ED Decision 2011/012/R
(a) Fasteners (e.g. bolts, pins, screws, karabiners) used in the structure must conform to approved specifications.
(b) Locking methods must be established and documented.
(c) Unless a joint is free from relative movement, secondary locking means must be used.
(d) Self-locking nuts may not be used on bolts that are subject to rotation in service.
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