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 (4)
 Make sure that the connectors of the hydraulic pipes (2), (3) and (4)

 are clean and in the correct condition.

 (5)
 Connect the hydraulic pipes (2), (3) and (4) to the parking-brake electrical control-valve (7).

 (6)
 Remove the blanking caps from the electrical connectors.

 (7)
 Make sure that the electrical connectors are clean and in the correct condition.

 (8)
 Connect the electrical connectors (6) to the parking-brake electrical control-valve (7).

 Subtask 32-45-53-860-052
 C. Preparation for Test
 (1)
 Connect the PTU isolation coupling (Ref. TASK 29-23-00-860-002).

 (2)
 Bleed the alternate brake system (Ref. TASK 32-43-00-870-002).

 (3)
 If necessary, fill the reservoir of the Yellow hydraulic system to the correct level (Ref. TASK 12-12-29-611-001).

 Subtask 32-45-53-865-052
 D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1GG, 2GG, 3GG, 4GG, 61GG, 70GG, 71GG, 3700GD, 3701GD, 3801GX, 3802GX, 3803GX.
 Subtask 32-45-53-710-050
 E. Test
 (1)
 Do an operational test of the parking brake system (Ref. TASK 32-45-00-710-001).

 (2)
 Make sure that there is no hydraulic fluid leakage from the parking-brake electrical control-valve (7).

 NOTE : Leaks are not permitted.
____
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 5. Close-up
________ Subtask 32-45-53-410-050
 A. Close Access
 (1) Apply the corrosion protection to the parking-brake electrical control-valve (7).
 WARNING : OBEY THE MANUFACTURER'S INSTRUCTIONS WHEN YOU USE
_______ THIS/THESE MATERIAL/S. USE PROTECTIVE CLOTHING, RUBBER GLOVES AND A MASK.
 (a) Apply transparent protective coating, PAINTS FOR DETAIL (INTERNAL AND EXTERN AL) (Material No. 07-023) to the bolt heads, pipe connections and the adjacent areas.
 (2)
 Remove the container.

 (3)
 Remove the warning notice(s).

 (4)
 Remove the access platform(s).

 (5)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (6)
 Close the right MLG door (Ref. TASK 32-12-00-410-001).

 (7)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

 1EFF : 401-499, 1 32-45-53Page 412 1 1 Aug 01/05 1 1 1CES 1 BRAKES AND STEERING - BITE - DESCRIPTION AND OPERATION

______________________________________________________
 1. BITE and Maintenance Test
_________________________ (Ref. Fig. 001) Depending on the different phases of flight, the BSCU automatically triggers the tests below:
 -Power-up test,
 -Auto test: flight with the landing gear retracted during the power supply rise,
 -Functional test: in flight with the landing gear extended until touchdown of the main gear,
 -Tachometer test: rolling without brake application,
 -
Permanent monitoring: during operation of the braking or steering system.

 A.
 Power-up Test

 (1)
 Cold reset At every energization, the BSCU performs the tests below:

 -reading of the aircraft pin programming. A comparison is made between the values acquired by the COM and MON channels and a reference value stored in memory on the computing board. If the comparison is not effective, it is possible to adapt the aircraft pin programming to the BSCU via the CFDIU.
 -
test on CPU boards and associated circuitry,

 -
test on RAMs,

 -consistency and checksum tests on OBRM.

 (2)
 Hot reset The hot reset is activated when one engine at least is running and when one tachometer speed is at least higher than 1 m/s (aircraft moving). The hot reset initialization time is faster than the cold reset one by limiting the number of tests (during this reset).

 B.
 Operation of the Functional Test The functional test starts as soon as the gears are locked down. Its purpose is to do the test of the hydraulic equipment under pressure and the electronic control components of the systems 1 and 2. It also permits to monitor the availability of the automatic braking and of the nosewheel steering systems until the touchdown. This is to meet the safety requirements of a CAT III B landing. To this effect the BSCU sends 4 availability discretes to the 2 FMGCs. A checksum test of the computing board OBRM is performed during all the functional tests on the active and passive systems. An alternate-current monitoring test is activated during the functional test. The functional test has two parts, running on the active system:
　
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