From Airbus regarding the fix for these affected aircraft:
A318/A319/A320/A321 A/C fitted with digital AMU:
• SB A320-23-1283 (Mod. 31296)
• SB A320-23-1258 (Mod. 34669)
• SB A320-23-1310 (Mod. 36518)
In case of a DC essential Bus loss, the digital AMU is no longer powered.
Consequently all radio and cockpit PA communications are lost.
AMU power supply has been modified to keep communications means even in case of DC essential Bus loss (Mod. 37782):
- SB A320-23-1333
Last edited by tom775257; 4th Feb 2013 at 15:28.