CS 25.679 Control system gust locks

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

IRImplementing rule

CS 25.679Control system gust locks

(See AMC 25.679)

(a)There must be a device to prevent damage to the control surfaces (including tabs), and to the control system, from gusts striking the aeroplane while it is on the ground. If the device, when engaged, prevents normal operation of the control surfaces by the pilot, it must –

(1)Automatically disengage when the pilot operates the primary flight controls in a normal manner; or

(2)Limit the operation of the aeroplane so that the pilot receives unmistakable warning at the start of take-off. (See AMC 25.679(a)(2).)

(b)The device must have means to preclude the possibility of it becoming inadvertently engaged in flight. (See AMC 25.679(b).)

[Amdt 25/18]

IR · CS 25.679 — CS-25 · ED Decision 2016/010/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMCAcceptable means of compliance

AMC 25.679(a)(2)Control system gust locks

Show the text

If the device required by CS 25.679(a) limits the operation of the aeroplane by restricting the movement of a control that must be set before take-off (e.g. throttle control levers), this device should be such that it will perform the function for which it is designed even when subject to likely maladjustment or wear, so that – a. The movement of that control is restricted as long as the device is engaged; and b. The movement of that control is unrestricted when the device is disengaged.

AMC · AMC 25.679(a)(2) — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMCAcceptable means of compliance

AMC 25.679(b)Control system gust locks

Show the text

For the purposes of meeting the design intent of this paragraph, flight means the time from the moment the aircraft first moves under its own power for the purpose of flight until the moment it comes to rest after landing.

AMC · AMC 25.679(b) — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

All rules in SUBPART D – DESIGN AND CONSTRUCTION

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.

Ask Metis about CS 25.679 →

Metis opens with Avioverse in October 2026 · request early access.