FMGC logic as explained in Auto flight:
1. Whichever AP is ON that FMGC is master.
2. If both APs are on FMGC1 is master.
3. If AP is off and FD1 is ON FD1 is master.
4. In flight FDs are switched off together to put ATHR in speed mode. It may be done one by one but some airlines prefer one person doing them. Yes that was one reason the crash could have been avoided. Reset of FMGC should be done one at a time.
5. By manually setting higher speed means amending Vapp in MCDU strong winds is recommended between 5 to 15KTS but increasing because it is close to Vls is an individual idiosyncrasy. GS mini will only come in ifexperienced head wind is higher than reported tower wind.
Last edited by vilas; 25th Oct 2015 at 23:54.