LMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6 Posted (7 years 11 months 2 weeks 3 days 11 hours ago) and read 2721 times:
One of our A320's has an annoying fault. The IFE audio resets itself around 3-5 times in the space of a couple of hours. It is only off for a few seconds, then the chanel selector defaults to Ch3. If you are listening to another chanel you will need to re-select it again. The reading lights do the same thing.
Any tech people can tell why this happens as our technicians are baffled.
AvionicMech From United Kingdom, joined Jan 2005, 315 posts, RR: 3
Reply 2, posted (7 years 11 months 2 weeks 3 days 7 hours ago) and read 2678 times:
My first guess would be to look at any relays that power both the audio and reading light system and possibly change them. It could be that they are overheating causing them to 'relax' every 20 mins or so.
If it is a MAS system then I would look at the power to the Column Timer Decoder because that is what controls the PSUD's (in the overhead controlling the reading lights) and it also distributes the power to the SEB's (Seat Electronics Box).
But without having a wiring diagram it is also impossible to diagnose an aircraft system because they are all so very different.
Several possibilities here. There might be a keyline going to the Main Multiplexer, which makes it reset the SEBs (power interrupt).
Or simply, the Main Mux (which should be distributing power to the SEBs) needs to be replaced.
However, if the reading light are also affected, I would suspect the CIDS to be impacted as well. I would assume the cabin lights are also flickering. I know there are some issues with the IDGs and the A/C bus 2, but it should have been fixed by now.
Maybe you can ask your development/avionics people to contact Airbus customer support, that would be a first start!
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KELPkid From United States of America, joined Nov 2005, 6346 posts, RR: 3
Reply 7, posted (7 years 11 months 2 weeks 1 day 4 hours ago) and read 2385 times:
When you find the solution, be sure to let UA know...on my last trip with them (about a month ago), thier IFE was doing the same (A319 outbound, A320 coming back), it kept interrupting me listening to the flight deck on Ch. 9
Celebrating the birth of KELPkidJR on August 5, 2009 :-)