Doug G. Posted July 17, 2014 Report Posted July 17, 2014 I understand that if I were renting this would be a good thing, and fortunately the Dynon has a Hobbs built in, but, my mechanical gauge only read .1 hr. today on a 1.5 hr flight. Is there anything I should know about getting a replacement Hobbs meter. I haven't found it in the manuals. Thanks.
CT4ME Posted July 17, 2014 Report Posted July 17, 2014 I remember reading here about some odd connection between the ALT alert light and the hobbs. If the ALT light is out, the hobbs won't work (or something similar).... possibility?
Anticept Posted July 17, 2014 Report Posted July 17, 2014 That is correct. If the alternator is not on, or the bulb is burned out, the hobbs will not function.
Doug G. Posted July 17, 2014 Author Report Posted July 17, 2014 I'll double check, but this was a slow death. I started suspecting it was not accurate a while back, but then it seemed OK for a couple of flights. Then yesterday it only moved 1/10 hr. in 1½ hrs. I am hoping the Honeywell unit from Aircraft Spruce will work, but will call FD today and use the Dynon until I get the replacement.
Anticept Posted July 17, 2014 Report Posted July 17, 2014 Could be the voltage regulator dying too. Doubt it, but the circuit does require a functional regulator.
Doug G. Posted July 24, 2014 Author Report Posted July 24, 2014 Hobbs replaced and functioning well. (Simplest repair yet -- with the exception of tightening the screw on the little pop open window to keep it from opening on its own - that was my only in flight repair. )
Doug G. Posted March 28, 2015 Author Report Posted March 28, 2015 An update...My new Hobbs meter quit at 28 hrs. This was the third one on this plane so I thought it has to be electrical. I hooked it up to 12 volts and it worked just fine. Then, just for fun I hooked up the one I replaced and it worked just fine. All the wires seemed to be in good shape and the connectors were tight. Next thought was the "generator" light bulb, so I pulled the holder and tested the bulb in the holder... no jjoy. So, I thought I had found the problem. I then found the bulb was the screw in type (actually didn't expect that, I had noticed it was loose but figured it was at the end of some wires). I took it out and tested it. It was fine. Screwed it back in tight and the end result was a working Hobbs! ☺ The other lap was loose also. If anyone needs a Hobbs meter - I have a spare.
2FlyAgain Posted April 2, 2015 Report Posted April 2, 2015 Ok, loose lamp bulbs... I will add that to my list of electrical gremlins. Doug, thanks for passing this along. Does anybody know the electrical system well enough to offer an educated guess as to what other electronics may "play dead" if there is a loose lamp bulb...? Thanks in advance!!
Doug G. Posted April 2, 2015 Author Report Posted April 2, 2015 Price? And who makes it? I will check on the make when I get back to the hangar, and give you a price. I honestly didn't think anyone would be interested.
Anticept Posted April 2, 2015 Report Posted April 2, 2015 It depends on who makes it. I need to retrofit a mooney with one. It must be TC'ed.
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