spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 33.87

while taking data to check performance. For engines with augmented
takeoff power ratings that involve increases in turbine inlet temperature,
rotor speed, or shaft power, this period
of running at rated takeoff power must
be at the augmented power rating. In
changing the power setting after each
period, the power control lever must be
moved in the manner prescribed in
paragraph (d)(6) of this section.
(2) Rated maximum continuous and
takeoff power. Thirty minutes at - 
(i) Rated maximum continuous power
during fifteen of the twenty-five 6-hour
endurance test cycles; and
(ii) Rated takeoff power during ten of
the twenty-five 6-hour endurance test
cycles.
(3) Rated continuous OEI power. One
hour at rated continuous OEI power.
(4) Rated maximum continuous power.
One hour at rated maximum continuous power.
(5) Incremental cruise power. Two
hours at the successive power lever positions corresponding with not less
than 12 approximately equal speed and
time increments between maximum
continuous engine rotational speed and
ground or minimum idle rotational
speed. For engines operating at constant speed, power may be varied in
place of speed. If there are significant
peak vibrations anywhere between
ground idle and maximum continuous
conditions, the number of increments
chosen must be changed to increase the
amount of running conducted while
being subjected to the peak vibrations
up to not more than 50 percent of the
total time spent in incremental running.
(6) Acceleration and deceleration runs.
Thirty minutes of accelerations and decelerations, consisting of six cycles
from idling power to rated takeoff
power and maintained at the takeoff
power lever position for 30 seconds and
at the idling power lever position for
approximately 41-2 minutes. In complying with this paragraph, the power
control lever must be moved from one
extreme position to the other in not
more than 1 second, except that if different regimes of control operations
are incorporated necessitating scheduling of the power control lever motion
in going from one extreme position to

the other, a longer period of time is acceptable, but not more than 2 seconds.
(7) Starts. One hundred starts, of
which 25 starts must be preceded by at
least a 2-hour engine shutdown. There
must be at least 10 false engine starts,
pausing for the applicant-s specified
minimum fuel drainage time, before attempting a normal start. There must
be at least 10 normal restarts with not
longer than 15 minutes since engine
shutdown. The remaining starts may
be made after completing the 150 hours
of endurance testing.
(e) Rotorcraft engines for which a 21-2minute OEI power rating is desired. For
each rotorcraft engine for which a 21-2minute OEI power rating is desired, the
applicant must conduct the following
series of tests:
(1) Takeoff, 21-2-minute OEI, and idling.
One hour of alternate 5-minute periods
at rated takeoff power and at idling
power except that, during the third and
sixth takeoff power periods, only 21-2
minutes need be conducted at rated
takeoff power, and the remaining 21-2
minutes must be conducted at rated
21-2-minute OEI power. The developed
powers at takeoff, 21-2-minute OEI, and
idling conditions and their corresponding rotor speed and gas temperature conditions must be as established by the power control in accordance with the schedule established by
the applicant. The applicant may, during any one period, control manually
the rotor speed and power while taking
data to check performance. For engines
with augmented takeoff power ratings
that involve increases in turbine inlet
temperature, rotor speed, or shaft
power, this period of running at rated
takeoff power must be at the augmented rating. In changing the power
setting after or during each period, the
power control lever must be moved in
the manner prescribed in paragraph
(b)(5), (c)(6), or (d)(6) of this section, as
applicable.
(2) The tests required in paragraphs
(b)(2) through (b)(6), or (c)(2) through
(c)(7), or (d)(2) through (d)(7) of this
section, as applicable, except that in
one of the 6-hour test sequences, the
last 5 minutes of the 30 minutes at
takeoff power test period of paragraph

731

VerDate Sep<11>2014

12:50 Apr 30, 2019

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