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‐ An ILS approach or a runway only or no approach is inserted in the Flight Management flight
plan (ARRIVAL page), and an ILS frequency is set in on the MCDU, or
‐ Both radio management panels are set to NAV and each one has the ILS frequency and
course set in.
CHECK APPROACH GUIDANCE MESSAGE
If the flight crew inserts a non-ILS approach into the flight plan, and then uses the RAD NAV
page to tune an ILS manually, the MCDU displays “CHECK APPR GUIDANCE”. This message
is a reminder that the available APPR guidance modes are APP NAV and FINAL.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - APPROACH
A318/A319/A320/A321 FLEET DSC-22_30-80-30-10 P 2/10
FCOM 19 AUG 10
Example: OLW was manually entered on the RAD NAV page although a VOR approach is
selected in the flight plan.
Applicable to:
APPR MODE
ARMING CONDITIONS OF LOC AND G/S MODES
The flight crew arms the ILS APPR mode (LOC and G/S in blue on the FMA) by pushing the
APPR pb on the FCU, provided that:
‐ An ILS approach is selected
‐ The aircraft is above 400 ft RA
‐ The ILS and RA are available
‐ Go-around or takeoff or final mode is not engaged
‐ ILS frequency and course are identically set on both receivers.
LOC and G/S blue are displayed on the FMA. Both modes will automatically engage when
conditions are met.
Second autopilot may be engaged.
Current landing capability is displayed on the FMA.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - APPROACH
A318/A319/A320/A321 FLEET DSC-22_30-80-30-10 P 3/10
FCOM 19 AUG 10
DISARMING CONDITIONS OF LOC AND G/S MODES
ILS APPR mode is disarmed, if the aircraft is above 400 ft and:
When the flight crew presses the APPR pb, both ‐ the LOC and the G/S modes disarm.
The HDG/TRK mode engages if the LOC mode was engaged, and the V/S (FPA) mode
engages if the G/S mode was engaged
‐ When the flight crew presses the LOC pb, only the G/S mode disarms.
The V/S (FPA) mode engages, if the G/S mode was engaged
‐ When the flight crew pulls the HDG/TRK knob
‐ When the flight crew engages the go-around mode.
ENGAGEMENT CONDITIONS OF LOC AND G/S MODES
When ILS capture conditions are fulfilled:
‐ LOC* mode engages, and
‐ G/S* mode engages. No radio altimeter validity is required with this FMGC standard for G/S
engagement. The FMA displays “LOC*”, or “G/S*”, or both, in green.
Nevertheless, the G/S* mode cannot engage, if:
‐ LOC* mode is not engaged, or
‐ The aircraft is above the glide path and its trajectory does not cross the ILS G/S beam.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - APPROACH
A318/A319/A320/A321 FLEET DSC-22_30-80-30-10 P 4/10
FCOM 19 AUG 10
When the aircraft is established on the LOC axis, the LOC mode engages.
When the aircraft is established on the G/S axis, the G/S mode engages.
The FMA displays “LOC” and “G/S” in green. The AP/FD guides the aircraft along the G/S down
to 30 ft, and along the LOC during the flare and rollout.
Note: G/S* or G/S modes may be engaged above the operating range of the radio altimeters
(8 000 ft for TRT, and 5 000 ft for Collins and Honeywell radio altimeters). The landing
capability displayed on the FMA will reflect the lack of RA validity (CAT 1) until the
radio altimeters become active.
But, if the radio altimeters fail, or if the FMGS receives no radio altimeter data, LOC,
G/S, and AP/FDs will disengage and FDs will re-engage on basic modes.
DISENGAGEMENT CONDITIONS OF LOC AND G/S MODES
If the aircraft is above 400 ft, the ILS APPR mode disengages when the flight crew:
‐ Presses the APPR pb, HDG V/S or TRK FPA engages
Presses the LOC pb, the LOC mode remains engaged. ‐ The system reverts to V/S (FPA), if
G/S was engaged
‐ Pulls out the V/S or FPA knob, the system reverts to basic modes (HDG V/S or TRK FPA
engages)
‐ Pulls out the HDG/TRK knob, HDG V/S or TRK FPA engages
‐ Engages the go-around mode.
LOC CAPTURE ASSISTANCE FUNCTION
In NAV mode, and when within 20 nm of the destination runway, the aircraft is guided with a
track angle of 20 ° from the LOC axis. This helps the aircraft intercept and capture the LOC
beam.
When the ILS frequency or the ILS ident entered on the RAD NAV page differs from the ILS of
the destination runway entered in the flight plan:
‐ The aircraft loses the LOC capture assistance function
　
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