I agree with AZWoody. Adding a switch or shunt to the ematch adds another
failure point to the system. If you want a switch, add it where it will
the most good - to power your alt off and on. A voltage selector switch
from a computer power supply is my favorite switch to use for that
Adding a shunt does not prevent stupid mistakes (wrong battery polarity,
etc), but adds one more possible stupid mistake.
I for one, when preping a bird with electronics, will tie yellow "caution"
tape on the bird. Once the bird is on the pad, and the electronics are
armed, the tape comes off. (prevents not arming the electronics)
The reason I do this, is that from the flight line, I can tell of the
"proper steps" were taken.
Also, one thing that I do is to do a "test arming" of the electronics
prep. Prior to any BP being anywhere near the ematch. Worst case is the
ematch might pop if theres a problem, but can be done in a way to not
present a safety issue.
Gentlemen I agree with both of you. I use an on/off switch only to power up
the electronics. I have even gone so far as to eliminate the terminal board
on the electronics bay bulkheads. I run the ematch wires directly to the
boards, no junctions. Where the ematch wires penetrate the bulkheads I seal
them using a fender washer with a soft rubber washer under it. This has
worked so far and I have not noticed any evidence of ejection gas in the
William Richardson ENC USNR Ret.
TRA 8703 L2
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