102 

14 CFR Ch. I (1–1–24 Edition) 

§ 121.193 

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. 

(b) 

Aircraft certificated after September 

30, 1958, but before August 30, 1959 

(SR 

422A). 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 

103 

Federal Aviation Administration, DOT 

§ 121.195 

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 temperatures 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 5 miles on each side of the 
intended track, or at an altitude of 
2,000 feet, whichever is higher. 

For the purposes 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 thereafter 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 

(SR 422B). No person may operate 

a turbine engine powered airplane 
along an intended route unless he 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 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 the net flight path (con-
sidering the ambient temperatures an-
ticipated along the track) clearing 
vertically by at least 2,000 feet all ter-
rain and obstructions within five stat-
ute miles (4.34 nautical miles) on each 
side of the intended track. For the pur-
poses of this subparagraph, it is as-
sumed 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 thereafter to fly 
for 15 minutes at cruise power or 
thrust, or both; and 

(v) The consumption of fuel and oil 

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

§ 121.195 Airplanes: Turbine engine 

powered: Landing limitations: Des-
tination airports. 

(a) No person operating a turbine en-

gine powered airplane may take off 
that airplane at such a weight that (al-
lowing for normal consumption of fuel 
and oil in flight to the destination or 
alternate airport) the weight of the air-
plane on arrival would exceed the land-
ing weight set forth in the Airplane 
Flight Manual for the elevation of the 
destination or alternate airport and 
the ambient temperature anticipated 
at the time of landing. 

(b) Except as provided in paragraph 

(c), (d), or (e) of this section, no person 
operating a turbine engine powered air-
plane may take off that airplane unless 
its weight on arrival, allowing for nor-
mal consumption of fuel and oil in 
flight (in accordance with the landing 
distance set forth in the Airplane 
Flight Manual for the elevation of the 
destination airport and the wind condi-
tions anticipated there at the time of 
landing), would allow a full stop land-
ing at the intended destination airport 
within 60 percent of the effective 
length of each runway described below 
from a point 50 feet above the intersec-
tion of the obstruction clearance plane