[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR121.193]

[Page 367-368]
 
                     TITLE 14--AERONAUTICSAND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 121--OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL
 OPERATIONS--Table of Contents
 
          Subpart I--Airplane Performance Operating Limitations
 
Sec. 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 Sec. 121.197.
    (2) Its weight, according to the two-engine-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 
Sec. 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.

[[Page 368]]

    (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 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 Sec. 121.197.
    (2) Its weight, according to the two-engine-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 
Sec. 121.197, with a net flight path (considering the ambient 
temperatures anticipated along the track) having a positive slope at an 
altitude of at least 1,000 feet above all terrain and obstructions 
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 includes 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 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 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 Sec. 121.197.
    (2) Its weight, according to the two-engine 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 
Sec. 121.197, with the net flight path (considering the ambient 
temperatures anticipated along the track) clearing vertically by at 
least 2,000 feet all terrain and obstructions within five statute miles 
(4.34 nautical miles) on each side of the intended track. For the 
purposes of this subparagraph, it is assumed 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 ensure a safe 
procedure;
    (iv) The airplane's weight at the point where the two engines are 
assumed 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.