---
title: "CS 25.607 Fasteners — CS-25 · Avioverse"
description: "(See AMC 25.607) (a) Each removable bolt, screw, nut, pin or other removable fastener must incorporate two separate locking devices if – (1) Its loss…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-d/cs-25-607"
---

# CS 25.607 Fasteners

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

IR Implementing rule

## CS 25.607 Fasteners

(See AMC 25.607)

(a) Each removable bolt, screw, nut, pin or other removable fastener must incorporate two separate locking devices if –

(1) Its loss could preclude continued flight and landing within the design limitations of the aeroplane using normal pilot skill and strength; or

(2) Its loss could result in reduction in pitch, roll or yaw control capability or response below that required by Subpart B of this CS-25.

(b) The fasteners specified in sub-paragraph (a) of this paragraph and their locking devices may not be adversely affected by the environmental conditions associated with the particular installation.

(c) No self-locking nut may be used on any bolt subject to rotation in operation unless a non-friction locking device is used in addition to the self-locking device.

IR · CS 25.607 — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.607 Fasteners

FAA Advisory Circular AC 20-71 Dual Locking Devices on Fasteners, date 12-8-70, is accepted by the Agency as providing acceptable means of compliance with CS 25.607.

AMC · AMC 25.607 — 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](https://avioverse.aero/regulations/easa/cs-25/subpart-d)

Consolidated from the EASA Easy Access Rules (revision 26 Jan 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.