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max8992
Joined: 28 Jul 2011
Posts: 142
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 Posted: Wed Apr 18, 2012 1:00 am Post subject: Airmaster AP332: replacement of slip ring brishes |
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Hi There All,
According to the Airmaster maintenance manual (see above) the brushes should be replaced when… they are used! Has anybody an idea of their life-time? We have nowadays 425 hours (and close to periodic 100) with original brushes and I’d like to avoid unplug them just to verify.
Thanks for every answer.
Section 11.3.2. Replacement of Slip-Ring Brushes
The sensor/brush assembly brushes that run on the slip-ring will progressively wear down, as they
act on the slip-rings. Once they have become so worn that the spring behind them is at full
extension, they will no longer have good contact with the slip-ring. This may be observed during
an inspection of the propeller, or may become apparent as a result of an open circuit failure of the
pitch change mechanism (indicated by all three controller indicators flashing red).
Rgds
Max Cointe
F-PMLH TriGear Kit #560
912ULS Airmaster 420 hours
mcointe(at)free.fr (mcointe(at)free.fr)
[quote][b]
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Max8992
Europa XS #560 F-PMLH |
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raimo.toivio(at)rwm.fi
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| Posted: Wed Apr 18, 2012 6:14 am Post subject: Airmaster AP332: replacement of slip ring brishes |
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Max
After three years /160 hrs trouble free service I removed the brush box to verify unused lenght of the brushes. I compared them to new ones. There was still 2/3 to go (= useful lenght) in every brush. So I suppose it would be a good time to change them for new in F-PMLH´s case!
I do remember Airmaster-Martin estimated me they will last typically at least 300 hrs. That is well inline.
BTW it was a minor 20 minutes task to take it (a slip ring brush box, it is not necessary to open it!) away, verify and instal back (safety wireing takes some time). Will do it every 50 hrs or so in future.
***
This was also very first time I removed also the blades to service the blade bearings and the hub internal parts (yes – I know Airmaster Service Manual call it to do first 25 hrs, 50 hrs, 100 hrs and then every single 100 hrs). I have to say it looked a new like. Also that red grease looked fresh and totally undirty. Anyway I removed all grease and did all the tasks as per manual. That took a whole day long but maybe I was extra careful /concerned. I feel it is better to do seldom and as well as you can (if there are no marks of problems) than often and a bit hurry. Grease I used was Aeroshell 22.
Cheers, Raimo Toivio
[img]cid:9A0C7FF6658F45CA9C021D2D24C0D90E(at)Asus[/img]
Europa XS Mono OH-XRT #417
Updated flight hours /landings: 258,15 /466
37500 Lempaala
FINLAND
p +358-3-3753 777
f +358-3-3753 100
toivio(at)fly.to (toivio(at)fly.to)
www.rwm.fi
From: Max Cointe (mcointe(at)free.fr)
Sent: Wednesday, April 18, 2012 11:59 AM
To: europa-list(at)matronics.com (europa-list(at)matronics.com)
Subject: Airmaster AP332: replacement of slip ring brishes
Hi There All,
According to the Airmaster maintenance manual (see above) the brushes should be replaced when… they are used! Has anybody an idea of their life-time? We have nowadays 425 hours (and close to periodic 100) with original brushes and I’d like to avoid unplug them just to verify.
Thanks for every answer.
Section 11.3.2. Replacement of Slip-Ring Brushes
The sensor/brush assembly brushes that run on the slip-ring will progressively wear down, as they
act on the slip-rings. Once they have become so worn that the spring behind them is at full
extension, they will no longer have good contact with the slip-ring. This may be observed during
an inspection of the propeller, or may become apparent as a result of an open circuit failure of the
pitch change mechanism (indicated by all three controller indicators flashing red).
Rgds
Max Cointe
F-PMLH TriGear Kit #560
912ULS Airmaster 420 hours
mcointe(at)free.fr (mcointe(at)free.fr)
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ptag.dev(at)tiscali.co.uk
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| Posted: Wed Apr 18, 2012 10:59 am Post subject: Airmaster AP332: replacement of slip ring brishes |
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Hi! Svein and all CS /Inflight variable props.
When I had my MT CS prop it was necessary for me to fabricate my own bracket to hold the brush holder in place to mate with the slip rings.
The major requirement of adjustment if I recall correctly was that the brushes should be at a 2 degree “Trailing” attitude( with no tolerances applicable) to the direction of rotation and exactly on the centre line.
(It was completely unacceptable that there should be any leading/”Pushing” angle)
I would expect that MT are one of the most experienced producers of this type of Propeller and would never attempt to contradict their design wishes.
Hope this information helps you not forgetting that the actual measurement of the dimension as small as that is quite a trial of competence of the average builder.
