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AREA NAV Approach
Figure 018
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FINAL DES Mode - Logic
Figure 019
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with the FINAL DES mode active as a result of V/S-FPA, OP CLB, OP DES or EXP mode engagement, engagement of this mode engages the HDG/TRACK mode on the lateral axis if the NAV mode is active.
-
with the NAV mode active as a result of HDG/TRACK mode engagement, engagement of this mode engages the V/S-FPA mode if the FINAL DES mode is active.
-engagement of the GO AROUND mode. When the aircraft goes down to the minimum descent altitude (MDA), the pilot can continue the AREA NAV approach if the visibility conditions are correct. If not, the pilot must interrupt the approach phase. This phase does not ensure landing.
(d) Displays Selection of the AREA NAV approach is indicated by:
-illumination of the APPR pushbutton switch on the FCU
-display of various indications on the FMA section of the PFD, as follows: . in the arming phase: cyan FINAL indication in the lower part of the PFD section corresponding to the longitudinal modes, cyan APP NAV indication in the lower part of the PFD section corresponding to the lateral modes. . in the active phase: green FINAL indication on the 1st line of the section corresponding to the longitudinal modes, green APP NAV indication on the 1st line of the section corresponding to the lateral modes.
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(1)
Principle (Ref. Fig. 020) On the lateral axis, this mode enables to hold the path followed by the aircraft when the mode was engaged. On the longitudinal axis, it ensures managed speed control. The speed reference of the guidance law is the aircraft speed when the mode was engaged (the lower limit of this speed is the approach speed). This mode is available on the AP and the FD. It is engaged when the pilot selects the maximum thrust by positioning the throttle control levers in the TO/GA gate. Engagement is indicated by the green SRS and GA TRK indications displayed in the FMA sections corresponding to the longitudinal and lateral modes.
(2)
Engage Logic
(Ref. Fig. 021)
Engagement of the GO AROUND mode results in:
-
engagement of the PITCH GO AROUND mode on the pitch axis
-
engagement of the ROLL GO AROUND mode on the roll axis.
The PITCH GO AROUND mode can only be disengaged by engaging another
longitudinal mode.
The ROLL GO AROUND mode can only be disengaged by engaging another
lateral mode.
When in PITCH GO AROUND mode, engagement of a cruise mode is possible
only above 100 ft RA.
In dual-AP configuration, disengagement of the GO AROUND mode on one
axis causes disconnection of the AP2.
(3)
Command Generation
(a)
Pitch axis Engagement of the PITCH GO AROUND mode calls the SRS guidance law described in Para. 2.A.(2)(c). The speed reference is the aircraft speed memorized when the GA mode was engaged. However this reference speed cannot be lower than the approach speed memorized at 700 ft. during approach.
(b)
Roll axis Engagement of the ROLL GO AROUND mode calls the TRACK guidance law (Ref. Para. 2.A.(3)(c)). The path reference of the guidance law is the path followed by the aircraft when the ROLL GO AROUND mode is engaged.
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(4) Heading/Track Preset The heading/track preset function is available in LOC CPT, LOC TRACK, LAND TRACK and ROLL GO AROUND modes if the pilot selects a heading/track value on the FCU. In ROLL GO AROUND mode, the NAV mode can be armed only by push action on the heading/track selector knob on the FCU. The preset function can be cancelled as described in Para. 2.A.(3)(d).
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GO AROUND Mode
Figure 020
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GO AROUND Logic (Pitch and Roll Axes)
Figure 021
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D. Display of Common Modes
(1) Flight Mode Annunciator (FMA)
(a)
General rules The common modes are always displayed in plain language. The first line indicates the active mode in green. The second line indicates the armed mode in cyan. In automatic landing configuration, when LAND TRACK is engaged, the message is displayed in the section common to the lateral and longitudinal modes.
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