(b)
Operational use
The ILS approach can be selected: R - implicitly, through the flight plan definition. In this case, R the frequency of the ILS/MMR receivers is adjusted R automatically on the value read in FM memory.
-expressly, by selecting a frequency and a runway heading by
means of the MCDU or the RMP. In these conditions, the LAND mode can be armed by action on the APPR pushbutton switch on the FCU. The arming of this mode enables the LOC and GLIDE modes to be armed on the lateral and longitudinal axes. The support modes, active on these axes, remain engaged until the LOC and GLIDE beams are captured. Switching to the G/S CPT and LOC CPT modes occurs when the capture conditions are met. When the aircraft is stabilized on the LOC and GLIDE beams:
-
the LOC TRACK and GLIDE TRACK modes are activated
-
the AP/FD guides the aircraft along the ILS beam to 30 ft. At this altitude, the LAND mode provides the alignment on the runway centerline on the yaw axis and flare on the pitch axis. When the A/THR is engaged, the thrust reduction (RETARD) is activated.
1EFF : ALL 1 22-13-00Page 15 1 1 Nov 01/98 1 1 1CES 1 The ROLL OUT sub-mode is engaged at touchdown and provides guidance on the runway centerline. As the LAND mode is latched below 400 ft. (switching to LAND TRACK), it can be de-activated only by engaging the GO AROUND mode. Actions on the FCU are no longer taken into account.
NOTE : The GLIDE mode can only be captured after LOC mode
____ capture. However the GLIDE capture can be independent from the LOC capture (option activated by pin programming).
(c) Engage logic
1_ LAND mode arming
(Ref. Fig. 008)
The arming of the LAND mode enables arming of the LOC and
GLIDE modes.
2 LAND mode disarming
_ The LAND mode is disarmed in the following conditions:
a Arming phase (LOC and GLIDE modes armed)
_ The LAND mode is disarmed by:
-action on the APPR pushbutton switch
-arming another mode : NAV (push action on the heading/track selector knob) or LOC (action on the LOC pushbutton switch) on the lateral axis
-engagement of the GO AROUND mode.
The support modes previously engaged remain active. The LOC
and GLIDE modes are disarmed except when the LOC mode is
armed by means of the LOC pushbutton switch.
b Active phase (LOC and GLIDE modes active)
_ The LAND mode is disarmed by:
-
action on the APPR pushbutton switch which engages the V/S mode if the GLIDE mode was active, and the HDG/TRACK mode if the LOC mode was active.
-
action on the LOC pushbutton switch which engages the V/S-FPA mode if the GLIDE mode was active or causes loss of GLIDE mode arming if this mode was armed.
-
pull action on the V/S-FPA selector knob when the GLIDE mode is active. Engagement of the V/S or FPA mode engages the HDG/TRACK mode on the lateral mode on the lateral axis.
-
pull action on the heading/track selector knob which engages the HDG/TRACK mode. Engagement of this mode engages the V/S-FPA mode if the GLIDE mode was active.
-engagement of the GO AROUND, EXP, OPEN and NAV modes.
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ILS Approach
Figure 007
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1
LAND Mode Arm - Logic
Figure 008
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1 1 Feb 01/98
1 1
1CES 1
NOTE : The disengagement of the LAND mode below 400 ft.____
will be possible by action on the APPR pushbutton
switch provided the aircraft has been on the ground
for 10 s and the AP is disengaged.
3_ GLIDE and LOC capture
(Ref. Fig. 009)
Switching to G/S CPT and LOC CPT modes occurs when the capture
conditions are met and provided the LOC and GLIDE modes have
been armed. Switching to G/S TRACK and LOC TRACK modes occurs
when associated conditions are met. All the switching
conditions are given in figure.
The term delta psi is the deviation between the aircraft track
(IR) and the runway heading (ILS).
4_ LAND TRACK capture
(Ref. Fig. 010)
The mode engage logic is shown in figure.
The LAND TRACK mode includes two sub-modes:
- ALIGN which engages at 50 ft. provided the FACs are armed
(below 100 ft. loss of the FACs does not cause AP/FD
disengagement or loss of LAND TRACK mode).
- ROLL OUT which is activated (only below 50 ft.) using:
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