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engagement)
‐ LOC mode is armed when FINAL APP was previously engaged
‐ LOC or LOC* being armed or engaged, the APPR pb is deactivated (above 400 ft).
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 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 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).
HDG/TRK PRESET
Applicable to: ALL
The system has a HDG/TRK preset function for takeoff and go-around.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD LATERAL MODES
A330/A340 FLEET DSC-22_30-60 P 2/6
FCOM 19 AUG 10
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 via 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. The flight crew must turn the
HDG/TRK knob before 30 ft to set the desired HDG/TRK. As a result:
‐ NAV is disarmed
‐ At 30 ft, RWY TRK is annunciated until the flight crew pulls the HDG/TRK knob.
OPERATION AT GO-AROUND
When the LOC*, LOC, LAND, FINAL, or GA modes are engaged, the HDG preset is available. If
the flight crew rotates the HDG/TRK knob to set the value, it remains 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 (DIR TO)
‐ Pushing in the HDG/TRK knob (arming NAV mode)
‐ Disengaging AP/FD.
NAVIGATION (NAV)
Applicable to: ALL
NAV mode is a managed mode that steers the aircraft laterally along the flight plan defined in the
FMGES. It is designed to have a zero cross-track error. The flight crew 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 ground with no HDG/TRK preset and no other lateral mode except runway
mode
‐ The flight crew pushes in the HDG/TRK knob, unless the LOC mode is engaged
‐ The flight crew presses the APPR pb, if a non-ILS approach is selected
‐ The flight crew selects a DIR TO/INTERCEPT when in HDG or TRK mode.
DISARMING CONDITIONS
NAV mode disarms if one of the following occurs:
‐ The flight crew pulls out the HDG/TRK knob
‐ The flight crew selects a preset HDG/TRK (TO or GA)
‐ The flight crew arms the LOC mode by pressing the LOC pb
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD LATERAL MODES
A330/A340 FLEET DSC-22_30-60 P 3/6
FCOM 19 AUG 10
‐ The flight crew selects GA mode
‐ LAND mode has engaged
The flight crew presses ‐ the APPR pb to deselect the non-ILS approach
‐ The flight crew deselects both AP/FDs.
ENGAGEMENT CONDITIONS
NAV mode engages:
‐ Automatically at 30 ft RA after takeoff (if armed on the ground)
‐ When the flight crew orders “DIR TO” (except below 700 ft RA in LOC mode)
‐ When the flight crew pushes in the HDG/TRK knob when the aircraft is close to (within▹1nm
of) the active flight plan leg
‐ Automatically in flight when NAV is armed and the aircraft reaches the capture zone for the
active flight plan leg.
CAUTION When NAV is armed, it will automatically engage if:
‐ The aircraft track line intercepts the flight plan before the TO waypoint, and
‐ The intercept waypoint (INTCPT) is displayed on the ND, and
‐ The aircraft reaches the active flight plan leg.
Note: The TO waypoint is displayed in white on NDs and MCDUs.
DISENGAGEMENT CONDITIONS
The NAV mode disengages when:
‐ Any other lateral mode is engaged
‐ The flight plan is lost or the aircraft enters a flight plan discontinuity
‐ At MDA-50 ft when APP NAV is engaged.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 2(40)
