-an attitude protection to reduce the A/C nose-up attitude during this phase
-a vertical speed protection to ensure a minimum climbing rate
-an attitude pre-command to initialize the aircraft rotation when the mode is engaged (this pre-command is active in PITCH GA mode only which calls the same control law, Ref. Para.3.C.).
(3) Lateral Axis
(a)
Operational use (Ref. Fig. 001) The guidance law on the lateral axis provides guidance of the aircraft on the runway centerline by means of the LOC beam. The pilot makes this possible by selecting the ILS frequency associated with the takeoff runway. This selection can be made :
-implicitly by selecting the takeoff runway or departure procedure on the MCDU
-expressly, by selecting the frequency on the RMP or the MCDU. The lateral TO (RUNWAY) mode can be engaged when the aircraft is at the end of the runway and receives the LOC deviation signals. If the ILS is not available or if the ILS frequency is not selected, the TO mode is not engaged on this axis.
(b)
Engage logic
(Ref. Fig. 004)
This logic takes into account certain protections:
-possible modification of the takeoff runway ILS (through the RMP) when an implicit selection has been made through a takeoff procedure
-engagement of the mode when not yet aligned
-takeoff on a parallel runway.
The RUNWAY mode includes two sub-modes:
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SRS Control Law
Figure 003
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RUNWAY Mode Logic
Figure 004
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-
RUNWAY LOC to 30 ft.; the FD law provides guidance of the aircraft on the runway centerline
-
RUNWAY TRACK from 30 ft. when the NAV mode is not armed (Ref. Para. 2.A.(3)(d)). The guidance law provides hold of the aircraft track memorized at engagement of the sub-mode.
The RUNWAY mode can be disengaged:
-by engaging another lateral mode
-when the LOC signal is lost before 30 ft.
-if a difference between COM and MON channels greater than 12 deg. is detected on yaw FD bars.
(c)
Guidance law (Ref. Fig. 005) The RUNWAY guidance law called when the RUNWAY LOC sub-mode is engaged is shown in figure. The TRACK guidance law called when the RUNWAY TRACK sub-mode is engaged is described in 22-12-00.
(d)
Heading/track preset at takeoff (Ref. Fig. 006) During takeoff, when the aircraft is on the ground or at an altitude less than 30 ft., the pilot can select a heading/track preset value in the HDG/TRK display on the FCU (by action on the heading/track selector knob) provided that one of the following modes is engaged : LOC CPT, LOC TRACK, LAND TRACK, FINAL DES, GO AROUND. The NAV mode is disarmed when the preset is activated and the FCU HDG TRK window is synchronized with the aircraft heading or track. As a result, the RUNWAY mode remains engaged at 30 ft. in the RUNWAY TRACK sub-mode. The heading preset value is cancelled by:
-acceptance of the preset value when the HDG or TRACK mode is engaged (pull action on the heading/track selector knob)
-engagement of the NAV mode (direct TO)
-push action on the heading/track selector knob
-AP/FD disengagement.
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RUNWAY Control Law
Figure 005
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INTENTIONALLY BLANK
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Takeoff with Heading Preset
Figure 006
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B. APPROACH Mode The automatic flight control system installed enables two types of approach to be considered :
-ILS approach (LAND mode) : guidance is performed on the ILS beam (LOC and GLIDE)
-FMS approach : guidance is performed from a theoretical path computed
by the FMS. The type of approach is selected by means of the MCDU. The selection of an ILS frequency on the RMP forces the selection of the ILS approach whatever the selection made on the MCDU. The APPROACH mode (ILS or FMS) is engaged when you push the APPR pushbutton switch on the FCU.
(1) ILS Approach
(a)
Characteristics This mode provides the capture and track of the ILS beam (LOC and GLIDE) and ensures the following functions : alignment, flare and roll out. This mode is available for the AP and FD. It enables landings to be performed in Cat. III operation. Therefore, the selection of the LAND mode authorizes the engagement of a second AP. (Ref. Fig. 007)
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