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522.6.1 Impact (AG).

Zoomup
Have you every said: " I haven't got a grommet or bush so I'll just run the cable through the sharp edged metal hole anyway. It'll be O.K?"


Well, 522.6.1 says: "Wiring systems shall be selected and erected so as to minimise the damage arising from mechanical stress, e.g. by ABRASION, PENETRATION, TENSION, or COMPRESSION, during installation, use or maintenance."


The old familiar expression comes to mind: for the want of a nail the horseshoe was lost, and its following disastrous consequences. For the want of a grommet, materials and correct installation lives were lost.

https://www.youtube.com/watch?v=Ql16ggFvc_g


Z.


Parents
  • 0
    The take I got from that video were that two astonishing deficiencies combined to cause the loss of the aircraft. First, that the metallised mylar sheets were highly flammable, yet were still approved for airliner use. Second, that there was no requirement for loose unsheathed cable runs to be protected from rubbing against metallic guides, given the vibration and shaking that an airliner is liable to experience over its lifetime. Hopefully things have improved since them.
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  • 0
    The take I got from that video were that two astonishing deficiencies combined to cause the loss of the aircraft. First, that the metallised mylar sheets were highly flammable, yet were still approved for airliner use. Second, that there was no requirement for loose unsheathed cable runs to be protected from rubbing against metallic guides, given the vibration and shaking that an airliner is liable to experience over its lifetime. Hopefully things have improved since them.
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