LOC TRACK and ALIGN Control Law
Figure 014
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ROLL OUT Control Law
Figure 015
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INTENTIONALLY BLANK
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GLIDE Capture and Track Phase R Figure 016
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FLARE Control Law R Figure 017
1EFF : ALL 1 22-13-00Page 33/34 1 1 May 01/03 1 1 1CES In the case of approaches with head wind, and in order to take precautions against wind shear, a term is added to the VAPP ; this term allows the aircraft to have a ground speed during approach at least equal to the speed it will have at the runway threshold. This term, which takes into account the difference between the wind speed provided by the control tower displayed on the MCDU and the actual wind speed, will be added in automatic speed control as soon as the approach phase of the FM part is active. In these conditions, the speed bug is magenta and is controlled by this reference on the PFD speed scale.
(g) Landing capabilities Each FMGC computes its own automatic landing category according to the availability of the various sensors and functions. LAND 2 category:
-
at least 1 AP engaged with the LAND mode armed or LAND TRACK mode active
-
at least 1 FWC valid
-2 PFDs valid
R - 2 ILS/MMR receivers valid. LAND 3 FAIL PASSIVE category:
-LAND 2 conditions
-At least one A/THR function engaged
-
2 radio-altimeters valid. LAND 3 FAIL OPERATIONAL category:
-
2 APs engaged with the LAND mode armed or the LAND TRACK mode active
-at least one A/THR function engaged
-2 FWCs valid
-FMGCs must be supplied by two separate electrical power supply systems
-2 PFDs valid
-2 ELACs valid R - 2 ILS/MMR receivers valid
-2 radio-altimeters valid
-
3 IRS valid
-
3 ADCs valid
-BSCU valid
-2 FACs valid
-No IRS or ADC failures detected by FAC 1 or 2
-
2 yaw dampers engaged
-
2 rudder trims engaged.
Each FMGC computes the landing capability of the system made up
of the two FMGCs:
-when the AP and FD are disengaged for one FMGC, the landing capability corresponds to the category of the only FMGC likely to provide automatic landing.
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-when the AP or FD is engaged for the two FMGCs, the landing capability corresponds to the lowest category coming from the 2 FMGCs.
The landing capability is sent to the EFIS for display on the FMAs. The LAND 3 FAIL OPERATIONAL capability is obtained when the two FMGCs have the LAND 3 FAIL OPERATIONAL category. In this configuration, the objective is to continue automatic landing in spite of the simple failures which might affect the various systems used during this phase.
NOTE : Below 100 ft. (radio altimeter), LAND 3 FAIL PASSIVE and
____ LAND 3 FAIL OPERATIONAL categories are memorized until the LAND TRACK mode is disengaged or the 2 APs are disengaged. A failure occuring below 100 ft. will thus not cause any capability downgrading.
The CAT1, CAT2, CAT3 SINGLE and CAT3 DUAL messages are displayed on the FMA according to the landing capabilities sent by the FMGCs.
-------------------------------------------------------------------| CAPABILITY | FMA |
-------------------------------------------------------------------R | LAND 3 FAIL OPERATIONAL (FO) | CAT 3 DUAL |
|------------------------------------|----------------------------|
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