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FLIGHT CREW CHANGE OF FCU ALT TARGET ▸ ACTIVE VERTICAL MODE NOT POSSIBLE
FCU change resulting reversion to VS mode
 
This reversion to the V/S (FPA) mode on the current V/S target does not modify the pitch behaviour of the aircraft.
It is the flight crew's responsibility to change it as required.
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:
 

  OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

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.
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):
 

  OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

reversion to speed mode
 
AP, FD, A/THR MODE CHANGES AND REVERSIONS
Criteria: P4320, SA
7 Applicable to: MSN 1668-4078
INTRODUCTION
The flight crew manually engages the modes.
However, they may change automatically, depending on the:
? AP, FD, and A/THR system integration
? Logical sequence of modes
? So-called "mode reversions".
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):
　
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本文鏈接地址：A318/A319/A320/A321 機組訓練手冊 FCTM Flight Crew Training Manual(28)