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ENGAGEMENT CONDITIONS
HDG or TRK is engaged when one of the following conditions is met :
- The pilot pulls out the HDG-TRK selector knob (not sooner than five seconds after lift-off)~
- NAV is disengaged, either by the loss of the lateral flight plan or by the pilot entering
   a flight plan discontinuity~
- FINAL mode (armed or engaged) is lost when the aircraft is in APP NAV mode.
- LOC or LOC* mode is lost~
- The pilot engages the AP/FD with no other mode already engaged (basic mode of AP/FD
   engagement)~
   ~ LOC mode is armed when APP NAV FINAL were previously engaged~
DISENGAGEMENT CONDITIONS
The engagement of any other lateral mode disengages HDG or TRK
SYNCHRONIZING THE HDG/TRK WINDOW OF THE FCU
The lateral window of the FCU displays a heading or a track value when :
- The HDG/TRK mode is engaged~ The displayed value is the current HDG/TRK or the
   manually selected value of the target~
- The pilot turns the HDG/TRK selection knob~ The value in the window first synchronizes
   with the current HDG/TRK, then displays the manual selection~ It remains displayed for
   10 seconds or 45 seconds depending upon FCU standard, then vanishes if the pilot does
   not pull the knob (except in HDG preset)~
- A HDG/-rRK is preset (see below)~
- AP/FD is lost~ The value becomes that of the aircraft current heading or track~
Note : ff HOG is switched to TRK (or vice versa), the value displayed in the window
       switches from heading to track (or vice versa).
HDG/TRK PRESET
The system has a HDG/-rRK preset function for takeoff and go around~
If the pilot chooses not to fly the flight plan after takeoff or go around, he may preset a HDG
or a TRK on the FCU by turning the HDG/-rRK selector knob. The value he sets remains
displayed in the FCU HDG/TRK window until the knob is pulled~
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
┃I  -~ A318                      ┃  AUTO FLIGHT   ┃1.22.30     P 17  ┃
┃  .-,,.8, ,, ~e~ A319           ┃                ┃                  ┃
┃ Lli,~ A320                     ┃                ┃                  ┃
┃                                ┃                ┣━━━━┳━━━━┫
┃      A~7-~'M" A321             ┃FLIGHT GUIDANCE ┃SEQ 001 ┃REV 25  ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                ┃        ┃        ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━┻━━━━┻━━━━┛
Operation at takeoff
HDG/TRK preset is available before takeoff and up to 30 feet RA. Turning the HDG/TRK
selector knob before 30 feet sets the desired HDG/-FRK. As a consequence:
- NAV is disarmed
- At 30 feet, RW~ TRK is annunciated until the HDG/TRK knob is pulled~
Operation at go around
Whenever the LOC*, LOC, LAND, FINAL, or GA modes are engaged, the HDG preset is
available~ If the pilot rotates the HDG/-rRK knob to set the value, it will remain displayed in
the window~ Pull out the HDG/-rRK knob to activate the mode and turn the aircraft on to the
preset value~
Cancellation
The pilot can cancel a preset HDG/-FRK by :
~ engaging the NAV mode (DIR TO)
~ pushing in the HDG/-rRK knob (arming NAV mode)
~ disengaging AP/FD
NAVIGATION (NAV)
NAV mode is a managed mode that steers the aircraft laterally along the flight plan defined
in the FMGS. It is designed to have a zero cross-track error~ The pilot can arm or engage
the NAV mode if the MCDU contains a lateral flight plan~
ARMING CONDITIONS
Satisfying one of the following conditions arms NAV :
- The aircraft is on the ground with no HDG/-FRK preset and no other lateral mode except
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(33)