[Code of Federal Regulations]

[Title 14, Volume 2]

[Revised as of January 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 14CFR121.193]



[Page 442-443]

 

                     TITLE 14--AERONAUTICS AND 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.

    (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



[[Page 443]]



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.