I noticed that on two add-on planes (RealAir Cessna 172 and a Cessna 150) that my flaps were raising and lowering silently.
I found there were no sound files for flaps in the aircraft/sounds file so added a Cessna 182 sound file for flaps.
Can someone point me to a line of text in the CFG file that would give the command to the sound file ? There are two possibilities that (1) these planes never had sound for the flaps or (2) more likely, that at some stage they have "disappeared themselves ." as seems to happen to me occasionally.