R | LAND ARM or LAND TRACK | CAT 1 | R -------------------------------------------------------------------
(h) Controls and warnings associated with automatic landing
1 ILS TUNE INHIBIT
_ When the LAND mode is armed with radio height below 700 feet or LAND TRACK mode or RUNWAY mode, the FMGC sends an ILS TUNE INHIBIT signal which allows the value and validity of the selected frequency to be frozen in the ILS/MMR receivers and the runway heading to be memorized in the FMGC.
2 Removal of FD bars
_
-the pitch FD bar is removed when the ROLL OUT mode is active and no longitudinal mode is active.
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3
_
4
_
-
the roll FD bar is removed when the ROLL OUT mode is active and no lateral mode is active.
-
the yaw FD bar is removed as long as the ROLL OUT or ALIGN mode is not active.
Availability of landing categories Whatever the flight phase, each FMGC computes the following three items of information according to the validity of sensors and the AP availability:
-
LAND 2 INOP
-
LAND 3 FAIL PASSIVE INOP
-
LAND 3 FAIL OPERATIONAL INOP. On the ECAM, loss of availability of the various landing categories is displayed according to a logic which primarily takes into account loss of validity of the lowest landing category provided by the two FMGCs.
Warnings
a_ Excessive deviations
This warning is activated if the position of the aircraft
with respect to the ILS beam exceeds:
- 75 microamperes for the GLIDE axis (above 100 ft. RA)
- 20 microamperes for the LOC axis (above 15 ft. RA).
This warning makes the LOC and GLIDE scales flash on the
PFD.
b AUTOLAND warning
_ This warning covers several warnings:
-excessive deviations
-loss of both APs.
The AUTOLAND warning is only activated below 200 ft.
(illumination of the AUTOLAND warning light on the CAPT
glareshield panel 131VU).
c Capability downgrading
_ A triple click aural warning is generated in the event of landing capability downgrading.
d FD bar flashing
_ The FMGC computes a command to make the longitudinal FD bar flash in the following conditions:
-with the G/S CPT, G/S TRACK, LAND TRACK and above 100 ft. RA when the ground transmission of the GLIDE is interrupted.
The FMGC computes a command to make the lateral FD bar flash in the following conditions:
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-with the LOC CPT, LOC TRACK, LAND TRACK and above 15 ft. RA when the ground transmission of the LOC is interrupted.
(2) FMS Approach (AREA NAV or R.NAV)
(a)
Characteristics This mode provides lateral and longitudinal guidance of the aircraft along a theoretical profile defined by the flight plan (Ref. 22-73-00). Guidance is ensured down to the MDA (Minimum Descent Altitude), altitude at which the pilot regains control of the aircraft. This mode is available on the AP and FD.
(b)
Operational use (Ref. Fig. 018) The AREA NAV approach is selected through the flight plan. In these conditions, the FINAL DES and NAV modes can be armed on the lateral and longitudinal axes by action on the APPR pushbutton switch on the FCU. If the NAV mode was already active, the mode will remain engaged.
(c)
Engage logic
1_ Arming of FINAL DES and NAV modes
(Ref. Fig. 019)
The arming logic of the FINAL DES mode is shown in figure.
The arming logic of the NAV mode is described in 22-12-00.
2_ Disarming of NAV and FINAL DES modes
This is commanded by:
- action on the APPR pushbutton switch
- action on the LOC pushbutton switch with the ILS signal
available (the LOC mode is armed)
- engagement of the GO AROUND mode.
3_ De-activation of active NAV and/or FINAL DES modes
The de-activation is commanded by:
- action on the APPR pushbutton switch which engages the
V/S-FPA mode if the FINAL DES mode is active and the
HDG/TRACK mode if the NAV mode is active.
- push action on the LOC pushbutton switch if the ILS is
available which arms the LOC mode and activates the
HDG/TRACK mode if the NAV mode is active and the V/S-FPA
mode if the FINAL DES mode is active.
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