503 

Federal Aviation Administration, DOT 

§ 135.383 

overlay, and that the operator deter-
mines are designed, constructed, and 
maintained in a manner acceptable to 
the Administrator. 

(f) For the purposes of this section, it 

is assumed that the airplane is not 
banked before reaching a height of 50 
feet, as shown by the takeoff path or 
net takeoff flight path data (as appro-
priate) in the Airplane Flight Manual, 
and after that the maximum bank is 
not more than 15 degrees. 

(g) For the purposes of this section, 

the terms, 

takeoff distance, takeoff run, 

net takeoff flight path, 

have the same 

meanings as set forth in the rules 
under which the airplane was certifi-
cated. 

[Doc. No. 16097, 43 FR 46783, Oct. 10, 1978, as 
amended by Amdt. 135–71, 63 FR 8321, Feb. 18, 
1998] 

§ 135.381 Large transport category air-

planes: Turbine engine powered: En 

route limitations: One engine inop-

erative. 

(a) No person operating a turbine en-

gine powered large transport category 
airplane may take off that airplane at 
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 

504 

14 CFR Ch. I (1–1–24 Edition) 

§ 135.383 

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: 

(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 
temperatures 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 2,000 
feet, whichever is higher. 

For the purpose of paragraph (b)(2) of 
this section, it is assumed that the two 
engines fail at the most critical point 
en route, that the airplane’s weight at 
the point where the engines fail in-
cludes enough fuel to continue to the 
airport, to arrive at an altitude of at 
least 1,500 feet directly over the air-
port, and after that to fly for 15 min-
utes at cruise power or thrust, or both, 

and that the consumption of fuel and 
oil after engine failure is the same as 
the consumption allowed for in the net 
flight path data in the Airplane Flight 
Manual. 

(c) Aircraft certificated after August 

29, 1959 (SR422B). No person may oper-
ate a turbine engine powered large 
transport category airplane along an 
intended route unless that person com-
plies 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 the net 
flight path (considering the ambient 
temperatures anticipated along the 
track) clearing vertically by at least 
2,000 feet all terrain and obstructions 
within five statute miles on each side 
of the intended track. For the purposes 
of this paragraph, it is assumed that— 

(i) The two engines fail at the most 

critical point en route; 

(ii) The net flight path has a positive 

slope at 1,500 feet above the airport 
where the landing is assumed to be 
made after the engines fail; 

(iii) Fuel jettisoning will be approved 

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; 

(iv) The airplane’s weight at the 

point where the two engines are as-
sumed to fail provides enough fuel to 
continue to the airport, to arrive at an 
altitude of at least 1,500 feet directly 
over the airport, and after that to fly 
for 15 minutes at cruise power or 
thrust, or both; and 

(v) The consumption of fuel and oil 

after the engines fail is the same as the 
consumption that is allowed for in the 
net flight path data in the Airplane 
Flight Manual.