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Noise Problem. Both Comms Breaking Squelch
Would anyone have an idea about the cause of this?
Problem: Intermittent noise (sounds just like a squelch volume test) on both communication radios. Lasts from 15 seconds to two minutes. Will occur at any RPM including idle. Changing frequencies eliminates the noise but the noise can and most likely will come back shortly on that same frequency. I have a back up alternator on this aircraft and when I have the main alternator turned off to check the operation of the backup alternator, the noise never seems to occur. Also, when the noise manifests, if I turn off the alternator the noise always goes away. I have done this several times on the ground and it has been 100%. The voltage regulator has just been replaced and the noise is still present. The alternator has been rebuilt three times in the last 30 hours of operation. The alternator shop is tired of hearing from me. This squelch break noise is new however in the last 15 hours of operation. The alternator has been having so much trouble because we have been trying to locate an alternator field circuit breaker popping issue. Typical scenario is the aircraft must fly for at least 40 minutes before the breaker will pop. Usually, it pops in conjunction with a small static crack in the headset and a voltage excursion of one to two volts. This most often happens in level flight. This same voltage excursion has been noted at least once when the main alternator is turned off and running on the backup alternator. All connections in the alternator/breaker/battery/ground circuit have been cleaned, tightened and cable ends replaced when suspect. All to no avail. This is a 24 volt single battery system. Running the 35 amp hydraulic pump to actuate flaps or gear will on occasion trigger a field alternator breaker pop but many times it won't either. Thanks in advance for any light you might be able to shine on this problem. |
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