(3)
In addition, except for rotorcraft engines, it must also be substantiated by appropriate tests or analysis or both, that when the full fan assembly is sub-jected to the ingestion of the quantityand weights of birds from (Table 92.3,

p. 1156), aimed at the fan assembly’s most critical location outboard of the primary core .owpath, and in accordance with the applicable test conditions of this paragraph, that the engine can comply with the acceptance criteria of this paragraph.

(4)
A smallbirdingestiontestisnot requiredif theprescribed numberof medium birds pass into the engine rotor blades during the medium bird test.

(5)
Smallbirdingestiontestsshallbeconductedsoastosimulatea .ock encounter using one85gram(0.187lb.) birdfor each0.032 square-meter(49.6 square-inches) of inlet area, or fraction thereof, up to a maximum of 16 birds. The birds will be aimed so as to account for any critical exposed locations on the .rst stage rotor blades, with any remaining birds evenly distributed over the engine face area.

(6)
Ingestionof small and mediumbirdstested underthe conditionsprescribedin this paragraph may not cause any of the following :

(i)
Morethan a sustained25-percentpower orthrustloss;

(ii)
The engine to be shut down during the required run-on demonstration prescribedinparagraphs(c)(7) or(c)(8) of this section;

(iii) The conditionsde.nedinparagraph(b)(3) of this section.
(iv) Unacceptable deterioration of engine handling characteristics.
(7)
Except for rotorcraft engines, the following test schedule shall be used :

(i)
Ingestionsoastosimulatea .ock encounter,with approximately1 second elapsed time from the moment of the .rst bird ingestion to the last.

(ii)
Followedby2 minutes withoutpowerlever movement after the ingestion.

(iii) Followed by 3 minutes at 75-percent of the test condition.
(iv)
Followed by 6 minutes at 60-percent of the test condition.

(v)
Followed by 6 minutes at 40-percent of the test condition.

(vi)
Followed by 1 minute at approach idle.

(vii) Followed by 2 minutes at 75-percent of the test condition.
(viii) Followed by stabilizing at idle and engine shut down. The durations speci.ed are times at the de.ned conditions with the power lever being moved between each condition in less than 10 seconds.

(8)
For rotorcraft engines, the following test schedule shall be used :

(i)
Ingestionsoastosimulatea .ockencounterwithinapproximately1 second elapsed time between the .rst ingestion and the last.

(ii)
Followed by 3 minutes at 75-percent of the test condition.

(iii) Followed by 90 seconds at descent .ight idle.
(iv)
Followed by 30 seconds at 75-percent of the test condition.

(v)
Followed by stabilizing at idle and engine shut down. The duration spe-ci.ed are times at the de.ned conditions with the power being changed between each condition in less than 10 seconds.

(9)
Engines intended for use in multi-engine rotorcraft are not required to comply with the medium bird ingestion portion of this section, providing that the appropriate type certi.cate documentation is so endorsed.

(10)
If any engine operating limit(s) is exceeded during the initial 2 minutes wi-thoutpowerlever movement, asprovidedbyparagraph(c)(7)(ii) ofthis sec-tion, then it shall be established that the limit exceedence will not result in an unsafe condition.

Amdt. 33-20, E.. 12/13/2000
FAR33.77 :[Foreign objectingestion–ice.]
(a)
[[Reserved]

(b)
[Reserved]

(c)
Ingestion ofice underthe conditions ofparagraph(e) of this section may not–

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

(2)
Require the engine to be shutdown.
　
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