowed for in the net flight 
path data in the Airplane Flight Man-
ual. 

(b) Airplanes certificated after Sep-

tember 30, 1958, but before August 30, 
1959 (SR422A). No person may operate a 
turbine engine powered large transport 
category airplane along an intended 
route unless that person complies with 
either of the following: 

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