C-47 Fire Detection

Obergrafeter · **Posted:** Tue Feb 12, 2013 4:19 pm

Help!! Does anyone have a wiring diagram for the Fire Detection Loop on a C-47. Last squawk before she is finished!! Help!

The Inspector · **Posted:** Tue Feb 12, 2013 7:08 pm

Obergrafeter wrote:

Help!! Does anyone have a wiring diagram for the Fire Detection Loop on a C-47. Last squawk before she is finished!! Help!

It's a simple wire inside a shielded covering setup, check for current flow on the inner wire using a meter, power runs on the inner wire and the shielding is your ground path, then check the run by hand/eyeball for kinks or tight bends, the loop works off of the inner wire stretching in a high heat situatiuon and grounding itself against the outer shielding, so if you have a kink or ding in the outer shield or a sharp bend, there's your fault. The loops are actually pretty cheap if you have to replace one. Be glad it's not a newer Sistron-Donner system.

The Inspector · **Posted:** Tue Feb 19, 2013 2:54 pm

The Inspector wrote:

Obergrafeter wrote:

Help!! Does anyone have a wiring diagram for the Fire Detection Loop on a C-47. Last squawk before she is finished!! Help!

It's a simple wire inside a shielded covering setup, check for current flow on the inner wire using a meter, power runs on the inner wire and the shielding is your ground path, then check the run by hand/eyeball for kinks or tight bends, the loop works off of the inner wire stretching in a high heat situatiuon and grounding itself against the outer shielding, so if you have a kink or ding in the outer shield or a sharp bend, there's your fault. The loops are actually pretty cheap if you have to replace one. Be glad it's not a newer Sistron-Donner system.

"AAAAAANNNNNNDDDDDDD?? what is/was the resolve?"

Obergrafeter · **Posted:** Tue Feb 19, 2013 6:57 pm

The info helped, but the main problem was the "push to test" lamp. Needed a new one as the receptacle was corroded, but finding one became the problem. Think we got it resolved finally. Just know you don't want those extinguishers going off prematurely ..... over a grand to fill them!!

The Inspector · **Posted:** Tue Feb 19, 2013 8:40 pm

Obergrafeter wrote:

The info helped, but the main problem was the "push to test" lamp. Needed a new one as the receptacle was corroded, but finding one became the problem. Think we got it resolved finally. Just know you don't want those extinguishers going off prematurely ..... over a grand to fill them!!

Glad to hear you managed to track the culprit down-

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C-47 Fire Detection

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