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zone for the active flight plan leg, unless a HDG/TRK was preset.
Note: During a go-around, when the approach was previously flown in NAV, APP NAV or
FINAL APP modes, the NAV mode remains engaged, unless a HDG/TRK was preset.
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.
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
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD LATERAL MODES
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is disengaged, the vertical managed modes are not available and all downpath altitude and speed
constraints are ignored.
LOCALIZER MODE THROUGH THE LOC PUSHBUTTON
Applicable to: ALL
This mode captures and tracks a localizer beam independently of the glide path beam. Flight crew
use it to fly localizer-only approaches or to initiate an ILS approach when intercepting the glide slope
from above.
ARMING CONDITIONS
The flight crew arms the LOC mode by pressing the LOC pb, provided that:
An ILS is tuned ‐ (frequency and runway course)
‐ The aircraft is above 400 ft RA
‐ TO or GA mode is not engaged.
DISARMING CONDITIONS
LOC mode is disarmed by:
‐ Pressing the LOC pb when LOC is armed
‐ Arming the NAV mode
‐ Engaging the GA mode.
Note: Engaging NAV mode by selecting DIR TO does not disarm the LOC mode.
ENGAGEMENT CONDITIONS
The LOC mode engages automatically when capture conditions are met.
DISENGAGEMENT CONDITIONS
The LOC mode disengages:
‐ When another lateral mode is engaged
‐ When the flight crew presses the LOC pb again (engaging the HDG/TRK mode on the current
HDG/TRK).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - PRINCIPLES
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GENERAL
Applicable to: ALL
Vertical modes guide the aircraft in the vertical plan.
PRINCIPLES
Applicable to: ALL
To leave an FCU selected altitude for another target altitude, the flight crew must turn the Altitude
(ALT) knob in order to display the new target altitude and either:
‐ Pull out the ALT knob to engage the OPEN CLB/DES mode, or
‐ Push in the ALT knob to engage the CLB/DES mode, or
‐ Select a target vertical speed (V/S) and pull out the V/S or FPA knob to engage V/S mode, or
‐ Select EXPEDITE .
This arms ALT mode.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - PRINCIPLES
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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - CLIMB MODE
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GENERAL
Applicable to: ALL
CLB mode guides the aircraft in a managed climb, at either a managed or a selected target speed, to
an FCU selected altitude, taking into account altitude constraints at waypoints.
The system also considers speed constraints if the target speed is managed. The vertical flight path
may include several segments:
The flight crew can arm the CLB mode during the takeoff, go-around, climb, and cruise phases and
engage it during the climb and cruise phases.
ARMING CONDITIONS
Applicable to: ALL
The CLB mode is armed:
‐ On ground or when SRS mode is engaged (TO or GA) if the following conditions are met:
• No other vertical mode is engaged
• The ACCEL ALT (defined on the PERF TO or GA MCDU pages) is below the FCU selected
altitude and the lowest altitude constraint.
‐ In flight, when the climb or go-around phase is active, and the following conditions are met:
• The lateral NAV mode is engaged
• The FCU selected altitude is above the aircraft’s present altitude and the aircraft captures or
flies an altitude constraint.
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 2(87)
