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One FD off
The FD bars no longer appear on the associated PFD
The corresponding FD is disengaged.
Both FDs off:
The FD bars disappear from both PFDs.
If no AP was engaged, lateral and vertical modes disengage. The A/-rHR, if active,
automatically reverts to (or remains in) SPEED/MACH mode.
If one AP was engaged when FDs are switched OFF, this AP remains engaged in the
active modes but the FDs are no longer displayed.
SPE~THR
CAPT PFD
NO AP ENGAGED
A/THR ACTIVE
AUTOMATIC FLIGHT DIRECTOR DISENGAGEMENT
SPE~THR
F/O PFD
f one FD fails or one FMGC is not valid, both PFDs display the remaining FD
CAPT PFD
/ \\
/ \\
F/O PFD
┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃                                ┃                            ┃1.22.30     P 6       ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  ~-~ A318                     ┃l          AFLIGHTIGUIDANCE ┃SEQ 100 1 ┃I REV 29  ┃
┃ aw aw ,, ~e~ A319              ┃                            ┃          ┃          ┃
┃ Lli,~ A320                     ┃                            ┃          ┃          ┃
┃      A~7-~'M" A321             ┃                            ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                            ┃          ┃          ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━━┻━━━━━┻━━━━━┛
AUTOMATIC DISENGAGEMENT DUE TO SPEED PROTECTION
When APs are not engaged and the pilot does not follow the FD bars to maintain the
commanded trajectory, in climb with CLB or OP CLB, (or EXP CLB <~]) engaged or in
descent with DES or OP DES (or EXP DES <~]) engaged the FDs will disengage at the
activation of the automatic speed mode protection.
Refer to FCOM 1.22.30 AUTOMATIC SPEED MODE PROTECTION for the conditions of
activation.
AUTOMATIC FD REMOVAL
The FD pitch bar is removed when no vertical mode is engaged or when ROLL OUT is
engaged.
The roll FD bar is removed when no lateral mode is engaged or when the RWY or ROLL
OUT mode is engaged.
Both FDs are removed when the aircraft pitch exceeds 25~ up or 13~ down, or bank
angle exceeds 45~.
Note: If from AP/FBs off, FD2 then FDI, are engaged within 180 milliseconds (one
       computation cycle), a flip flop of master FMGC may occur.
       As a result, no vertical mode engages, the FMA Ist column, Ist line (A/THR mode)
       is blank, or displays dashes.
       Engaging V/S mode manually reselects the correct FMGC and restores the display.
FD WARNINGS
┏━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃FD WARNINGS                               ┃CONDITIONS                                        ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(21)