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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.
NAVIGATION (NAV)
Applicable to:
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 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.
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)
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 5/8
FCOM 19 AUG 10
‐ The flight crew arms the LOC mode by pressing the LOC pb
‐ The flight crew selects GA mode
‐ LAND mode has engaged
‐ The flight crew presses the APPR pb, if an XLS approach is selected.
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 ∼1 nm
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.
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 6/8
FCOM 19 AUG 10
INTERACTIONS WITH VERTICAL MODES
When NAV mode is engaged, the vertical managed modes CLB or DES or FINAL take into
account altitude and speed constraints linked to waypoints on the lateral flight plan. If NAV mode
is disengaged, the vertical managed modes are not available and all downpath altitude and speed
constraints are ignored.
NAVIGATION (NAV)
Applicable to:
,
,
MSN,,,,
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 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
‐ A go-around is initiated, unless HDG/TRK is already preset.
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
‐ LAND mode has engaged
‐ The flight crew presses the APPR pb, if an XLS approach is selected.
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 ∼1 nm
of) the active flight plan leg
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 7/8
FCOM 19 AUG 10
‐ Automatically in flight when NAV is armed and the aircraft reaches the capture zone for the
active flight plan leg.
‐ Automatically during a go-around, when the aircraft is above 100 ft RA, and within the capture
　
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