[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR135.373]
[Page 1140]
TITLE 14--AERONAUTICS AND SPACE
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
(CONTINUED)
PART 135_OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES
Subpart I_Airplane Performance Operating Limitations
Sec. 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 Sec. 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 Sec.
135.377 and to arrive at an altitude of at least 1,000 feet directly
over that airport.