Lateral Modes Active in Cruise
Figure 002
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HDG/TRK Selection
Figure 003
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HDG/TRK Mode
Figure 004
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1 The acquisition of the heading (track) displayed during the initial engagement is made in the shortest way. On the contrary, with the HDG/TRK mode engaged, if a change of selected heading (track) is made on the FCU, the acquisition of the new heading (track) will be made following the direction of rotation of the heading/track selector knob of the FCU for the display.
(b)
Elaboration of orders (Ref. Fig. 005) This figure gives the principle of elaboration of the AP/FD orders in HDG/TRK mode.
(c)
Operational logic The HDG/TRACK modes are activated if one of the conditions below is met:
-pull action on the HDG TRK selector knob on the ground with engines shut down and in flight 5 s after lift-off
-loss of lateral flight plan, with the NAV mode active and on condition that the FINAL DES mode is not armed or active
-engagement of AP or FD in flight, with no AP/FD engaged
-
loss of LOC capture or LOC track due to the loss of the LAND mode, independent of the selection of a lateral mode and of action on the LOC pushbutton switch
-
loss of the NAV mode due to the loss of FINAL DES mode active or armed and independent of the selection of a lateral mode (action on the APPR pushbutton switch or selection of the V/S FPA mode)
-
loss of the LOC capture or LOC Track mode not in the LAND mode through action on the LOC pushbutton switch
-arming of LOC mode, the NAV mode associated to the FINAL DES mode being active.
(2) Navigation Mode (NAV)
(a) Characteristics This mode enables the aircraft to be controlled in the horizontal plane using the commands calculated by the Flight Management (FM) section. The mode includes an arming phase, the support mode can be the HDG/TRK or RUNWAY mode and an active phase. The NAV mode can only be active or armed if a lateral flight plan, calculated by the FM from data introduced on the MCDU, is available. The possibilities of navigation in the horizontal plane are described in 22-72-00 Navigation/Lateral Functions.
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HDG/TRK Control Law
Figure 005
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(b)
Operational use (Ref. Fig. 006) On the ground, the NAV mode is automatically armed as soon as a flight plan is available. At takeoff, the switching to active NAV occurs at 30 ft. In the same conditions and if the radio altimeters are failed, the NAV mode becomes active 5 s after lift-off. In flight, the NAV mode is armed through push action on the HDG TRK selector knob except if the LOC mode is active. The NAV mode becomes active when the capture of the flight plan can be started. (Ref. Fig. 007) The capture condition is calculated by the FM part. The NAV mode can become active without passing through the arming phase when the pilot modifies his flight plan through the DIRECT TO procedure on the MCDU. (Ref. Fig. 008) The arming of the NAV mode is indicated to the pilot through the illumination of the LAT indicator light on the FCU. When the NAV mode becomes active, the light remains on and dashes are displayed in the HDG TRK window of the FCU display.
(c)
Guidance With the NAV mode active, the FM selects the lateral guidance mode and associated target. The guidance modes available are:
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