OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
AP, FD, ATHR SYSTEM INTEGRATION
There is a direct relationship between aircraft pitch control, and engine thrust control. This
relationship is designed to manage the aircraft’s energy.
? If the AP/FD pitch mode controls a vertical trajectory (e.g. ALT, V/S, FPA, G/S):
A/THR controls speed
? If the AP/FD pitch mode controls a speed (e.g. OP CLB, OP DES):
A/THR controls thrust (THR CLB, THR IDLE)
? If no AP/FD pitch mode is engaged (i.e. AP is off and FD is off):
A/THR controls speed
Therefore, any change in the AP/FD pitch mode is associated with a change in the A/THR mode.
Note: For this reason, the FMA displays the A/THR mode and the AP/FD vertical mode columns next to each other.
THE LOGICAL SEQUENCE OF MODES
In climb, when the flight crew selects a climb mode, they usually define an altitude target, and expect the aircraft to capture and track this altitude. Therefore, when the flight crew selects a climb mode, the next logical mode is automatically armed.
For example:
AP/FD mode capture and tracking (1)
The flight crew may also manually arm a mode in advance, so that the AP/FD intercepts a defined trajectory.
Typically, the flight crew may arm NAV, LOC-G/S, and APPNAV-FINAL. When the capture or tracking conditions occur, the mode will change sequentially.
AP/FD mode capture and tracking (2)
These logical mode changes occur, when the modes are armed. They appear in blue on the FMA.
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
MODE REVERSIONS GENERAL
Mode reversions are automatic mode changes that unexpectedly occur, but are designed to ensure coherent AP, FD, and A/THR operations, in conjunction with flight crew input (or when entering a F-PLN discontinuity).
For example, a reversion will occur, when the flight crew:
? Changes the FCU ALT target in specific conditions
? Engages a mode on one axis, that will automatically disengage the associated mode on the other axis
Due to the unexpected nature of their occurrence, the FMA should be closely-monitored for mode reversions.
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