Section 121.191

14 CFR Ch. I (1-1-19 Edition)
all other precautions are taken to insure a safe procedure;
(5) The alternate airport is specified
in the dispatch or flight release and
meets the prescribed weather minimums; 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.

Section 121.191 Airplanes: Turbine engine
powered: En route limitations: One
engine inoperative.
(a) No person operating a turbine engine 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 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 altitude of at least 1,000 feet above all
terrain and obstructions within five
statute miles on each side of the intended 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 airplane to continue flight from the cruising altitude to an airport where a landing can be made under Section 121.197, 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 (SR 422A, 422B), with a positive
slope at 1,500 feet above the airport
where the airplane lands after an engine fails.
(b) For the purposes of paragraph
(a)(2) of this section, it is assumed
that - 
(1) The engine fails at the most critical point en route;
(2) The airplane passes over the critical obstruction, after engine failure at
a point that is no closer to the obstruction than the nearest approved radio
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

[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]

Section 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 intended route unless he complies with
either of the following:
(1) There is no place along the intended track that is more than 90 minutes (with all engines operating at
cruising power) from an airport that
meets the requirements of Section 121.197.
(2) Its weight, according to the twoengine-inoperative, en route, net flight
path data in the Airplane Flight Manual, allows the airplane to fly from the
point where the two engines are assumed to fail simultaneously to an airport that meets the requirements of
Section 121.197, with a net flight path (considering the ambient temperature anticipated along the track) having a positive slope at an altitude of at least
1,000 feet above all terrain and obstructions 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 provided, 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 consumption allowed for in the net flight
path data in the Airplane Flight Manual.

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