723 

Federal Aviation Administration, DOT 

§ 33.77 

the sea level static maximum rated 
takeoff power or thrust. 

(3) The bird must be targeted on the 

first exposed rotating stage or stages 
at a blade airfoil height of not less 
than 50 percent measured at the lead-
ing edge. 

(4) Ingestion of a large flocking bird 

under the conditions prescribed in this 
paragraph must not cause any of the 
following: 

(i) A sustained reduction of power or 

thrust to less than 50 percent of max-
imum rated takeoff power or thrust 
during the run-on segment specified 
under paragraph (d)(5)(i) of this sec-
tion. 

(ii) Engine shutdown during the re-

quired run-on demonstration specified 
in paragraph (d)(5) of this section. 

(iii) The conditions specified in para-

graph (b)(3) of this section. 

(5) The following test schedule must 

be used: 

(i) Ingestion followed by 1 minute 

without power lever movement. 

(ii) Followed by 13 minutes at not 

less than 50 percent of maximum rated 
takeoff power or thrust. 

(iii) Followed by 2 minutes between 

30 and 35 percent of maximum rated 
takeoff power or thrust. 

(iv) Followed by 1 minute with power 

or thrust increased from that set in 
paragraph (d)(5)(iii) of this section, by 
between 5 and 10 percent of maximum 
rated takeoff power or thrust. 

(v) Followed by 2 minutes with power 

or thrust reduced from that set in 
paragraph (d)(5)(iv) of this section, by 
between 5 and 10 percent of maximum 
rated takeoff power or thrust. 

(vi) Followed by a minimum of 1 

minute at ground idle then engine 
shutdown. The durations specified are 
times at the defined conditions. Power 
lever movement between each condi-
tion will be 10 seconds or less, except 
that power lever movements allowed 
within paragraph (d)(5)(ii) of this sec-
tion are not limited, and for setting 
power under paragraph (d)(5)(iii) of this 
section will be 30 seconds or less. 

(6) Compliance with the large flock-

ing bird ingestion requirements of this 
paragraph (d) may also be dem-
onstrated by: 

(i) Incorporating the requirements of 

paragraph (d)(4) and (d)(5) of this sec-

tion, into the large single bird test 
demonstration specified in paragraph 
(b)(1) of this section; or 

(ii) Use of an engine subassembly test 

at the ingestion conditions specified in 
paragraph (b)(1) of this section if: 

(A) All components critical to com-

plying with the requirements of para-
graph (d) of this section are included in 
the subassembly test; 

(B) The components of paragraph 

(d)(6)(ii)(A) of this section are installed 
in a representative engine for a run-on 
demonstration in accordance with 
paragraphs (d)(4) and (d)(5) of this sec-
tion; except that section (d)(5)(i) is de-
leted and section (d)(5)(ii) must be 14 
minutes in duration after the engine is 
started and stabilized; and 

(C) The dynamic effects that would 

have been experienced during a full en-
gine ingestion test can be shown to be 
negligible with respect to meeting the 
requirements of paragraphs (d)(4) and 
(d)(5) of this section. 

(7) Applicants must show that an un-

safe condition will not result if any en-
gine operating limit is exceeded during 
the run-on period. 

T

ABLE

4 

TO

§ 33.76—L

ARGE

F

LOCKING

B

IRD

 

M

ASS AND

W

EIGHT

 

Engine inlet throat area 

(square meters/square inches) 

Bird 

quan-

tity 

Bird mass 

and weight 

(kg (lbs)) 

A <2.50 (3875) ................................

none 

2.50 (3875) 

≤

A <3.50 (5425) ...........

1 

1.85 (4.08) 

3.50 (5425) 

≤

A <3.90 (6045) ...........

1 

2.10 (4.63) 

3.90 (6045) 

≤

A .................................

1 2.50 

(5.51) 

[Doc. No. FAA–1998–4815, 65 FR 55854, Sept. 
14, 2000, as amended by Amdt. 33–20, 68 FR 
75391, Dec. 31, 2003; Amdt. 33–24, 72 FR 50868, 
Sept. 4, 2007; Amdt. 33–23, 72 FR 58974, Oct. 17, 
2007] 

§ 33.77

Foreign object ingestion—ice. 

(a) Compliance with the require-

ments of this section must be dem-
onstrated by engine ice ingestion test 
or by validated analysis showing 
equivalence of other means for dem-
onstrating soft body damage tolerance. 

(b) [Reserved] 
(c) Ingestion of ice under the condi-

tions of this section may not— 

(1) Cause an immediate or ultimate 

unacceptable sustained power or thrust 
loss; or 

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