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recapen(at)earthlink.net
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 Posted: Fri Jun 29, 2012 1:51 pm Post subject: Prop strike - by a hangar door |
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Here’s my scenario:
We had a tornado at my local airport – looks like the sliding hangar door was pushed in to the prop (MT 3 blade Hydraulic CS) of my plane. It was in the hangar at the time – not running – just sitting there innocently in its chocks. The first look –see didn’t reveal any obvious damage – closer inspection made a difference. I can see damage to the spinner and the lower two blades wobble not so nicely as compared to the rock solid top one.
At a minimum, I’m thinking the prop gets rebuilt.
I’m concerned about impact damage to the front of the engine. What could have been damaged? Would it be worth my while to have someone put a dial indicator to the prop flange? What would be your suggestion to determine if it needs to be torn apart and measured? I haven’t tried rotating it through yet – in case I could make things worse.
Full inspection tomorrow – this was just what came from the first look through.
Your thoughts please,
Ralph Capen
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Fri Jun 29, 2012 5:00 pm Post subject: Prop strike - by a hangar door |
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Ralph:
I'm guessing here since I can't see the damage or feel the engine. BUT! I really doubt if there is any damage to the engine. The prop more than likely adsorbed all the forces and saved the engine. What you have to do now is check the T.I.R.
(Total Indicated Runout) of the prop flange. Check it in both planes Horizontal and Vertical. Then go to the maintenance manual for what is allowed. I do not remember but I think anything 0.007" and below is good. You probably do not own a dial indicator so an A&P will have to be brought in and he should have the equipment as well as know the information. Make sure he has a manual for your engine & S/N.
Best of luck,
Barry
Kill a pigeon and feed the people.
Kill a deer and feed the people.
Kill a bear and feed the people.
Kill the people and save the earth.
On Fri, Jun 29, 2012 at 5:49 PM, Ralph E. Capen <recapen(at)earthlink.net (recapen(at)earthlink.net)> wrote:
[quote]
Here’s my scenario:
We had a tornado at my local airport – looks like the sliding hangar door was pushed in to the prop (MT 3 blade Hydraulic CS) of my plane. It was in the hangar at the time – not running – just sitting there innocently in its chocks. The first look –see didn’t reveal any obvious damage – closer inspection made a difference. I can see damage to the spinner and the lower two blades wobble not so nicely as compared to the rock solid top one.
At a minimum, I’m thinking the prop gets rebuilt.
I’m concerned about impact damage to the front of the engine. What could have been damaged? Would it be worth my while to have someone put a dial indicator to the prop flange? What would be your suggestion to determine if it needs to be torn apart and measured? I haven’t tried rotating it through yet – in case I could make things worse.
Full inspection tomorrow – this was just what came from the first look through.
Your thoughts please,
Ralph Capen
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