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FCOM 19 AUG 10
HEADING OR TRACK: HDG - TRK
Applicable to:
,
,
MSN,,,,
These modes guide the aircraft laterally along a heading or track selected by the flight crew. The
HDG/TRK window of the FCU displays the target heading or track. The flight crew uses the HDG
V/S -TRK FPA pb to select heading or track.
ENGAGEMENT CONDITIONS
HDG or TRK is engaged when one of the following conditions is met:
The flight crew pulls out the HDG/TR ‐ K knob (not sooner than 5 s after lift-off)
‐ NAV is disengaged, either by the loss of the lateral flight plan or by the flight crew entering a
flight plan discontinuity
‐ FINAL mode (armed or engaged) is lost when the FMS profile validity is lost (e.g. overflying the
MAP)
‐ LOC or LOC* mode is lost
‐ The flight crew engages the AP/FD with no other mode already engaged (basic mode of AP/FD
engagement)
‐ The flight crew presses the LOC pb, when APP NAV or FINAL APP modes are already engaged
‐ The flight crew initiates a go-around below 100 ft and HDG or TRK is already engaged. When
the aircraft is at 100 ft or above, HDG or TRK are no longer 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 flight crew turns the HDG/TRK knob. The value in the window first synchronizes with the
current HDG/TRK, then displays the manual selection. It remains displayed for 10 s or 45 s
depending upon FCU standard, then vanishes if the flight crew does not pull the knob (except in
HDG preset)
‐ A HDG/TRK is preset (Refer to DSC-22_30-60 HDG/TRK Preset)
‐ AP/FD is lost. The value becomes that of the aircraft current heading or track.
Note: If HDG is switched to TRK (or vice versa), the value displayed in the window switches
from heading to track (or vice versa).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD LATERAL MODES
A318/A319/A320/A321 FLEET DSC-22_30-60 P 3/8
FCOM 19 AUG 10
HDG/TRK PRESET
Applicable to:
The system has a HDG/TRK preset function for takeoff and go-around.
If the flight crew chooses not to fly the flight plan after takeoff or go-around, they may preset a HDG
or a TRK on the FCU by turning the HDG/TRK knob. The value they set remains displayed in the
FCU HDG/TRK window until they pull the knob.
OPERATION AT TAKEOFF
HDG/TRK preset is available before takeoff and up to 30 ft RA. Turning the HDG/TRK knob before
30 ft sets the desired HDG/TRK. As a consequence:
‐ NAV is disarmed
‐ At 30 ft, RWY TRK is annunciated until the HDG/TRK knob is pulled.
OPERATION AT GO-AROUND
Whenever the LOC*, LOC, LAND, FINAL APP, or GA modes are engaged, the HDG preset is
available. If the flight crew rotates the HDG/TRK knob to set the value, it will remain displayed in
the window. Pull out the HDG/TRK knob to activate the mode and turn the aircraft to the preset
value.
CANCELLATION
The flight crew can cancel a preset HDG/TRK by:
‐ Engaging the NAV mode using the DIR TO
‐ Pushing in the HDG/TRK knob (arming NAV mode)
‐ Disengaging AP/FD.
HDG/TRK PRESET
Applicable to:
,
,
MSN,,,,
The system has a HDG/TRK preset function for takeoff and go-around.
If the flight crew chooses not to fly the flight plan after takeoff or go-around, they may preset a HDG
or a TRK on the FCU by turning the HDG/TRK knob. The value they set remains displayed in the
FCU HDG/TRK window until they pull the knob.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD LATERAL MODES
A318/A319/A320/A321 FLEET DSC-22_30-60 P 4/8
FCOM 19 AUG 10
OPERATION AT TAKEOFF
HDG/TRK preset is available before takeoff and up to 30 ft RA. Turning the HDG/TRK knob before
30 ft sets the desired HDG/TRK. As a consequence:
‐ NAV is disarmed
‐ At 30 ft, RWY TRK is annunciated until the HDG/TRK knob is pulled.
OPERATION AT GO-AROUND
Whenever the LOC*, LOC, LAND, FINAL APP, or GA modes are engaged, the HDG preset is
available. If the flight crew rotates the HDG/TRK knob to set the value, it will remain displayed in
the window. Pull out the HDG/TRK knob to activate the mode and turn the aircraft to the preset
value.
When overflying the MAP, HDG/TRK will synchronize with the current value. The HDG/TRK preset
function is no longer available.
CANCELLATION
　
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