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AIC-25 ICS issue


joshdegroa
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Hello all.

Were having an issue with our ICS system on our planes. We have Navy C-130T's BUNO# 164995 that just got back from mod and all stations are weak when they transmit on ics. Hot mic, Call, and the radios all work 4.0. These are downing our birds and we can not figue out what the issue is. Does anyone have any ideas?

Thanks!!

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Pull one CBer and see if the other stations clear up... If not reset 1st CB and pull the other to see if the issue clears. You may be able to isolate to one CB if not remove the cannon plugs (transmitter select and radio select panels) station by station and see if you can isolate it that way.

More than one aircraft has this issue? If so look at the MOD and see where it ties into the ICS there may be wires on the wrong terminal (would not be the first time....)

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Try seperating the audio common wiring going into the comm boxes. This line is what all of your audio is traveling on. There should be a break at FS245 to separate the flight deck from the cargo compartment. The easy way to resolve this issue is to just diconnect one box at a time from the IJB. Depending on what Mod has been performed, If they tied into this audio common wire you could see some resistance to ground on the wire.

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  • 1 month later...

I have seen way too many issues with audio lines after TCTOs and Mods. Like kersey said, check all common audio lines. I always remove them and do ohm checks to ground. Put one back on and see how the audio sounds, then keep adding them. Usually, the culprit is an over aggressive shield splice/termination.

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