Sec. 25.607 - Fasteners.
(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 airplane using
normal pilot skill and strength; or
(2) Its loss could result in reduction
in pitch, yaw, or roll control capability or response below that required
by Subpart B of this chapter.
(b) The fasteners specified in paragraph
(a) of this section and their locking devices may not be adversely
affected by the environmental conditions associated with the particular
(c) No self-locking nut may be used on
any bolt subject to rotation in operation unless a nonfriction locking
device is used in addition to the self-locking device.
[Amdt. 25-23, 35 FR 5674, Apr. 8, 1970]