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CS 25.1363 Electrical system tests

Large Aeroplanes (CS-25) · CS-25 · EAR revision 26 Jan 2023

IRImplementing rule

CS 25.1363Electrical system tests

(See AMC 25.1363)

(a)Tests must be made to determine that the performance of the electrical supply systems meets the requirements of this CS-25 under all the appropriate normal and failure conditions. When laboratory tests of the electrical system are conducted –

(1)The tests must be performed on a mock-up using the same generating equipment used in the aeroplane;

(2)The equipment must simulate the electrical characteristics of the distribution wiring and connected loads to the extent necessary for valid test results; and

(3)Laboratory generator drives must simulate the actual prime movers on the aeroplane with respect to their reaction to generator loading, including loading due to faults.

(b)For each flight condition that cannot be simulated adequately in the laboratory or by ground tests on the aeroplane, flight tests must be made.

IR · CS 25.1363 — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMCAcceptable means of compliance

AMC 25.1363Electrical systems tests

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1 In carrying out the tests due account should be taken of load switching and flight crew operation of the system. 2 Laboratory or Ground Tests

2.1 All tests should be carried out with all equipment as representative as possible of the actual aeroplane. In particular, the simulation should include the correct representation of aeroplane cables in size, length and impedance, the correct ground (airframe) impedance and relative ground plane location and their location to other cables or systems that could influence performance. System loads and the generator drive system should also be correctly simulated.

2.2 The tests may be carried out on representative laboratory rigs or in an actual aeroplane, as appropriate.

2.3 Test procedures should be prepared to cover each test condition in the programme. 3 Aeroplane Flight Tests

3.1 If not adequately simulated by laboratory or ground testing, flight tests should be carried out as necessary.

3.2 Temperature tests should be carried out on equipment to establish the adequacy of the cooling media under all ground and flight conditions.

3.3 Measurements should be made to ensure that all equipment, particularly the aeroplane battery, is operating within its specified environmental conditions.

3.4 Test procedures should be prepared to cover the conditions of the tests.

AMC · AMC 25.1363 — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

All rules in SUBPART F – EQUIPMENT

Consolidated from the EASA Easy Access Rules (revision 26 Jan 2023, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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