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US Airways Airbus A319, A320, A321 Notes
76
Phase Triggers
I think phaser triggers belong in Star Trek but these are phase triggers. Phases
are very important and you can look at the top of the PROG and PERF pages to
see what phase you are currently in. You will better understand how the Airbus
FMGC “thinks” if you understand what triggers the phase change.
Taxi to Takeoff – Flex (if FLEX loaded in FMGC) or TOGA thrust lever
detent selection
Takeoff to Climb – Reaching the acceleration altitude loaded in the FMGC
during initialization on PERF page.
Climb to Cruise – Reaching planned cruise altitude listed on PERF page.
Cruise to Descent – Start of descent from current cruise altitude (within
200 nm of destination).
Descent to Approach – Activate and Confirm Approach on PERF DES
page. This will drive managed speed to approach speed.
Note: If the ECAM takeoff memo hasn’t yet come up on the screen during taxi
just press the T.O. CONFIG test button on the ECAM control panel. This will
force the taxi phase and the ECAM takeoff memo screen to come up.
Note: If descent is initiated before 200 nm from destination then descent will be
made in CRUISE DESCENT at 1000 fpm and will not honor any descent
crossing restrictions. The FMGC will prompt for a new cruise altitude as a
warning.
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