spaschal on DSK3GDR082PROD with CFR

Section 33.87

14 CFR Ch. I (1-1-19 Edition)

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.
(c) Rotorcraft engines for which a 30minute OEI power rating is desired. For
each rotorcraft engine for which a 30minute OEI power rating is desired, the
applicant must conduct the following
series of tests:
(1) Takeoff and idling. One hour of alternate 5-minute periods at rated takeoff power and at idling power. The developed powers at takeoff 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.
During any one period, the rotor speed
and power may be controlled manually
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 (c)(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 maximum continuous power.
One hour at rated maximum continuous power.
(4) Rated 30-minute OEI power. Thirty
minutes at rated 30-minute OEI power.
(5) Incremental cruise power. Two
hours and 30 minutes at the successive
power lever positions corresponding
with not less than 15 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 subject to 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 one second. If, however, different regimes of control operations
are incorporated that necessitate
scheduling of the power control lever
motion from one extreme position to
the other, then a longer period of time
is acceptable, but not more than two
seconds.
(7) Starts. One hundred starts, of
which 25 starts must be preceded by at
least a two-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 not
more than 15 minutes after engine
shutdown. The remaining starts may
be made after completing the 150 hours
of endurance testing.
(d) Rotorcraft engines for which a continuous OEI rating is desired. For each
rotorcraft engine for which a continuous OEI power rating is desired, the
applicant must conduct the following
series of tests:
(1) Takeoff and idling. One hour of alternate 5-minute periods at rated takeoff power and at idling power. The developed powers at takeoff 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.
During any one period the rotor speed
and power may be controlled manually

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