banner
banner

16 Sep 2021, 07:20 [ UTC - 5; DST ]


Greenwich AeroGroup (banner)



Reply to topic  [ 22 posts ]  Go to page 1, 2  Next
Username Protected Message
 Post subject: Electrical Problem Cessna 182
PostPosted: 06 May 2021, 22:01 
Offline


User avatar
 Profile

Joined: 11/09/09
Posts: 2267
Post Likes: +2351
Location: KHII & KREI
Aircraft: RV6A, C182M
So, tonight Michelle and I loaded up the dogs and our bags in the 182 and departed for Lake Havasu. Shortly after leaving the pattern I heard a slight pop in my headset and looked down and the STEC 30 autopilot was locked up and I thought that was odd. I turned it off and rebooted it and it rebooted fine. Then I looked up and noticed that the alternator charging gauge was on zero. I looked down and saw that the 60 amp alternator breaker was kicked so I started a return to the airport to land. (Homie don't reset breakers in the air... ;) ) After we landed I tried to reset the breaker and it kicked back out right away. I shut off the avionics master switch as well as the autopilot and tried to reset the alternator breaker and no joy. I shut off the master switch and reset the alternator breaker but it tripped again when I switched on the master switch. If I'm thinking right I may have a short on the buss or shorted winding's in the alternator? :scratch:

Anyway, we're back on the ground at home enjoying a margarita and will tackle it in the morning with my mechanic. My slogan has always been that I don't need to be some where that bad. :rofl:

Dave


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 06 May 2021, 22:20 
Offline


 Profile

Joined: 10/07/18
Posts: 1418
Post Likes: +865
Location: Columbus, Ohio
Aircraft: Baron 58, Lear 35
Shorted alternator or a short on the big cable between the alternator and the buss.


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 07:34 
Online


User avatar
 Profile

Joined: 12/03/17
Posts: 5865
Post Likes: +5170
Location: Asheville, NC
Aircraft: Lancair LNC2
Wherever the short is, it has to be downstream of the circuit breaker.


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 07:44 
Offline



User avatar
 WWW  Profile

Joined: 12/09/07
Posts: 16358
Post Likes: +10691
Location: Cascade, ID (U70)
Aircraft: C182 and PA-12
Good decision making!

:thumbup:

_________________
"Great photo! You must have a really good camera."


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 08:36 
Online




 Profile

Joined: 09/04/09
Posts: 6207
Post Likes: +2686
Location: Doylestown, PA (KDYL)
Aircraft: 1979 Baron 58P
What Paul said....my money is on a shorted cable.

_________________
Rick Witt
Doylestown, PA
& Destin, FL


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 08:57 
Offline


User avatar
 Profile

Joined: 11/09/09
Posts: 2267
Post Likes: +2351
Location: KHII & KREI
Aircraft: RV6A, C182M
Username Protected wrote:
What Paul said....my money is on a shorted cable.


Or possibly an internal short in the master switch? :shrug:

Dave


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 09:35 
Offline


User avatar
 Profile

Joined: 08/01/10
Posts: 1565
Post Likes: +532
Company: Bravos Aviation
Location: Hayward, California
Aircraft: J 35 Bonanza T/Tanks
Check connections on back off the Alt. Maybe a loose or grounding output wire..

_________________
1st Air Cav. S. Viet Nam 10/68-10/69


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 09:36 
Offline


User avatar
 Profile

Joined: 08/25/14
Posts: 93
Post Likes: +26
Location: Kindred ND (K74)
Username Protected wrote:
What Paul said....my money is on a shorted cable.


Or possibly an internal short in the master switch? :shrug:

Dave


The alternator circuit in the master switch is protected by the 5A "Alt Field" breaker, the 60A breaker is just for the large lead and the alternator itself.

Please login or Register for a free account via the link in the red bar above to download files.

