richard.goode(at)russiana
Guest
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 Posted: Mon May 22, 2006 7:38 am Post subject: Ground-strikes and M14P Engines |
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We are concerned that some pilots, following a ground-strike with an M14P, simply change the propeller and continue to go on flying.
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The re are several areas where the M14P can suffer in a ground-strike:
The satellite gears in the gearbox are small and can crack with the shock-load.
The crankshaft is pinned together and a shock can move the separate parts of th e crankshaft in relation to each other.
The supercharger assembly is turning at over eight times engine speed and even at idle has significant inertia.
Lik e all western engines, the manufacturers of the M14P issue STRICT instructions th at ANY ground-strike must result in an engine removal; strip-down and check.</ P>
We had a Sukhoi customer who had a significant ground-strike, but at idle; changed t he prop, and about 10-hours flying later one of the satellite gears broke up, and the engine locked solid. Fortunately he was taxii ng in after an aerobatic sequence. Had it happened a minute earlier t he engine would almost certainly have been torn out.
The re is a degree of discretion which an owner can use, but obviously at his own risk.
Our personal view is that any ground-strike should have at LEAST the gearbox removed; stripped and crack-tested. I f the ground-strike has been mild; and the engine not stopped on impact, AND ther e is no gearbox damage, the engine is probably fine.
&nb sp;
If however, the engine stopped on impact; there is any damage to the gearbox, then an e ngine strip-down must be considered essential.
&nb sp;
Ric hard Goode
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Mob: +44 (0) 7768 610389
Fax: +44 (0) 1544 340129
www.russianaeros.com
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