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brad(at)runawaymedia.co.z
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 Posted: Sat Jun 02, 2012 6:00 am Post subject: Conclusion to the Engine out question |
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Hello All, I have finally been able to conclude the reason for the forced landing of ZU-CWJ here are the pics
The oil pump and Fuel pump are driven of the accessory bevel gear at the back of the engine, this drive shaft has 2 bevel gears and is held in place by a bronze bush. This bush sets up the lash on the main bevel gear and (please correct me here) the tacho drive too.
In the pics you will see that the Bronze bush has been polished where the Locking plate has been vibrating , the lock tabs are all up as should be but they have now been worn oval and have split allowing the 2 nuts to “jump” flats .
This in turn gradually increased the lash on the main bevel drive (creating a faint whine audible off the adjacent hanger doors on idle or shut down.)
Finally the nuts escaped their locking tabs and as we removed the oil pump assembly the one nut dropped into the drip tray. The other was 1 turn from following the first.
Conclusion :
The loosening of the 2 nuts created a gap in the lash where the drive gear could no longer drive the driven gear and as a result the oil and fuel pump ceased to turn thus the engine ran out of fuel.
It is not difficult to inspect the retaining nuts , but it will require the removal of the oil pump / fuel pump assembly.
Hope this will help
Final thought :
The contributors to this forum were unanimously correct that the engine must have run out of fuel and I’m encouraged to see the vast amount of collective knowledge we have to draw on.
“Yak engines don’t just stop”, was the AME’s first words to me during the recovery , I agree with him they are tough and reliable , no matter how you look at it ,when the fuel runs out, that engine isn’t gonna run!
Bradly Banks
Cell:0825083200
Tel :0333308580
Email :brad(at)runawaymedia.co.za
Skype: brad.banks10
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viperdoc(at)mindspring.co
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| Posted: Sat Jun 02, 2012 4:03 pm Post subject: Conclusion to the Engine out question |
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csprjm(at)aol.com
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| Posted: Sun Jun 03, 2012 6:42 pm Post subject: Conclusion to the Engine out question |
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You're the second one. Happened to me last Aug in a 52TW. At 800 ft after TO. Made it back to rwy. Shorts soiled.
Sent via BlackBerry by AT&T
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wlannon(at)shaw.ca
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| Posted: Sun Jun 03, 2012 7:56 pm Post subject: Conclusion to the Engine out question |
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Would it be possible for Bradly and yourself to advise of engine TSO or TSN
at this gear train failure. Sounds like a very good candidate for a
periodic inspection, probably applicable to all models of the Ivchenko
engine series.
Has anyone else found a problem here? Any comments from George Coy, Richard
Broome, etc.?
Thanks;
Walt
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brad(at)runawaymedia.co.z
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| Posted: Sun Jun 03, 2012 9:02 pm Post subject: Conclusion to the Engine out question |
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Hello Walt , the Tso is 425 odd and the TSN is around 1815 I do not have
the exact log times with me as they are now with the Caa for the
investigation.
I would recommend an inspection as it would only mean the removal of the oil
pump and then using a mirror visually inspect the 2 tab washers and the
retaining nuts. And then the re-fitting of the oil pump /fuel pump assembly.
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richard.goode(at)russiana
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| Posted: Sun Jun 03, 2012 11:48 pm Post subject: Conclusion to the Engine out question |
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I've never heard of this problem-it seems to me like poor maintenance at
sometime in the engine's past?
Richard Goode
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
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