spaschal on DSK3GDR082PROD with CFR

Section 33.87

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

(b)(2) of this section, or of the 30 minutes at 30-minute OEI power test period of paragraph (c)(4) of this section,
or of the l hour at continuous OEI
power test period of paragraph (d)(3) of
this section, must be run at 21-2-minute
OEI power.
(f) Rotorcraft Engines for which 30-second OEI and 2-minute OEI ratings are desired. For each rotorcraft engine for
which 30-second OEI and 2-minute OEI
power ratings are desired, and following completion of the tests under
paragraphs (b), (c), (d), or (e) of this
section, the applicant may disassemble
the tested engine to the extent necessary to show compliance with the requirements of Section 33.93(a). The tested engine must then be reassembled using
the same parts used during the test
runs of paragraphs (b), (c), (d), or (e) of
this section, except those parts described as consumables in the Instructions for Continued Airworthiness. Additionally, the tests required in paragraphs (f)(1) through (f)(8) of this section must be run continuously. If a
stop occurs during these tests, the interrupted sequence must be repeated
unless the applicant shows that the severity of the test would not be reduced
if it were continued. The applicant
must conduct the following test sequence four times, for a total time of
not less than 120 minutes:
(1) Takeoff power. Three minutes at
rated takeoff power.
(2) 30-second OEI power. Thirty seconds at rated 30-second OEI power.
(3) 2-minute OEI power. Two minutes
at rated 2-minute OEI power.
(4) 30-minute OEI power, continuous
OEI power, or maximum continuous
power. Five minutes at whichever is
the greatest of rated 30-minute OEI
power, rated continuous OEI power, or
rated maximum continuous power, except that, during the first test sequence, this period shall be 65 minutes.
However, where the greatest rated
power is 30-minute OEI power, that
sixty-five minute period shall consist
of 30 minutes at 30-minute OEI power
followed by 35 minutes at whichever is
the greater of continuous OEI power or
maximum continuous power.
(5) 50 percent takeoff power. One
minute at 50 percent takeoff power.

(6) 30-second OEI power. Thirty seconds at rated 30-second OEI power.
(7) 2-minute OEI power. Two minutes
at rated 2-minute OEI power.
(8) Idle. One minute at flight idle.
(g) Supersonic aircraft engines. For
each engine type certificated for use on
supersonic aircraft the applicant must
conduct the following:
(1) Subsonic test under sea level ambient
atmospheric conditions. Thirty runs of
one hour each must be made, consisting of - 
(i) Two periods of 5 minutes at rated
takeoff augmented thrust each followed by 5 minutes at idle thrust;
(ii) One period of 5 minutes at rated
takeoff thrust followed by 5 minutes at
not more than 15 percent of rated takeoff thrust;
(iii) One period of 10 minutes at rated
takeoff augmented thrust followed by 2
minutes at idle thrust, except that if
rated maximum continuous augmented
thrust is lower than rated takeoff augmented thrust, 5 of the 10-minute periods must be at rated maximum continuous augmented thrust; and
(iv) Six periods of 1 minute at rated
takeoff augmented thrust each followed by 2 minutes, including acceleration and deceleration time, at idle
thrust.
(2) Simulated supersonic test. Each run
of the simulated supersonic test must
be preceded by changing the inlet air
temperature and pressure from that attained at subsonic condition to the
temperature and pressure attained at
supersonic velocity, and must be followed by a return to the temperature
attained at subsonic condition. Thirty
runs of 4 hours each must be made,
consisting of - 
(i) One period of 30 minutes at the
thrust obtained with the power control
lever set at the position for rated maximum continuous augmented thrust
followed by 10 minutes at the thrust
obtained with the power control lever
set at the position for 90 percent of
rated maximum continuous augmented
thrust. The end of this period in the
first five runs must be made with the
induction air temperature at the limiting condition of transient overtemperature, but need not be repeated

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