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Large Aeroplanes (CS-25) · CS-25 · EAR revision 26 Jan 2023
IRImplementing rule
(See AMC 25.1315) No hazardous malfunction may occur as a result of the aeroplane being operated at the negative accelerations within the flight envelopes prescribed in CS 25.333. This must be shown for the greatest duration expected for the acceleration.
[Amdt 25/18]
IR · CS 25.1315 — CS-25 · ED Decision 2016/010/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023
AMCAcceptable means of compliance
1 Demonstration of compliance with CS 25.1315 should be made by analysis and/or ground tests, and should be supported by flight tests. 2 Analysis and/or Ground Tests. Appropriate analysis and/or ground tests should be made on components of essential fluid systems and such other components as are likely to be adversely affected by negative acceleration to demonstrate that they will not produce a hazardous malfunction. 3 Flight Tests
3.1 The aeroplane should be subjected to – a. One continuous period of at least five seconds at less than zero g, and, separately, b. A period containing at least two excursions to less than zero g in rapid succession, in which the total time at less than zero g is at least five seconds.
3.2 The tests should be made at the most critical condition from the fuel flow standpoint, e.g. with fuel flow corresponding to maximum continuous power and with the fuel representing a typical operational low fuel condition as for a missed approach.
AMC · AMC 25.1315 — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023
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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