---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Fri 07/03/09: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:41 AM - Flashing beacon / tail strobe. (teamgrumman@AOL.COM) 2. 10:55 AM - Cowling question (teamgrumman@AOL.COM) 3. 02:06 PM - Re: Flashing beacon / tail strobe. (flyv35b) ________________________________ Message 1 _____________________________________ Time: 10:41:47 AM PST US Subject: TeamGrumman-List: Flashing beacon / tail strobe. From: teamgrumman@AOL.COM I've been maintaining this particular Cheetah for about 4 years now. =C2 -One of the original complaints was that the flashing beacon wouldn't co me on right away. =C2-All of the connections were cleaned and it seemed to work fine. =C2-I really never duplicated the problem. =C2- A few years ago, the owner had the power supply changed: =C2-Problem sol ved again. =C2-For a while. Last year the beacon was again intermittent. Installed a new bulb: =C2-P roblem solved again. =C2-For a while. A few months ago, I installed a separate power supply and bulb: =C2-Noth ing. So, we decided to bypass the whole flashing beacon thing and install a tai l strobe. =C2-Problem solved again. That is, until the owner came to pick up the plane. =C2-Now, keep in min d, I had just checked the tail strobe for the umpteenth time and it WAS wo rking. =C2-But, it didn't when the customer showed up. =C2-I pulled th e ELT cover and immediately checked voltage at the input to the strobe pow er supply: 2.56 volts. =C2-"That's impossible. =C2-I just checked that voltage a few hours earlier and it was 12 volts." =C2-(I had also measu red 12 volts during the bulb and beacon power supply swap a few months ear lier.) I pulled the fuse and checked: =C2-12 volts. I shorted the switch out measure the voltage: 12 volts. 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. =C2-I gave that wire a tug and it came out. =C2-It was all corr oded and burned looking. =C2-It looked like it had corroded through. =C2 -I cut and spliced the burned sections and the strobe worked. =C2- I have only seen this once before many years ago. =C2-It was the pitot at that time.=C2- ________________________________ Message 2 _____________________________________ Time: 10:55:08 AM PST US Subject: TeamGrumman-List: Cowling question From: teamgrumman@AOL.COM I wonder if all of you out there in Team-Grumman land would do me a favor. =C2- I'm in the process of fitting a cowling to a plane. =C2-The initial fitt ing seemed to be more difficult than usual, or as expected. =C2-Upon clo se inspection, two of the engine mount bushings/isolators were not the cor rect parts. =C2-I ordered all new=C2-bushings/isolators. =C2-Upon in stallation, the lower left mount had been installed totally wrong. =C2- After installing the new=C2-bushings/isolators, the cowling fit better, but, it seemed like the cowling was WAAAAY too long for the scribe marks on the cowling. =C2-(to where the cowling should be trimmed.) =C2-Wel l, by a good quarter of an inch anyway. So, I measured my plane: =C2-40 inches from the back of the cowling to the back of the spinner. =C2-The plane I was installing the cowling mea sured 39 3/4 inches. =C2- So, I drove around the airport and measured two other Grummans. =C2-Both were 39 3/4 inches. =C2-So, I measured the distance from the firewall to the engine mount on all of the available Grummans. =C2-The engine mo unt on my plane is 1/4 inch further from the firewall than the others. So, if you could do me a favor and measure the distance from the back of the cowling hinge to the back of the spinner I would appreciate it. =C2 -It's important that I know what the installed distance is for trimming the cowling. Please post to Team-Grumman. =C2-Thanks. ________________________________ Message 3 _____________________________________ Time: 02:06:22 PM PST US From: "flyv35b" Subject: Re: TeamGrumman-List: Flashing beacon / tail strobe. I recently had a flashing beacon that was in-op due to a fried connector ba ck near the ELT. These Molex or Amphenol connectors are marginal for the h igh load items like the beacon and pitot heat IMO. Cliff ----- Original Message ----- From: teamgrumman@aol.com To: teamgrumman-list@matronics.com Sent: Friday, July 03, 2009 10:39 AM Subject: TeamGrumman-List: Flashing beacon / tail strobe. 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 r ight 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: Probl em 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 ta il 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 v olts. =22That's impossible. I just checked that voltage a few hours earlier and it was 12 volts.=22 (I had also measured 12 volts during the bulb and b eacon 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 look ing. 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 th at time. --------------------------------------------------------------------------- --- An Excellent Credit Score is 750. 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