Federal Aviation Administration, DOT

Section 135.383

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, 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 airplane to continue flight from the cruising altitude to an airport where a landing can be made under Section 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 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 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 ensure a safe procedure;
(5) The alternate airport is selected
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.
[Doc. No. 16097, 43 FR 46783, Oct. 10, 1978, as
amended by Amdt. 135-110, 72 FR 31685, June
7, 2007]

Section 135.383 Large transport category airplanes: Turbine engine powered: En
route limitations: Two engines inoperative.
(a) Airplanes certificated after August 26, 1957, but before October 1, 1958
(SR422). 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 intended track that is more than 90 minutes (with all engines operating at
cruising power) from an airport that
meets Section 135.387.
(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 Section 135.387, 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
statute 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.
(b) Airplanes certificated after September 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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