AMC E 740(c)(3) Endurance tests

(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]