Recurring 337

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AskBob
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Recurring 337

A question for IA's and other smart mechanics:  

Some helicopter special ops have camera mounts installed per an STC using a 337, a few days later they will remove the mount with another 337 and return the aircraft to original.  Over the course of a year or two this same mount may be installed and removed 20 - 25 times or more.  Question:  If nothing else has changed, is it permissible to sign off the installation in the log book by referencing the original 337 instead of submitting a new one each time it's installed and each time it's removed.

 
Or, is there a better way to do this?  Some aircraft have seats removed and a litter or stretcher installed and removed on a regular basis, do they use a new 337 each time?  How about float planes when the floats come on and off?

 
I can't find anything in the regs that specifically permit or prohibit referencing a previous 337.

 
Thank you in advance for your input.
Ray Smith

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Anonymous (not verified)
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I would create a 337 that states the equipment is removable. You’re not taking the actual attaching anchors on and off each time correct? Make a weight and balance with and without the mount, and from then on I would say that a log book entry would suffice.

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