Sec. 23.607 - Fasteners.
(a) Each removable fastener must
incorporate two retaining devices if the loss of such fastener would
preclude continued safe flight and landing.
(b) Fasteners and their locking devices
must 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.
[Doc. No. 27805, 61 FR 5148, Feb. 9, 1996]