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OPERATIONAL PHILOSOPHY
AP / FD / ATHR
 
FLIGHT CREW HDG OR TRK MODE ENGAGEMENT ▸ DISENGAGEMENT OF ASSOCIATED MODE ON THE VERTICAL AXIS
This reversion is due to the integration of the AP, FD, and A/THR with the FMS.
When the flight crew defines a F-PLN, the FMS considers this F-PLN as a whole (lateral + vertical). :
Therefore, the AP will guide the aircraft along the entire F-PLN
? Along the LAT F-PLN (NAV – APP NAV modes)
? Along the VERT F-PLN (CLB – DES – FINAL modes).
Vertical managed modes can only be used, if the lateral managed NAV mode is used. If the flight crew decides to divert from the lateral F-PLN, the autopilot will no longer guide the aircraft along the vertical F-PLN.
Therefore, in climb:
Lateral mode change and vertical mode reversion
 
In descent:
Lateral mode change and vertical mode reversion
 
This reversion to V/S (FPA) mode on the current V/S target does not modify the pitch behavior of the aircraft. It is the flight crew’s responsibility to adapt pitch, if necessary.
THE AIRCRAFT ENTERS A F-PLN DISCONTINUITY
NAV mode is lost, when entering a F-PLN discontinuity. On the lateral axis, the aircraft reverts to HDG (or TRK) mode. On the vertical axis, the same reversion (as the one indicated above) occurs.
 
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
 
THE PF MANUALLY FLIES THE AIRCRAFT WITH THE FD ON, AND DOES NOT FOLLOW THE FD PITCH ORDERS
If the flight crew does not follow the FD pitch orders, an A/THR mode reversion occurs. This reversion is effective, when the A/THR is in THRUST MODE (THR IDLE, THR CLB), and the aircraft reaches the limits of the speed envelope (VLS, VMAX):
Reversion to speed mode
 
A/THR in SPEED mode automatically readjusts thrust to regain the target speed. The FD bars will disappear, because they are not being followed by the PF.
TRIPLE CLICK
Applicable to: ALL
The "triple click" is an aural alert. It is an attention-getter, designed to draw the flight crew's attention to the FMA.
The PFD FMA highlights a mode change or reversion with a white box around the new mode, and the pulsing of its associated FD bar.
The reversions, described in the previous paragraph, are also emphasized via the triple click aural alert.
 
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
 

 
Note: The triple click also appears in the following, less usual, cases:
? SRS ▸ CLB (OP CLB) reversion: If, the flight crew selects a speed on the FCU
? The V/S selection is "refused" during ALT*: The flight crew pulls the V/S knob, while in ALT*
? The V/S target is not followed, because the selected target is too high, and leads to VLS/ VMAX.
 
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OPERATIONAL PHILOSOPHY
　
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本文鏈接地址：A330/A340 機組訓練手冊 FCTM Flight Crew Training Manual 1(19)