AMC E 740(c)(3) Endurance
tests
ED Decision 2007/015/R
(1) Two procedures for running the tests required under CS-E 740(c)(3) are acceptable:
(a) After the basic 150-hour endurance test the Engine may be subject to a strip inspection in accordance with CS-E 740(h)(1).
The Engine is then reassembled using the same parts used for the 150-hour endurance test except as otherwise allowed by CS-E 740(h)(2)(ii) and the additional 2-hour endurance test is run to CS-E 740(c)(3)(iii).
Completion of the additional 2-hour endurance test would be followed by compliance with the strip inspection specifications of CS-E 740(h)(2)(iii); or
(b) The 2-hour additional endurance test of CS-E 740(c)(3)(iii) may be run immediately after the basic 150-hour endurance test without Engine disassembly.
The strip inspection standards that will be applied after completion of the additional 2-hour endurance test will be those prescribed in CS-E 740(h)(2).
(2) Per CS-E 50(f), the Engine control should prevent exceedence of the speed limitation associated with the 30-Second OEI Power rating. Nevertheless, for ensuring the shortest time of establishment of the corresponding power, it might be necessary to design the Engine control in such a manner that a short overshoot of the speed will occur at the beginning of the 30 seconds period. This is acceptable if this is validated throughout the CS-E 740(c)(3)(iii) test.
(3) In the event of a stop occurring during the four test sequences of CS-E 740(c)(3)(iii), the interrupted sequence needs to be repeated in full or can be re-started from the interrupt point if there is a technical justification acceptable to the Agency. If it is determined that the sequence need not be repeated in its entirety, the test should be restarted from a point where the Engine thermal condition would be the same as at the time of interruption. (See CS-E 740(b)(1)).
[Amdt. No.: E/1]
EASA engine endurance tests (CS-E 740(c)(3)) offer two acceptable procedures: either a 150-hour test followed by inspection and a 2-hour test, or a combined 152-hour test. Brief engine speed overshoots during the 30-second OEI power test are permissible if validated. Interrupted test sequences require repetition or justified restarts maintaining thermal conditions.
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