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richard.goode(at)russiana
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 Posted: Sun Jul 14, 2013 8:41 am Post subject: prop strike |
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I am not saying that an M 14 P should be completely stripped down if it has a prop strike – I was merely pointing out that the original instruction came from the engine designer and not from Termikas, who, like me, has a certain vested interest in engine overhauling.
However, to make it clear, in Europe we do not automatically strip down any engine that has had a prop strike – as has been pointed out there is a big range of strikes which can have different results.
What we do, however, is to remove the gearbox, and check the crankshaft "run – out". If it is less than 0.03 mm, we accept that the basic engine will be fine, and in that case we simply crack test the gearbox components; overhaul and then reassemble the gearbox and return the engine to service. The cost of this is approximately $1800. It seems to me this is hardly a huge amount for the peace of mind and safety implications.
On some occasions (very few) we find that the crankshaft "run – out" is more than the accepted maximum (above), and in that case we perform a shock load test on the entire engine.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
[quote][b]
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mark.bitterlich(at)navy.m
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| Posted: Mon Jul 15, 2013 6:24 am Post subject: prop strike |
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Reply to "Some more thoughts".
And yes, that is absolutely true, the accessory shaft is from all I have
read, the weakest link in the system.
This is why I am very very careful to have accurate timing marks on my
engine and record exact timing indications.
If even a minor prop strike occurs, the very first thing you want to
check is to see if the timing on the engine has changed. No matter how
minor the strike, if the timing on the engine has changed, that shaft
has a high probability of being damaged and the engine will require a
tear down. I believe I have mentioned this before.
Mark Bitterlich
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dsavarese0812(at)bellsout
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| Posted: Mon Jul 15, 2013 7:10 am Post subject: prop strike |
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I concur 100%. That is the first place to check.
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 7/15/2013 9:20 AM, Bitterlich, Mark G CIV NAVAIR, WD wrote:
[quote]
Reply to "Some more thoughts".
And yes, that is absolutely true, the accessory shaft is from all I have
read, the weakest link in the system.
This is why I am very very careful to have accurate timing marks on my
engine and record exact timing indications.
If even a minor prop strike occurs, the very first thing you want to
check is to see if the timing on the engine has changed. No matter how
minor the strike, if the timing on the engine has changed, that shaft
has a high probability of being damaged and the engine will require a
tear down. I believe I have mentioned this before.
Mark Bitterlich
--
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