Subtask 32-45-00-210-052
E. In zone 744, on the parking-brake electrical control-valve 72GG, make sure that the two circuit breakers are closed:
-
circuit breaker closed, you must see a black tape through the transparent cover (2)
-
circuit breaker open, you must see a white tape through the transparent cover (2). (Ref. Fig. 401/TASK 32-45-00-991-002)
NOTE : If you cannot see the circuit breakers through the transparent
____
covers (2) because they are in bad condition:
-remove the transparent covers (2) with their packings (1)
-make sure that the circuit breakers are closed
-install the transparent covers (2) with their packings (1).
-TORQUE the transparent covers (2) to between 0.05 and 0.08 m.daN
(4.42 and 7.07 lbf.in)
R **ON A/C ALL
4. Procedure
_________
Subtask 32-45-00-710-051
A. Operational test of the electric motors of the parking brake control valve
NOTE : The pressure value supplied to the brakes, when the parking brake
____ is applied, is 145 bar plus or minus 10 bar (2100 PSI plus or minus 145 PSI).
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Parking Brake Electrical Control Valve - Circuit Breakers
Figure 401/TASK 32-45-00-991-002
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ACTION RESULT -------------------------------------------------------------------------------
1.
Pressurize the Yellow hydraulic system with the electrical pump (Ref. TASK 29-24-00-863-001).
2.
Depressurize the Yellow hydraulic system (Ref. TASK 29-24-00-864-001).
3.
On the panel 121VU:
- open the circuit breaker 71GG.
NOTE : To make sure that the two
____ electric motors of the Parking-Brake Electrical Control-Valve operate correctly, you must do the test in two steps: -with 70GG closed and 71GG open -with 71GG closed and 70GG open
4. On the panel 110VU:
-put the PARKING BRK control switch 73GG in the ON position.
5. On the panel 110VU:
-put the PARKING BRK control switch 73GG in the OFF position.
Make sure that the pressure of theaccumulator increases on the tripleindicator until 206 bar (3000 PSI) (the indicator pointer is in the green range).
The triple indicator 60GG, shows theleft and right pressure values. In the brake units, make sure that the pistons supplied by the Yellow hydraulic system are in the operating or extended position. On the nose landing-gear leg, on the N/W Steering Deactivation Electric-Box 5GC, the PARKING BRAKE indicator light is on.
On the triple indicator 60GG, thepressure from the Yellow hydraulicsystem applied to the brakes is zero.
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6. On the panel 121VU:
-close the circuit breaker 71GG and open the circuit breaker 70GG.
7. On the panel 110VU:
-put the PARKING BRK control switch 73GG in the ON position.
8. On the panel 110VU:
-put the PARKING BRK control switch 73GG in the OFF position.
9. On the panel 121VU:
-close the circuit breaker 70GG.
In the brake units, the pistons supplied by the Yellow hydraulic system are in the released position. On the nose landing-gear leg, on the N/W Steering Deactivation Electric-Box 5GC, the PARKING BRK indicator light is off.
The triple indicator 60GG shows theleft and right pressure values. In the brake units, make sure that the pistons supplied by the Yellow hydraulic system are in the operating or extended position. On the nose landing-gear leg, on the N/W Steering Deactivation Electric-Box 5GC, the PARKING BRAKE indicator light is off.
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