[Code of Federal Regulations]

[Title 14, Volume 1]

[Revised as of January 1, 2006]

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

[CITE: 14CFR33.77]



[Page 784]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

 

PART 33_AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES--Table of Contents

 

       Subpart E_Design and Construction; Turbine Aircraft Engines

 

Sec. 33.77  Foreign object ingestion--ice.



    (a)-(b) [Reserved]

    (c) Ingestion of ice under the conditions of paragraph (e) of this 

section may not--

    (1) Cause a sustained power or thrust loss; or

    (2) Require the engine to be shutdown.

    (d) For an engine that incorporates a protection device, compliance 

with this section need not be demonstrated with respect to foreign 

objects to be ingested under the conditions prescribed in paragraph (e) 

of this section if it is shown that--

    (1) Such foreign objects are of a size that will not pass through 

the protective device;

    (2) The protective device will withstand the impact of the foreign 

objects; and

    (3) The foreign object, or objects, stopped by the protective device 

will not obstruct the flow of induction air into the engine with a 

resultant sustained reduction in power or thrust greater than those 

values required by paragraph (c) of this section.

    (e) Compliance with paragraph (c) of this section must be shown by 

engine test under the following ingestion conditions:

    (1) Ice quantity will be the maximum accumulation on a typical inlet 

cowl and engine face resulting from a 2-minute delay in actuating the 

anti-icing system; or a slab of ice which is comparable in weight or 

thickness for that size engine.

    (2) The ingestion velocity will simulate ice being sucked into the 

engine inlet.

    (3) Engine operation will be maximum cruise power or thrust.

    (4) The ingestion will simulate a continuous maximum icing encounter 

at 25 degrees Fahrenheit.



[Doc. No. 16919, 49 FR 6852, Feb. 23, 1984, as amended by Amdt. 33-19, 

63 FR 14798, Mar. 26, 1998; 63 FR 53278, Oct. 5, 1998; Amdt. 33-20, 65 

FR 55856, Sept. 14, 2000]