(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 installation.
- (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]