The International Comanche Society - Pilot und Flugzeug

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ONLINE INTELLIGENCE Technically Speaking Alternator Problems The following is from a series of online postings from the Comanche’s Owner’s Forum. These postings are provided for informational purposes only. The views expressed in these postings represent the opinions of individual Comanche owners and have not been vetted by the ICS technical committee. As a responsible pilot and aircraft owner, you should always seek the advice from an experienced, trusted source, such as your A&P or CFFapproved CFI, before applying any of the techniques or recommendations presented in these postings. The postings are printed as they appeared in the Forum. Due to space considerations, we are publishing only selected posts. ––––––––––––––––––––––––––––––––––– I have a 1960 250 with an Alcor alternator conversion on it. About 15 hours ago I was doing the run up away from home and I noticed that the alternator was not showing a charge on the ammeter. We checked everything visible before we flew home (about 15 minutes away) and found nothing wrong. I pulled the alternator off and had it checked and overhauled at a local shop. After it was repaired with new brushes, new diode package and general cleanup I reinstalled it. The charging system worked excellent for about 10 hours and now sometimes the alternator will drop offline and not start charging again until I put a load on the system by turning on both landing lights on and then off. After that simple load, the alternator works great. I have checked connections for broken or loose wires with nothing found. I did talk to the folks in San Antonio and they think that it may be a bad connection also. I know this is long winded, but I am at a loss where to look. Does anybody have a suggestion? I have hooked up a digital volt meter to the outlet and confirmed the voltage when online is 14 volts and drops to 12 volts. Thanks for any help. Ed Taylor, ICS #14510 ––––––––––––––––––––––––––––––––––– During my last alternator episode, our local shop sent us back to get the voltage regulator. They tested both (alternator and regulator), together and separately. This time it was a bad regulator. Rich ––––––––––––––––––––––––––––––––––– While the connections may look good, I would suspect the wire that connects to the brushes. It is the small thin wire that goes between the regulator (marked field) and the brushes (the small tab protruding from the back of the alternator). If the end was crimped on using excessive pressure, several or all of the strands of wire could have fractured. The only thing holding everything together would then be the outside skin. This wire supplies the field voltage to the alternator. If it is intermittent, the alternator will drop offline. A simple check is to grab hold of the wire and give it a tug. If it comes apart, that’s your problem. It is the only line that can cause this problem. If the end isn’t fractured, you may want to consider replacing the entire line. It’s a good idea to make sure that the line is anchored and can’t flop around in the breeze. That can also cause the individual strands of wire to break, eventually causing a failure. Dave Gitelman ––––––––––––––––––––––––––––––––––– Inter-Av (Alcor) has a web site (www.inter-av.com/alternator.htm) with troubleshooting advice. A phone number is listed for customer support too. I hope this helps. Brian ––––––––––––––––––––––––––––––––––– Your idea is what I am really expecting to have to do. However in the mean time I was planning on installing a volt meter in the extra hole in panel and see if any thing shows in flight. Do you think that may help to see if it drops rapidly offline or [if there’s] a slow lowering of voltage before it drops offline. I have the great luck of the most odd-ball problems. Hope you are getting better. Cheers, Ed Taylor, ICS #14510 ––––––––––––––––––––––––––––––––––– Dave- I will look again at all the wires like you have suggested. Last time it was a bad connection. I thought that we had corrected all the bad crimps and bad wires. The last annual in June is when I started chasing all of these little quirks. I hope that I may have missed something. Thanks for the ideas. Cheers, Ed Taylor ––––––––––––––––––––––––––––––––––– Brian- Thanks for the contact info. I talked to one of their techs and had him suggest that he had seen a similar problem on Cessna 182 and it was the master solenoid. He said it may be the ground wire or burned contacts. When I find the problem I will let everyone know. Thanks for the ideas. Cheers, Ed Taylor ––––––––––––––––––––––––––––––––––– I think the easiest thing to do is get the regulator checked. If the regulator and alternator are both okay, all you can do is keep looking. I’m no electrical system expert, but my experiences have been with regulators and alternators. Rich ––––––––––––––––––––––––––––––––––– Continued on Page 16 14 • Comanche Flyer SEPTEMBER 2006
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Freight is FOB factory. PRICES SUBJECT TO CHANGE WITHOUT NOTICE SEPTEMBER 2006 Comanche Flyer • 15
Page 1: SEPTEMBER 2006 VOLUME 33, NO. 9 The
Page 4 and 5: Letter From The President A New ICS
Page 6 and 7: C O M A N C H E
Page 8 and 9: Now came the search for a twin. Eve
Page 10 and 11: Sharing a weekend trip with friends
Page 12 and 13: 2006-2007 ICS BOARD OF DIRECTORS &
Page 14 and 15: Technically Speaking Upgrading Supp
Page 18 and 19: Update Your Old Comanche Panel Make
Page 20 and 21: Pilot Pointers It Should Not Happen
Page 22 and 23: Upon arrival at Halstead, they land
Page 24 and 25: Flight into O’Hare Wasn’t Hairy
Page 26 and 27: ARCHES NATIONAL PARK M O AB UTAH B
Page 28 and 29: If mountain biking is not your thin
Page 30 and 31: For a place to stay, Moab has all t
Page 32 and 33: The International Comanche Society
Page 34 and 35: a great "big band" plays real dance
Page 36 and 37: There are numerous local attraction
Page 38 and 39: Fiberglass “Glareshield” One pi
Page 40 and 41: Fly-In Reports The South Central Tr
Page 42 and 43: Aircraft Interiors Standard & Custo
Page 44 and 45: Fly-In Reports continued... Southwe
Page 46 and 47: Featured Fly-In North Central Tribe
Page 48 and 49: Comanche Classified Trading Post is
Page 50 and 51: 48 • Comanche Flyer SEPTEMBER 200
Page 52: 3-BLADE COMPACT HUB PROPELLER 2-BLA

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