_________________
Odegaard Aviation LLC
Aircraft Restoration & Repair


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 10:21 
Online


User avatar
 Profile

Joined: 12/03/17
Posts: 5865
Post Likes: +5170
Location: Asheville, NC
Aircraft: Lancair LNC2
Username Protected wrote:
the 60A breaker is just for the large lead and the alternator itself.
That schematic was helpful. So if the 60A breaker is blowing, the fault must be downstream of that, which eliminates anything on the alternator itself, or the large wire to the breaker. Just sayin'...


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 10:37 
Offline


User avatar
 Profile

Joined: 08/25/14
Posts: 93
Post Likes: +26
Location: Kindred ND (K74)
Username Protected wrote:
the 60A breaker is just for the large lead and the alternator itself.
That schematic was helpful. So if the 60A breaker is blowing, the fault must be downstream of that, which eliminates anything on the alternator itself, or the large wire to the breaker. Just sayin'...


The question is, which way is downstream? If the lead is shorting somewhere the breaker will protect it, the battery will provide more amperage than the alternator.
_________________
Odegaard Aviation LLC
Aircraft Restoration & Repair


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 11:11 
Offline




User avatar
 Profile

Joined: 12/12/07
Posts: 7147
Post Likes: +2156
Location: Dallas, TX (KADS)
Aircraft: 1969 Bonanza V35A
Look first at places where wires are adjacent to grounded metal parts - repetitive vibration wearing a hole through the insulation of the wire. Note, also, that it need not be a "big" wire to trip that breaker, but rather, any wire connected to the hot side.

Special places to look are anyplace a wire comes through a bulkhead (like the firewall) - grommets wear out over time, and the sheet metal becomes a vibrating knife.

One other "dark horse" candidate would be a screw or other metallic bit of detritus falling down and bridging between the bus and the panel / structure.

_________________
PP, ASEL, Instrument Airplane, A&P
Texas Construction Law: http://www.TexasConstructionLaw.com


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 11:59 
Online


User avatar
 Profile

Joined: 12/03/17
Posts: 5865
Post Likes: +5170
Location: Asheville, NC
Aircraft: Lancair LNC2
Username Protected wrote:
The question is, which way is downstream?
You make a good point. A circuit breaker is bi-directional so I guess it's possible for the ALT breaker to trip if the battery were connected to the buss and there was a short between the circuit breaker and the alternator. In theory, the diodes in the alternator would isolate the internals of the alternator. Does a C-182 have a split master switch so the battery can be connected to the buss but not the alternator? That might be a good troubleshooting step.


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 12:24 
Offline


 Profile

Joined: 10/07/18
Posts: 1418
Post Likes: +865
Location: Columbus, Ohio
Aircraft: Baron 58, Lear 35
Just like the diagram shows, the output of the alternator is always connected to the buss. You can take the master switch out and throw it in the trash and the alternator will still be connected to the buss. When the OP turns on the master switch, battery power is applied to the buss, through the circuit breaker and out the big wire to the alternator. With the engine not running, the alternator isn’t outputting any power TO the buss.


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 13:34 
Online


User avatar
 Profile

Joined: 12/03/17
Posts: 5865
Post Likes: +5170
Location: Asheville, NC
Aircraft: Lancair LNC2
Well Dave, you can always do what I used to do as an electronic tech back in the day. When we'd get a circuit board with a dead short on the power buss that we couldn't find, we had a desperation move. We'd hook a car battery across the buss and whatever the problem was - usually a solder whisker - just went away in a puff of smoke. Sometimes, though, the results were spectacular :rofl:


Top

 Post subject: Re: Electrical Problem Cessna 182
PostPosted: 07 May 2021, 13:42 
Online


 WWW  Profile

Joined: 08/24/13
Posts: 5114
Post Likes: +1956
Company: Aviation Tools / CCX
Location: KSMQ New Jersey
Aircraft: TBM700C2
Username Protected wrote:
Well Dave, you can always do what I used to do as an electronic tech back in the day. When we'd get a circuit board with a dead short on the power buss that we couldn't find, we had a desperation move. We'd hook a car battery across the buss and whatever the problem was - usually a solder whisker - just went away in a puff of smoke. Sometimes, though, the results were spectacular :rofl:


I've actually done that many years ago! Was usually a big pcb with lots of TTL. One of them is shorted, but which one? Put 5V on it from a power supply and the bad one explodes.

