B. Braking during towing operation
(Ref. Fig. 019)
A function in the ABCU allows to brake the aircraft during towing operation. The ABCU is able to switch from DC Essential Power Supply to the Hot bus Power Supply when no electrical power supply is available and the pedals are depressed.The ABCU is connected to a third set of potentiometers in the alternate BPTU and a connection to the Hot bus Power Supply is done.Park Brake can be applied, as well without electricity on board (batteries only).
C. Indicating
(1) Wheel Page
(Ref. Fig. 020)
If the Normal Braking system is not available, the BSCU will
automatically select the Alternate Braking with Anti Skid system.
When the Normal Braking system is not available:
-
the WHEEL page shows the caption NORM BRK in amber and the caption ALTN BRK in green
-
the AUTO BRK pushbutton light extinguishes.
The ALTN BRK message is displayed green in case of:
-
the alternate braking mode is available (loss of the normal braking), the green or yellow pressure are not low and both BSCU channels are faulty or the anti-skid switch is set to off,
- or, the NORM BRK message is displayed,
- or, the AUTO BRK message is displayed.
The ALTN BRK is displayed amber in case of the ALTN BRK left or right
RELEASED fault or both yellow circuit pressure and the yellow
accumulator pressure are low.
If none of these conditions are met, nothing is displayed on the
WHEEL PAGE.
(2) Alternate Braking System Warnings
Each condition shown below causes:
-the master caution light to come on
-a single aural chime to operate
-
the WHEEL page to show on SYSTEM DISPLAY
-
the EWD to show the related message
1EFF : 401-499, 1 32-43-00Page 35 1 1 Config-2 Aug 01/05 1 1 1CES 1
Braking during Towing operation - Logic
Figure 019
1EFF : 401-499, 1 32-43-00Page 36 1 1 Config-2 Aug 01/05 1 1 1CES 1
Wheel Page
Figure 020
1EFF : 401-499, 1 32-43-00 Page 37
1 1 Config-2 Aug 01/05
1 1
1CES 1
(a)
BRAKES NORM+ALTN FAULT
-Normal braking and Alternate braking mode failure
-SC, MAST CAUT, message on EWD and SD
The conditions, which trigger this warning, are:
-A normal braking fault,
- or, a green low pressure,
- or, an anti-skid fault or A/SID & N/W STRG switch selected OFF,
and
-an alternate braking fault, - or, an anti-skid fault or A/SKID & N/W STRG switch selected OFF,
- or, a yellow low pressure
and
-a yellow accumulator low pressure.
(b)
BRAKES ALTN BRK FAULT
In case of ALTN L and ALTN R RELEASED fault
(c)
BRAKES ALTN L(R) RELEASED
This message warns the crew that the braking will be asymmetric in case of normal braking failure.
1EFF : 401-499, 1 32-43-00Page 38 1 1 Config-2 Aug 01/05 1 1 1CES 1 ALTERNATE BRAKING WITH ANTI SKID - SERVICING
____________________________________________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
TASK 32-43-00-612-001
Filling and bleeding of the Low Pressure Control System of the Alternate Braking WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______
GEAR.
WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE
_______
CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
WARNING : MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY
_______
OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM.
WARNING : PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR
_______ THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.
WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE
_______
YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT.
1. Reason for the Job
__________________
You must do this procedure to fill the system or after you remove equipment from it.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
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