90 

14 CFR Ch. I (1–1–19 Edition) 

§ 121.191 

§ 121.191

Airplanes: Turbine engine 

powered: En route limitations: One 
engine inoperative. 

(a) No person operating a turbine en-

gine powered airplane may take off 
that airplane at a weight, allowing for 
normal consumption 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 air-
plane) will allow compliance with para-
graph (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, 1959 (SR 422B) 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 § 121.197, clear-
ing 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 air-
plane was certificated after September 
30, 1958 (SR 422A, 422B), with a positive 
slope at 1,500 feet above the airport 
where the airplane lands after an en-
gine fails. 

(b) For the purposes 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 nearest approved radio 
navigation fix, unless the Adminis-
trator authorizes a different procedure 
based on adequate operational safe-
guards; 

(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 in-
sure a safe procedure; 

(5) The alternate airport is specified 

in the dispatch or flight release 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. 6258, 29 FR 19198, Dec. 31, 1964; 30 
FR 130, Jan. 7, 1965, as amended by Amdt. 
121–143, 43 FR 22641, May 25, 1978] 

§ 121.193

Airplanes: Turbine engine 

powered: En route limitations: Two 
engines inoperative. 

(a) 

Airplanes certificated after August 

26, 1957, but before October 1, 1958 

(SR 

422). No person may operate a turbine 
engine powered airplane along an in-
tended route unless he 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 the requirements of § 121.197. 

(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 the requirements of 
§ 121.197, with a net flight path (consid-
ering the ambient temperature antici-
pated along the track) having a posi-
tive slope at an altitude of at least 
1,000 feet above all terrain and obstruc-
tions within five miles on each side of 
the intended 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. 

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