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Filtered Air Box Failure

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Dave(at)AirCraftersLLC.co
Guest

Posted: Sun Mar 01, 2009 11:55 am Post subject: Filtered Air Box Failure

While we're on the subject, two weeks ago after about 300 hours, our FAB was

found failed.



The filter had rubbed its way all the through the fiberglass on the bottom

edge.  There was a split in the glass along the outside edge of the filter

in an arc of about 120 degrees.



I think the fact that the filter is slighly compressed when the airbox is

bolted closed gave it some preload against the glass, combined with enough

vibration to wear through.



We cleaned up the FAB and patched the crack, allowing the filter a tiny bit

more room inside the box so that maybe with less pressure against the glass,

it won't work against the inside as hard.  But, too little pressure and it

won't seal.  It's a fine line.  I'll defineatly be watching it.  From the

inside, you should be able to catch this happening long before it wears

through.  I don't think I ever bothered to look closely.



Remember that any repairs on the FAB should be done with vinyl ester as it

is fuel proof.  Epoxy may or may not be, and fuel does tend to end up in the

FAB from time to time.



Dave Saylor

AirCrafters LLC

140 Aviation Way

Watsonville, CA 

831-722-9141

831-750-0284 CL

www.AirCraftersLLC.com



N921AC 335 hours

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AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Wed Mar 04, 2009 2:35 pm Post subject: Filtered Air Box Failure

Wow - thanks for the heads up on that Dave. Might be a good idea to add a bit more glass during the build while the unit is free of grease. good post.

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