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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Fri Jul 03, 2009 9:41 am Post subject: Flashing beacon / tail strobe. |
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I've been maintaining this particular Cheetah for about 4 years now. One of the original complaints was that the flashing beacon wouldn't come on right away. All of the connections were cleaned and it seemed to work fine. I really never duplicated the problem.
A few years ago, the owner had the power supply changed: Problem solved again. For a while.
Last year the beacon was again intermittent. Installed a new bulb: Problem solved again. For a while.
A few months ago, I installed a separate power supply and bulb: Nothing.
So, we decided to bypass the whole flashing beacon thing and install a tail strobe. Problem solved again.
That is, until the owner came to pick up the plane. Now, keep in mind, I had just checked the tail strobe for the umpteenth time and it WAS working. But, it didn't when the customer showed up. I pulled the ELT cover and immediately checked voltage at the input to the strobe power supply: 2.56 volts. "That's impossible. I just checked that voltage a few hours earlier and it was 12 volts." (I had also measured 12 volts during the bulb and beacon power supply swap a few months earlier.)
I pulled the fuse and checked: 12 volts.
I shorted the switch out measure the voltage: 12 volts.
=0 A Then I looked at the connector next to where the pilots right knee would be and saw the connector brown and burned looking near one of the wires. I gave that wire a tug and it came out. It was all corroded and burned looking. It looked like it had corroded through. I cut and spliced the burned sections and the strobe worked.
I have only seen this once before many years ago. It was the pitot at that time.
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Gary
AuCountry Aviation
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flyv35b(at)minetfiber.com
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| Posted: Fri Jul 03, 2009 1:06 pm Post subject: Flashing beacon / tail strobe. |
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I recently had a flashing beacon that was in-op due to a fried connector back near the ELT. These Molex or Amphenol connectors are marginal for the high load items like the beacon and pitot heat IMO.
Cliff
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