Regards
Bob Harrison G-PTAG Now with Rotax 914 and Woodcomp SR 3000. ( with one brush replaced ) since new but last season was given a works refurb in Cech .at 300 hours approx.
When I’ve time I will do some hour calcs.
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Sidsel & Svein Johnsen
Sent: 18 April 2012 16:17
To: europa-list(at)matronics.com
Subject: SV: Airmaster AP332: replacement of slip ring brishes
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
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ptag.dev(at)tiscali.co.uk
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| Posted: Wed Apr 18, 2012 12:23 pm Post subject: Airmaster AP332: replacement of slip ring brishes |
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Hi! Svein ,
I would still prefer to measure the actual angles and especially prove them to be “trailing “
Regards
Bob H
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Sidsel & Svein Johnsen
Sent: 18 April 2012 20:20
To: europa-list(at)matronics.com
Subject: SV: Airmaster AP332: replacement of slip ring brishes
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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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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| Posted: Thu Apr 19, 2012 2:11 am Post subject: Re: Airmaster AP332: replacement of slip ring brishes |
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Hi Max,
I replaced my first set of brushes after 266 hours. They were found to be about 80 percent worn out. Now I have 272 hours on those brushes, so I am planning to replace them again right now, so that I do not get into trouble during the summer season.
Regards
Remi Guerner
F-PGKL
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raimo.toivio(at)rwm.fi
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| Posted: Thu Apr 19, 2012 8:48 am Post subject: Airmaster AP332: replacement of slip ring brishes |
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Dear Bob,
do you remember how much the MT brushes protrude out of the box ie. what is the lenght of the unsupported brush part = the cap between slip rings and a brush box brush side ?
I my case (just what happen to be in my Rotax & Airmaster combination) this measure is about 1 mm or even less. I think then it is no matter if brushes are a bit “trailing”, “straight” or even “leading”.
They will anyway soon worn out to totall slip ring contact.
Cheers, Raimo
Finland
OH-XRT
From: Bob Harrison (ptag.dev(at)tiscali.co.uk)
Sent: Wednesday, April 18, 2012 11:21 PM
To: europa-list(at)matronics.com (europa-list(at)matronics.com)
Subject: RE: Airmaster AP332: replacement of slip ring brishes
Hi! Svein ,
I would still prefer to measure the actual angles and especially prove them to be “trailing “
Regards
Bob H
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Sidsel & Svein Johnsen
Sent: 18 April 2012 20:20
To: europa-list(at)matronics.com
Subject: SV: Airmaster AP332: replacement of slip ring brishes
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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ptag.dev(at)tiscali.co.uk
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| Posted: Thu Apr 19, 2012 10:41 am Post subject: Airmaster AP332: replacement of slip ring brishes |
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Hi! Raimo
First off ....how is that little girl?
I hope now home and happy?
If my memory serves me right I think the block was 0.0025” clear of the slip ring, but with any slack in the propeller assembly must be pushed back for worst case scenario.
Trailing , leading or straight provides differing brush loads .... Leading being the heaviest and hence more wear more quickly.
Regards
Bob H G-PTAG
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Raimo Toivio
Sent: 19 April 2012 17:48
To: europa-list(at)matronics.com
Subject: Re: Airmaster AP332: replacement of slip ring brishes
Dear Bob,
do you remember how much the MT brushes protrude out of the box ie. what is the lenght of the unsupported brush part = the cap between slip rings and a brush box brush side ?
I my case (just what happen to be in my Rotax & Airmaster combination) this measure is about 1 mm or even less. I think then it is no matter if brushes are a bit “trailing”, “straight” or even “leading”.
They will anyway soon worn out to totall slip ring contact.
Cheers, Raimo
Finland
OH-XRT
From: Bob Harrison (ptag.dev(at)tiscali.co.uk)
Sent: Wednesday, April 18, 2012 11:21 PM
To: europa-list(at)matronics.com (europa-list(at)matronics.com)
Subject: RE: Airmaster AP332: replacement of slip ring brishes
Hi! Svein ,
I would still prefer to measure the actual angles and especially prove them to be “trailing “
Regards
Bob H
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Sidsel & Svein Johnsen
Sent: 18 April 2012 20:20
To: europa-list(at)matronics.com
Subject: SV: Airmaster AP332: replacement of slip ring brishes
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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56789012345678901234
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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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| Posted: Mon Apr 23, 2012 6:57 am Post subject: Re: Airmaster AP332: replacement of slip ring brishes |
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Max,
I have to amend my previous post after having checked my brushes today. Surprisingly they are still protuding 7 to 8 mm from the body of the sensor/brush assembly after 275 hours. This is to be compared with 12mm when new. So they are probably good for another 300 hours. This is a great improvement over the original brushes I had to replace after 265 hours.
Remi
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