31 May 2025, 18:44 [ UTC - 5; DST ]
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Post subject: Better than Giec*, I saved them 2 AMUs  Posted: 21 Oct 2014, 18:02 |
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Joined: 11/09/09
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Had an SR22 in the shop last week.
The issue was the Low volt light was on when it shouldn't have been.
I sent the pictures of the volt and amp display to the tech reps who recommended changing the MCU as they stated the power diode was probably bad.
Well I just had one of those "feelings" that the entire MCU didn't need to be changed at a price of $2100.
I opened the cover and found 2 bad 50 amp midi fuses. I changed them (Yep procedure is in the M/M) Problem fixed.
Midi fuses: $9 each.
Labor: $375.
Sleeping good at night: Priceless
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God created Aircraft Mechanics so Pilots could have heros.
I'd rather be fishing with Andy and Opie
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Post subject: Re: Better than Giec*, I saved them 2 AMUs Posted: 21 Oct 2014, 18:20 |
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Username Protected wrote: I would put copper strips in there instead - problem fixed forever.  Well I do have a couple of .22 long rifle but couldn't get them to fit and put the cover back on...
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God created Aircraft Mechanics so Pilots could have heros.
I'd rather be fishing with Andy and Opie
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Post subject: Re: Better than Giec*, I saved them 2 AMUs Posted: 22 Oct 2014, 01:36 |
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Joined: 05/25/12
Posts: 469
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Location: Kortrijk Belgium, Europe (EBKT)
Aircraft: 1973 Bonanza A36
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Username Protected wrote: I would put copper strips in there instead - problem fixed forever. Well I do have a couple of .22 long rifle but couldn't get them to fit and put the cover back on...
that would give a whole new meaning to blowing a fuse?
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Post subject: Re: Better than Giec*, I saved them 2 AMUs Posted: 22 Oct 2014, 13:16 |
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Joined: 05/23/08
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Location: CMB7, Ottawa, Canada
Aircraft: TBM - C185 - T206
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Must be a typo, is that .5 or 5 amps? 50 amps? Username Protected wrote: What caused 2 50-Amp fuses to blow? That would be my concern.
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Former Baron 58 owner.
Pistons engines are for tractors.
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Post subject: Re: Better than Giec*, I saved them 2 AMUs Posted: 22 Oct 2014, 13:42 |
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If you'll remember an earlier post this is the same plane that had the flap motor running continuously in flight as it had been improperly rigged.
When flaps were selected to 0 the motor didn't quite get to zero so the motor continued to run.
I am thinking this had something to do with the fuses but time will tell.
It could have also had a GPU connected while the battery was removed during it's recent annual...
...at a different shop.
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God created Aircraft Mechanics so Pilots could have heros.
I'd rather be fishing with Andy and Opie
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Post subject: Re: Better than Giec*, I saved them 2 AMUs Posted: 22 Oct 2014, 13:48 |
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Username Protected wrote: I suppose the GPU could be it, but I doubt the flap motor. It draws maybe 10 amps maximum? Figuring the circuit breaker is rated for 10 or 15 amps max it would have tripped well before a 50 AMP main fuse. Even if the flap breaker failed, it would have smoked the wires going to the motor well before the 50 amp fuses blew. Todd, Yep. However I have been around these flying contraptions long enough that I have learned never to use the word "never." Bill
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God created Aircraft Mechanics so Pilots could have heros.
I'd rather be fishing with Andy and Opie
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Post subject: Re: Better than Giec*, I saved them 2 AMUs Posted: 22 Oct 2014, 18:59 |
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Joined: 12/25/10
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Location: Bourland Field 50F Cresson, TX
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Username Protected wrote: If you'll remember an earlier post this is the same plane that had the flap motor running continuously in flight as it had been improperly rigged.
When flaps were selected to 0 the motor didn't quite get to zero so the motor continued to run.
I am thinking this had something to do with the fuses but time will tell.
It could have also had a GPU connected while the battery was removed during it's recent annual...
...at a different shop. So you did not make any checks and your troubleshooting mantra is 'time will tell"? That is all the concern for TWO 50 amp Fuses?. Does the aircraft have a vacuum system back up? from my SR20 manual "In addition to the individual circuit breakers, 25-amp fuses located on the primary bus in the Master Control Unit (MCU) protect the Main Bus 1, Main Bus 2, and the Non-Essential Bus in the single alternator system. Additionally, the single alternator system uses 15-amp fuses located in the MCU to protect the landing light and standby vacuum pump circuits." Is it possible as asked earlier they are 15 not 50 amp fuses. Are these not important enough to check for a cause?
Last edited on 23 Oct 2014, 11:42, edited 1 time in total.
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Post subject: Re: Better than Giec*, I saved them 2 AMUs Posted: 22 Oct 2014, 21:51 |
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Joined: 11/09/09
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Username Protected wrote: If you'll remember an earlier post this is the same plane that had the flap motor running continuously in flight as it had been improperly rigged.
When flaps were selected to 0 the motor didn't quite get to zero so the motor continued to run.
I am thinking this had something to do with the fuses but time will tell.
It could have also had a GPU connected while the battery was removed during it's recent annual...
...at a different shop. So you did not make any checks and your troubleshooting mantra is 'time will tell"? That is all the concern for TWO 50 amp Fuses?. Does the aircraft have a vacuum system back up? from my SR22 manual "In addition to the individual circuit breakers, 25-amp fuses located on the primary bus in the Master Control Unit (MCU) protect the Main Bus 1, Main Bus 2, and the Non-Essential Bus in the single alternator system. Additionally, the single alternator system uses 15-amp fuses located in the MCU to protect the landing light and standby vacuum pump circuits." Is it possible as asked earlier they are 15 not 50 amp fuses. Are these not important enough to check for a cause?
Of course I made checks.
I performed a complete MCU operational check when I was finished with no further issues noted.
What are you getting at?
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God created Aircraft Mechanics so Pilots could have heros.
I'd rather be fishing with Andy and Opie
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Post subject: Re: Better than Giec*, I saved them 2 AMUs Posted: 23 Oct 2014, 09:28 |
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Username Protected wrote: Don't worry too much about the critique. If you think you are getting picked on, just go over and read the thread about tape on a pitot tube. 
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I'd rather be fishing with Andy and Opie
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