Re: What would cause a fan blade to fail?
Posted by:
PwrWgnDrvr
(207.200.116.---)
Posts: 1,438
Date: July 06, 2009 04:39PM
Russ, air pressure did not bend it like that. Hitting the rad did.
Per George, it happened like this:
1. Gary says there was about 1" clearance on the 2 blades he checked
2. This fan blade was likely bent at some time prior to running the engine and Gary didnt notice.
3. It only had to be bent 1/2-3/4" forward of the plane - that's barely noticable and easily missed
4. Gary ran the engine at high rpm
5. The normal forward flexation of the fan at speed, on top of the small bend already in that blade, was enough to hit the rad.
6. Impact folded the blade over like u see it now