cpayne(at)joimail.com
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 Posted: Tue Apr 01, 2008 3:13 pm Post subject: Gear Collapse Note |
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Normally I ignore the witty and learned banter exchanges on the yak-list as they are not all that illuminating. However, a gear collapse is serious stuff to me. I visually checked my retraction links today and saw nothing new from the last time I went through my gear a few years back.
This design of this component seems more than adequate for normal design loads. That being said, manufacturing problems can occur anywhere, on any product. There are heat treatment procedures, especially following chrome plating that may be at fault. Maintenance problems could result from too much (or too little) clearance when installed. Regular grease changes are advisable too.
There are operational practices. Regular Ops results in many gear cycles, taxi stresses, and everything else that was taken in consideration by engineers. Then there are questionable field maintenance procedures, such as removing the air flow restrictors for "snappy" gear response. This will result in shock and vibration for every cycle that would not normally occur. BAD JU JU! If you don't use flow restrictors, get them. They are cheap insurance for all sorts of maladies and can be adjusted to deliver that satifying "snick" as all three lights come on together, both on the up and down while minimizing shock loads.
IMHO, leaving the gear handle up while flying does not impose a shock load and actually reduces fatigue cycles.
Just my devalued 2 cents USD worth.
Craig Payne
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