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ROTORwrench…Tips, Tricks, and Info - August 2016

Posted 7 years 284 days ago ago by Scott Skola

Helicopter Maintenance Blog 

August 2016

I should be rolling back into town as this issue of the blog rolls out.

I really appreciate the input you send in. Really. If you have any tips or tricks and would like to share them, send them in. Any maintenance questions? Those are welcome too. Hopefully my computer won’t be too pissed by my absence and will boot up with no issues. Till then. 


ATA 71
AS350 series

Back when the only inlet filter option for an Arriel engine was the bleed air type, it was a pain to comply with ground runs as the cowling had to remain installed with the filter bleed air line connected. There supposedly was a factory cap for the fitting on the engine that enabled removal of the cowling/filter assembly. But we, nor the tech reps, could ever procure one. 

We did attempt to fabricate one similar to the pressure caps used on MBB products which consisted of the proper sized “B” nut with a steel ball bearing nestled in it to seal at the fitting flare. Except it was hard to justify destroying a $2500 bleed air hose just to get the fittings.

Enter an enterprising machinist. It’s made from brass to allow ease of machining and provide a sacrificial mode in case someone tried to cross thread it. [Submitted by DS]

A couple newsletters from Honeywell.


Have an old tip or trick you’d like to share with your fellow mechanics? Or maybe a question that you can’t seem to find an answer to? Or just some info to pass on?  Send an email to [email protected]

About the author: After 32 years maintaining helicopters in various capacities, Scott concluded a full time career with a major operator in 2014. When not pursuing future writing projects, he can still be seen around the flight line tinkering on aircraft for beer money.  He can be contacted at [email protected]