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Old 5th Feb 2015, 16:40
  #680 (permalink)  
RatherBeFlying
 
Join Date: Sep 2001
Location: Toronto
Posts: 2,553
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Strap Fatigue

Once overloaded, it's time to retire the strap.

Unlike aluminum parts where a crack propagation can be seen and analysed, I don't know what could be found by examining a failed strap. This will be a new area for the NTSB to explore.

If these straps had been used over dozens of flights with some overstresses, they would not be at full new strength.

Climbers retire equipment after one or more falls.

The landing seems to have damaged some straps, likely those restraining forward movement. Then we have a failure in straps restraining backward movement. Was there an elastic rebound on landing that overstressed the straps restraining backward movement

Or did the straps hold while the anchor points gave way?
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