Nowadays we just see which one is getting warmer than the others, no need to risk melting tracks.


Top

Display posts from previous:  Sort by  
Reply to topic  [ 22 posts ]  Go to page 1, 2  Next




You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  

Terms of Service | Forum FAQ | Contact Us

BeechTalk, LLC is the quintessential Beechcraft Owners & Pilots Group providing a forum for the discussion of technical, practical, and entertaining issues relating to all Beech aircraft. These include the Bonanza (both V-tail and straight-tail models), Baron, Debonair, Duke, Twin Bonanza, King Air, Sierra, Skipper, Sport, Sundowner, Musketeer, Travel Air, Starship, Queen Air, BeechJet, and Premier lines of airplanes, turboprops, and turbojets.

BeechTalk, LLC is not affiliated or endorsed by the Beechcraft Corporation, its subsidiaries, or affiliates. Beechcraft™, King Air™, and Travel Air™ are the registered trademarks of the Beechcraft Corporation.

Copyright© BeechTalk, LLC 2007-2021

.carpenter-85x50.png.
.ei-85x150.jpg.
.Latitude.jpg.
.avidyne-85x50-2017-11-22.jpg.
.dbm.jpg.
.wat-85x50.jpg.
.jandsaviation-85x50.jpg.
.Genesys_85x50.jpg.
.airpower-85x50.jpg.
.McPeck_85x50.jpg.
.ABS-85x100.jpg.
.SierraTrax_85x50.jpeg.
.kadex-85x50.jpg.
.airmart-85x150.png.
.SCA.jpg.
.heartlandsm.jpg.
.aircraftassociates-85x50.png.
.blackhawk-85x100-2019-09-25.jpg.
.instar.jpg.
.cav-85x50.jpg.
.priori-85x50.jpg.
.chairmanaviation-85x50.jpg.
.Expert_Aircraft_Solution_85x50.jpg.
.planelogix-85x100-2015-04-15.jpg.
.AAI.jpg.
.tat-85x100.png.
.temple-85x100-2015-02-23.jpg.
.tempest.jpg.
.methodseven-85x50.jpg.
.traceaviation-85x150.png.
.greenwich-85x50-2020-08-10.jpg.
.midwest2.jpg.
.bpt-85x50-2019-07-27.jpg.
.saint-85x50.jpg.
.avionwealth-85x50.png.
.pdi-85x50.jpg.
.MountainAirframe.jpg.
.avfab-85x50-2018-12-04.png.
.avionicssource-85x50.jpg.
.bkool-85x50-2014-08-04.jpg.
.westsky.jpg.
.Flaremeter_85x50_v2.png.
.aerocrafter-85x50.png.
.dshannon.jpg.
.stanmusikame-85x50.jpg.
.kingairacademy-85x100.png.
.geebee-85x50.jpg.
.Wentworth_85x100.JPG.
.daytona.jpg.
.dynon-85x50.jpg.
.Davis_Aviation_85x50.jpg.
.CiESVer2.jpg.
.xnaut-85x50.jpg.
.concorde.jpg.
.Aspen_85x100_2021.jpg.
.southseas-85x50-2021.png.
.komn-85x50.png.
.STLAir_85x50.jpg.
.EagleFuelCellsTriple.jpg.
.garmin-85x200-2021-07-26.jpg.
.aviationdesigndouble.jpg.
.Foreflight_85x50_color.png.
.echelon-85x50.png.
.jaair-85x100.jpg.
.centex-85x50.jpg.
.Microkit_85x50.png.
.kingairdom.jpg.
.Rocky-Mountain-Turbine-85x100.jpg.
.jetacq-85x50.jpg.
.KalAir_Black.jpg.
.Marsh.jpg.
.camguard.jpg.
.wilco-85x100.png.
.ps_engineering.gif.
.gallagher_85x50.jpg.