spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 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 leading 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 maximum rated takeoff power or thrust
during the run-on segment specified
under paragraph (d)(5)(i) of this section.
(ii) Engine shutdown during the required run-on demonstration specified
in paragraph (d)(5) of this section.
(iii) The conditions specified in paragraph (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 condition will be 10 seconds or less, except
that power lever movements allowed
within paragraph (d)(5)(ii) of this section 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 flocking bird ingestion requirements of this
paragraph (d) may also be demonstrated 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 complying with the requirements of paragraph (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 section; except that section (d)(5)(i) is deleted 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 engine 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 unsafe condition will not result if any engine operating limit is exceeded during
the run-on period.
TABLE 4 TO Section 33.76 - LARGE FLOCKING BIRD
MASS AND WEIGHT
Engine inlet throat area
(square meters/square inches)
A <2.50 (3875) ................................
2.50 (3875) -A <3.50 (5425) ...........
3.50 (5425) -A <3.90 (6045) ...........
3.90 (6045) -A .................................

Bird
quantity
none
1
1
1

12:50 Apr 30, 2019

Jkt 247046

PO 00000

Frm 00733

Fmt 8010

1.85 (4.08)
2.10 (4.63)
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]

Section 33.77

Foreign object ingestion - ice.

(a) Compliance with the requirements of this section must be demonstrated by engine ice ingestion test
or by validated analysis showing
equivalence of other means for demonstrating soft body damage tolerance.
(b) [Reserved]
(c) Ingestion of ice under the conditions of this section may not - 
(1) Cause an immediate or ultimate
unacceptable sustained power or thrust
loss; or

723

VerDate Sep<11>2014

Bird mass
and weight
(kg (lbs))

Sfmt 8010

Y:\SGML\247046.XXX

247046