psiegel(at)fuse.net
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 Posted: Sun Oct 15, 2006 2:43 am Post subject: Sparky's misadventures conclude |
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Thanks to 'lectric Bob's (and others' on the list!) help, the non functioning master contactor problem has been solved!
Turns out that Mr. Cliplead revealed that when sparks flew, the jumper from the BAT terminal to the little fourth terminal on the B&C contactor had burned through, which wouldn't let electrons activate the little solenoid inside the contactor.
Installing a new jumper solved the problem!
Lesson learned...install those little rubber boots on ALL exposed "hot" terminals!
As a side note, what precipitated the problem was "weak" com radios. In an attempt to fix that, the connections for the com antenna ground plane were checked, leading to the sparks when the antenna connector flopped over onto the master contactor.
Turns out THAT problem was caused by a malfunctioning relay that regulated the access from the two com radios to a single com antenna. Both com radios had to go back for repair. When one radio transmits directly into another through a common antenna, bad things happen.
Another lesson learned...yeah it is nice to try to minimize the number of external antennae on a metal airplane for esthetic and drag reasons. But the entire point of having redundant radios to back each other up is lost when a single point failure of the necessary relay connection between the two radios and the single antenna can knock out all communications!
So THAT is why Sparky's Evo will be sporting TWO com antennae on the belly now!
Paul Siegel
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