Federal Aviation Administration, DOT

Section 135.377

Section 135.373 Part 25 transport category
airplanes with four or more engines: Reciprocating engine powered: En route limitations: Two engines inoperative.
(a) No person may operate an airplane certificated under part 25 and
having four or more engines unless - 
(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 135.377; or
(2) It is operated at a weight allowing
the airplane, with the two critical engines inoperative, to climb at 0.013 Vso2
feet per minute (that is, the number of
feet per minute obtained by multiplying the number of knots squared by
0.013) at an altitude of 1,000 feet above
the highest ground or obstruction
within 10 miles on each side of the intended track, or at an altitude of 5,000
feet, whichever is higher.
(b) For the purposes of paragraph
(a)(2) of this section, it is assumed
that - 
(1) The two engines fail at the point
that is most critical with respect to
the takeoff weight;
(2) Consumption of fuel and oil is normal with all engines operating up to
the point where the two engines fail
with two engines operating beyond
that point;
(3) Where the engines are assumed to
fail at an altitude above the prescribed
minimum altitude, compliance with
the prescribed rate of climb at the prescribed minimum altitude need not be
shown during the descent from the
cruising altitude to the prescribed minimum altitude, if those requirements
can be met once the prescribed minimum altitude is reached, and assuming descent to be along a net flight
path and the rate of descent to be 0.013
Vso2 greater than the rate in the approved performance data; and
(4) If fuel jettisoning is provided, the
airplane-s weight at the point where
the two engines fail is considered to be
not less than that which would include
enough fuel to proceed to an airport
meeting Section 135.377 and to arrive at an altitude of at least 1,000 feet directly
over that airport.

Section 135.375 Large transport category airplanes: Reciprocating engine powered: Landing limitations: Destination airports.
(a) Except as provided in paragraph
(b) of this section, no person operating
a reciprocating engine powered large
transport category airplane may take
off that airplane, unless its weight on
arrival, allowing for normal consumption of fuel and oil in flight, would
allow a full stop landing at the intended destination within 60 percent of
the effective length of each runway described below from a point 50 feet directly above the intersection of the obstruction clearance plane and the runway. For the purposes of determining
the allowable landing weight at the
destination airport the following is assumed:
(1) The airplane is landed on the most
favorable runway and in the most favorable direction in still air.
(2) The airplane is landed on the most
suitable runway considering the probable wind velocity and direction (forecast for the expected time of arrival),
the ground handling characteristics of
the type of airplane, and other conditions such as landing aids and terrain,
and allowing for the effect of the landing path and roll of not more than 50
percent of the headwind component or
not less than 150 percent of the tailwind component.
(b) An airplane that would be prohibited from being taken off because it
could not meet paragraph (a)(2) of this
section may be taken off if an alternate airport is selected that meets all
of this section except that the airplane
can accomplish a full stop landing
within 70 percent of the effective
length of the runway.
Section 135.377 Large transport category airplanes: Reciprocating engine powered: Landing limitations: Alternate
airports.
No person may list an airport as an
alternate airport in a flight plan unless
the airplane (at the weight anticipated
at the time of arrival at the airport),
based on the assumptions in Section 135.375(a)
(1) and (2), can be brought to a full stop
landing within 70 percent of the effective length of the runway.

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