A320 ADR 1 fail and GPWS
Hi,
Forgive me please for this basic question which appears to be confusing a few 320 pilots.
If you have an ADR 1 failure, then you switch the system so that Captain's displays get information from ADR 3. ADR 1 feeds into EGPWS and GPWS functions.
Some airlines appear to be switching off GPWS TERR, some GPWS SYS and some both at this point.
So, what does ADR 1 feed? Why do I lose the GPWS rad alt fed functions if ADR 1 fails, or does ADR 1 feed in rad alt information to GPWS. Why do I lose the Glideslope function with ADR 1?
Sorry, but I do not have access to the manuals, merely extracts at the moment. I think I will go back to the P1 compass and a DHC1 shortly.