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sidsel.svein(at)oslo.onli
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 Posted: Wed Apr 18, 2012 7:18 am Post subject: SV: Airmaster AP332: replacement of slip ring brishes |
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Max,
My first set of brushes lasted only 110 hours, then all three were worn out – got the fault indication on the controller panel. Martin at Airmaster said it was maybe a bit short even for a new prop, but shorter than normal should be expected due to new slip rings.
“New” is a relative term – the brushes and rings were unused when the hours started counting, but they had both been manufactured some 5 years earlier. Whether this played any role, I don’t know.
Regards,
Svein
LN-SKJ
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sidsel.svein(at)oslo.onli
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| Posted: Wed Apr 18, 2012 11:20 am Post subject: SV: Airmaster AP332: replacement of slip ring brishes |
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Hi Bob,
Appreciate your comments regarding correct installation of the brushes relative to the rings.
My Airmaster was delivered with a brush bracket for Rotax 912ULS. The holes matched exactly the holes on the left side of the gearbox, and the distance to the slip rings looks right (small unsupported length of the brushes sticking out, yet clearance to avoid the bracket touching the rings).
Regards
Svein
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Thu Apr 19, 2012 7:41 am Post subject: Re: SV: Airmaster AP332: replacement of slip ring brishes |
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Hi All,
Another interesting failure mode of the brush system occurred to me
at about 290 hours. I had a tiny (very tiny) oil leak from the hydraulic
hose fittings at the oil pump assembly. (I had replaced the clunky, inaccurate
VDO sensor with a mil-spec transducer mounted on the fire-wall).
The negative direction airflow around the gear box deposited the oil film
on slip ring plate where, mixed with the carbon dust, it shorted out the
rings and failed the controller. The allowed a transient overspeed
condition on takeoff power. Wiping the plate with a rag fixed the condition
and tightening the connectors fixed the leak.
Motto: No good deed goes unpunished
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Ira N224XS |
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stephen vestuti
Joined: 05 Jul 2011
Posts: 62
Location: Wales, UK
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| Posted: Thu Apr 19, 2012 8:36 am Post subject: Re: SV: Airmaster AP332: replacement of slip ring brishes |
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Ira,
Was the controller trashed or just a fuse ?
Steve.
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rampil
Joined: 04 May 2007
Posts: 870
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