[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR33.77]

[Page 775]
 
                     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]