My favorite would be to recheck the wiring close to where you found the
broken wire. You may have disturbed more than one.
AlanB
#303
----- Original Message -----
From: "Bob Harrison" <ptag.dev@ukonline.co.uk>
Subject: Flap Position Indicator Problem ! Help required.
> Hi! Instrumentation /Electrical experts.
> I have a Mac Position Indicator attached to my flaps with red, green and
> blue wires connected to an LED Indicator separately circuited and fused
> from the flap drive motor.
> It has worked flawlessly for 18 months until last week when I needed to
> access the rear of the panel to fix an auxillary socket for a hand held
> Garmin 295. Obviously there is no relationship between the two but since
> then the LED flap indicator stays at 0 deg. I checked out my connectors
> where I had been working and found the blue LED wire broken.
> Having now repaired the connection it, the LED, stays on 0 deg
irrespective
> where the flaps are positioned.
>
> I have taken some resistance readings near to the MAC deck as follows: -
>
> With Flaps 30deg :- blue wire to orange 4.86 ohms
> (down) blue wire to green 15.00 ohms
> green Wire to orange 4.86 ohms
>
> With Flaps 25deg :- blue wire to orange 4.85 ohms
> blue wire to green 613 ohms
> green wire to orange 4.27 ohms
>
> with Flaps 15deg :- blue wire to orange 4.86 ohms
> blue wire to green 1587 ohms
> green wire to orange 3.29 ohms
>
> With Flaps 7deg :- blue wire to orange 4.84 ohms
> blue wire to green 2891 ohms
> green wire to orange 2018 ohms
>
> with Flaps 0 deg:- blue wire to orange 4.84 ohms
> (up) blue wire to green 4.80 ohms
> green wire to orange 52.5 ohms
>
> Can anyone deduce from the readings where I should look to reactivate the
> LED to match the
> actual flap position?
>
> Your urgent consideration of this would be gratefully received since in
> seven days time I'm joining a group on a France Fly round and would like
to
> get it fixed ASAP.
>
> BTW the Trim LED alongside is working AOK.
>
> Regards
> Bob Harrison G-PTAG.
>
>
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