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Subject: Bell 212 Fireshield Gaskets
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NightAlUser is Offline
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02/13/2011 9:11 PM  
We're currently working on a Bell 212.  Bell sells the gaskets for the plenum, driveshaft tunnel, ejectors, etc. in individual pre-cut, pre-drilled pieces. They're proud of 'em too.  I'm looking to buy this stuff on a roll from 3M or whomever. I've got no MIL-Spec or N.S.N. to work with. Any info?
helicopterpilot88User is Offline
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08/11/2011 10:10 AM  
Call MFG for mil-spec? why not purchase the bell product?
NightAlUser is Offline
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05/23/2012 2:23 AM  
Sorry for the slow response. I don't get on here much, these days. Valid question. As to the Bell product, they come in individual pieces. We're talking numerous different part numbers. Price and pro-curability was an issue. As to the Mil-Spec, I talked to the Tech Rep. He said, "No Problem. I'll get ya a Mil-Spec." A couple of days later, he called back, chagrined that he could not find the Mil-Spec. In the end, we found an appropriate material for the temperatures in this application. Thanks for responding.
helicopterpilot88User is Offline
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10/15/2012 9:09 PM  
NightAl, interesting question for you, as a new AP. given you did not purchase the MFG gaskets, and a mil-spec did not exist, and barring any purchase of your gasket material from a PMA, by what authority is this an airworthy repair since there is apparently replacement called out? I am unclear on the grey areas surrounding airworthiness decisions such as these.
helicopterpilot88User is Offline
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10/15/2012 9:10 PM  
EDIT**: "since there is apparently NO replacement P/N called out by the MFG?"
NightAlUser is Offline
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01/14/2013 3:31 AM  
Good question. As you said that you are a new A&P, I offer some advice: As to aircraft maintenance; whenever deviating from the scope of one's normal duties, (even when performing procedures addressed in the MM/CRO/Other manual), one should ask oneself four questions: 1. Am I thinking/acting beyond my pay grade? In a 135/145, it may not be your call. In these environments, it's best to run it up the COC before proceeding. 2. Will my PMI be cool with this? Some PMIs want to work with you. Others act as if they are your adversary. 3. Is this repair kosher? "Airworthy" means the aircraft conforms to its type design and is in a condition for safe operation. You won't find that definition in the FARs. You will find it in 8130.2G. 4. Do I have the skills and experience to do this or do I have a guy that has the skills and experience to do this? Making gaskets is easy. Other tasks, not so much. Anyhow, the short answer is: We were hamstrung by the aircraft manufacturer. So, we had to fabricate the gaskets. We found a material that met the requirements, so we made it happen. The long answer,(as to how we felt that we were acting within the law): We were performing a minor repair as defined in FAR 1. We felt that we were in compliance with FAR 43.13(b), 21.9(a)(6). Although we didn't perform the tests outlined in DOT/FAA/AR-00/12 Aircraft Materials Fire Test Handbook, we were satisfied, (using the data supplied by the manufacturer), that the material met those requirements. We did try to light off or melt this substitute material with a bottle torch. It passed. I'm sure that you noted my use of the word "felt". Sometimes, in this business, one can't find the answer in black and white. I've been on the hot seat with more than one PMI and during more than one deposition in a civil suit. In this instance, I didn't "feel" that we were hanging it out that far.
NightAlUser is Offline
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01/14/2013 3:32 AM  
Sorry that my paragraph breaks disappeared when I posted this. This usually doesn't happen with Google Chrome.
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