(b)
Rudder pedals The load is applied on the rudder artificial feel (addition of a spring in the artificial feel and trim unit). The load threshold changes from 10 to 30 daN when the AP is engaged.
NOTE : Exceeded load results in AP disconnection.
____
(6) Warnings
(a) AP OFF warning (Ref. Fig. 017) The FWCs generate various warnings upon AP disengagement. Their display and the clearing actions depend on the origin of the disengagement.
1 Manual disengagement through takeover and priority pushbutton
_ switches Upon disengagement through these pushbutton switches, the FWCs generate the following warnings:
-
The red MASTER WARN lights on the glareshield flash for 3 s
-
The red AP OFF message is displayed for 9 s on the upper display unit of the ECAM system in the MEMO section
-
The cavalry charge aural warning sounds for 1.5 s. All these warnings are cleared automatically. Action on one takeover and priority pushbutton switch or on the one MASTER WARN light enables to cancel these warnings. The crew can also clear the AP OFF message on the display unit of the ECAM system (minimum duration of the aural warning is 0.5 s).
2 Disengagement resulting from a failure or from the pilot
_ pushing the FCU AP pushbutton, or from a force on the sidestick or rudder pedals The FWCs generate the following warnings:
-
The red MASTER WARN lights flash
-
The red AUTO FLT AP OFF message is displayed on the upper display unit of the ECAM system
-
The cavalry charge aural warning sounds
-
The CLR pushbutton switch on the ECAM control panel comes
on. These warnings are not cancelled automatically:
-
Action on one takeover and priority pushbutton switch or on one MASTER WARN light cancels this warning and the cavalry charge warning stops after 1.5 s
-
Action on the CLR pushbutton switch cancels all the AP warnings (MASTER WARN light, message on the upper display unit of the ECAM system and aural warning). This action enables the display of the STATUS page (AP1 or AP2 or AP1 + 2) on the lower display unit of the ECAM system.
AP Command Generation
Figure 015
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1
Side Stick Controllers and Rudder Pedals - Locking Logic
Figure 016
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1
AP OFF Warning
Figure 017
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1 NOTE : At AP disengagement, and in addition to these warnings
____ the corresponding engagement pushbutton switch on the FCU goes off. The AP1 or AP2 or the AP1 + 2 message disappears in the engagement status column of the FMA on the PFD(s).
(b) AP availability The FMGC generates an AP INOP message to the FWCs giving the availability of the associated AP. When this item of information is present, the AP1 or/and AP2 message is displayed in the INOP SYS column of the lower display unit of the ECAM system. Each FMGC takes into account the following items of information for the availability of the AP:
-Its own validity and the validity of the FM part
-ADR validity
-IR validity
-FCU validity
-Rudder trim availability
-Yaw damper availability
-FAC and characteristic speed validity
-LGCIU validity
-ELAC availability.
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CRUISE MODES - DESCRIPTION AND OPERATION
________________________________________
1. General
_______
R A. Engagement Principle The engagement of the cruise modes on the AP/FD obeys the operational utilization principle of the AFS. When the pilot wants to manually control a flight parameter, he must select the required value on the FCU then pull the associated selector knob. Then, the AP/FD mode of the manual control of this parameter is engaged. In order to have a flight parameter controlled by the flight management part of the FMGC, the pilot must push the associated selector knob. The automatic control is then armed or activated.
B. Engagement on the Ground In order to facilitate the AFS test, certain cruise modes can be activated on the AP and on the FD, on the ground when the engines are stopped. All these modes are disengaged at engine start-up on the ground and this causes the return to a configuration in conformity with the takeoff phase.
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C. Synchronization of Modes Between FMGCs So as to ensure a consistent operation of the AFS, it is mandatory to have the two FMGCs in operation with the same modes active and armed. The logic for the selection of the FMGC which has priority takes into account the engagement of the AP, FD and A/THR functions. This logic is indicated below.
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