[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: 14CFR121.181]



[Page 438-439]

 

                     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. 121.181  Airplanes: Reciprocating engine-powered: En route 

limitations: One engine inoperative.



    (a) Except as provided in paragraph (b) of this section, no person 

operating a reciprocating engine powered airplane may take off that 

airplane at a weight, allowing for normal consumption of fuel and oil, 

that does not allow a rate of climb (in feet per minute), with one 

engine inoperative, of at least



(0.079-0.106/N) Vso2





(where N is the number of engines installed and VSo is expressed in 

knots) at an altitude of at least 1,000 feet above the highest ground or 

obstruction within 10 miles of each side of the intended track. However, 

for the purposes of this paragraph the rate of climb for airplanes 

certificated under part 4a of the Civil Air Regulations is 0.026 Vso2.

    (b) In place of the requirements of paragraph (a) of this section, a 

person



[[Page 439]]



may, under an approved procedure, operate a reciprocating engine powered 

airplane, at an all-engines-operating altitude that allows the airplane 

to continue, after an engine failure, to an alternate airport where a 

landing can be made in accordance with Sec. 121.187, allowing for 

normal consumption of fuel and oil. After the assumed failure, the 

flight path must clear the ground and any obstruction within five miles 

on each side of the intended track by at least 2,000 feet.

    (c) If an approved procedure under paragraph (b) of this section is 

used, the certificate holder shall comply with the following:

    (1) The rate of climb (as prescribed in the Airplane Flight Manual 

for the appropriate weight and altitude) used in calculating the 

airplane's flight path shall be diminished by an amount, in feet per 

minute, equal to



(0.079-0.106/N) Vso2





(when N is the number of engines installed and VSo is 

expressed in knots) for airplanes certificated under part 25 of this 

chapter and by 0.026 Vso2 for airplanes certificated under part 4a of 

the Civil Air Regulations.

    (2) The all-engines-operating altitude shall be sufficient so that 

in the event the critical engine becomes inoperative at any point along 

the route, the flight will be able to proceed to a predetermined 

alternate airport by use of this procedure. In determining the takeoff 

weight, the airplane is assumed to pass over the critical obstruction 

following engine failure at a point no closer to the critical 

obstruction than the nearest approved radio navigational fix, unless the 

Administrator approves a procedure established on a different basis upon 

finding that adequate operational safeguards exist.

    (3) The airplane must meet the provisions of paragraph (a) of this 

section at 1,000 feet above the airport used as an alternate in this 

procedure.

    (4) The procedure must include an approved method of accounting for 

winds and temperatures that would otherwise adversely affect the flight 

path.

    (5) In complying with this procedure fuel jettisoning is allowed if 

the certificate holder shows that it has an adequate training program, 

that proper instructions are given to the flight crew, and all other 

precautions are taken to insure a safe procedure.

    (6) The certificate holder shall specify in the dispatch or flight 

release an alternate airport that meets the requirements of Sec. 

121.625.

    (d) This section does not apply to large nontransport category 

airplanes operated under Sec. 121.173(c).



[Doc. No. 6258, 29 FR 19198, Dec. 31, 1964; 30 FR 130, Jan. 7, 1965, as 

amended by Amdt. 121-251, 60 FR 65928, Dec. 20, 1995]