---
title: "AMC E 740(c)(3) Endurance Tests — CS-E · Avioverse"
description: "Two procedures for running the tests required under CS-E 740(c)(3) are acceptable:"
url: "https://avioverse.aero/regulations/easa/cs-e/subpart-e/amc-e-740-c-3-endurance-tests"
---

# AMC E 740(c)(3) Endurance Tests

Engines (CS-E) · CS-E · EAR revision 7 Dec 2023

AMC Acceptable means of compliance

## 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 subjected to a strip inspection in accordance with CS-E 740(i)(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(i)(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(i)(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(i)(2).

(2) Per CS-E 50(j), the Engine control should prevent exceedance 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- second 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]

AMC — CS-E · ED Decision 2007/015/R · CS-E Easy Access Rules · EAR revision 7 Dec 2023

[All rules in SUBPART E – TURBINE ENGINES: TYPE SUBSTANTIATION](https://avioverse.aero/regulations/easa/cs-e/subpart-e)

Consolidated from the EASA Easy Access Rules (revision 7 Dec 2023, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.