AMC E 740(c)(2)(i) Endurance Tests – 30-Minute Power Rating
ED
Decision 2018/014/R
For Rotorcraft turbine Engines to be approved with a 30-Minute Power
rating:
(a) An
applicant may propose either to include the required additional 25 hours
within the overall test normally required by CS-E 740, or to perform a
complementary test on the same test article used for the test required by CS-E
740, or a combination of these methods. If the additional 25 hours
are included within the overall test normally required by CS-E 740, the modified test periods should be
uniformly distributed throughout the endurance testing.
(b) Credit
may be sought for time accrued during testing at the 30-Minute OEI rating
required by CS-E 740. This
allowance excludes the time spent at ‘standard’ Take-off Power. It should then
be shown that these sequences were run with operating limitations that are
equal to or more stringent than the 30-Minute Power rating operating
limitations.
(c) It is
possible that the intended usage and performance characteristics of the Engine
may be such that its power will be subject to mechanical limitations for a
certain portion of its missions. In that case, it may be acceptable to run the
Engine for a representative percentage of the time that is required at the
30-Minute Power rating at these mechanical limitations, but not to exceed 50 % of the
required additional 25 hours (i.e. 12.5 hours). For the remaining percentage
of the time, the Engine should be run at the higher thermal limits. The
proposal must be substantiated and proposed to the Agency for acceptance.
These assumptions will be recorded in the instructions for installing and
operating the Engine, in accordance with CS-E 30(a).
(d) No
specific maintenance action is normally expected following the use of the
30-minute Power rating. This will be justified by compliance with CS-E
740(h)(1).
[Amdt No: E/5]
EASA Rotorcraft Engine Approval: 30-Minute Power Rating Endurance Tests To approve rotorcraft turbine engines with a 30-minute power rating, manufacturers can integrate 25 additional test hours into standard endurance tests, use complementary testing, or combine methods. Credit is given for testing at stringent operating limitations. Mechanical limitations are allowed for a percentage of testing time. No specific maintenance is expected.
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