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Can anyone explain this from AC43.13-2b? Does this mean that bolts in flight controls (including pulleys) must use cotter pins or safety wire? Par. C used to be in a FAR 23.607 and CAR 3.294...just something to think about. What the hell is 2 retaining devices? That include torque and a nylock/cotter pin or a locking washer?
108. FASTENERS. Use hardware conforming to an accepted Government or industry standard such as AN, NAS, TSO, or MIL-SPEC. Attach equipment in such a way that prevents loosening in service due to vibration.
a. Each removable fastener must incorporate two retaining devices in case one retaining device should fail during flight operations.
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.
108. FASTENERS. Use hardware conforming to an accepted Government or industry standard such as AN, NAS, TSO, or MIL-SPEC. Attach equipment in such a way that prevents loosening in service due to vibration.
a. Each removable fastener must incorporate two retaining devices in case one retaining device should fail during flight operations.
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.
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