-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
20-23-21-911-001 Removal/Installation of the Bobbins from their Housings and Installation of O-rings, Square Seals, and Back-up Rings on the Bobbins
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
External Power 29-00-00-910-002 Safety Procedures of the Hydraulic System 29-10-00-864-001 Depressurize the Green Hydraulic System 29-14-00-614-001 Depressurization of the Hydraulic Reservoirs 29-23-00-860-001 Disconnection of the Isolation Coupling of the Power
Transfer Unit (PTU) R 32-00-00-860-001 Flight Configuration Precautions with Electrical R Power
32-12-00-010-001 Open the Main Gear Doors for Access
32-42-11-991-001-A Fig. 401
3. Job Set-up
__________
Subtask 32-42-11-860-050
A. Aircraft Maintenance Configuration
(1)
Energize the aircraft electrical circuits
(Ref. TASK 24-41-00-861-002)
(2)
Depressurize the Green hydraulic system (Ref. TASK 29-10-00-864-001).
(3)
Make sure that the parking brake is OFF.
(4)
Make sure that the brake accumulator is depressurized.
Subtask 32-42-11-010-050
B. Get Access
(1) Open the left or the right MLG door (Ref. TASK 32-12-00-010-001).
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C. Disconnection of the PTU Isolation Coupling
(1)
Depressurize the reservoir of the Green hydraulic system (Ref. TASK 29-14-00-614-001).
(2)
Disconnect the PTU isolation coupling (Ref. TASK 29-23-00-860-001).
(3)
Obey the flight configuration precautions (Ref. TASK 32-00-00-860-001).
(4)
Put the access platform in position.
(5)
Put the container below the brake selector valve 23GG to collect the hydraulic fluid leakage.
Subtask 32-42-11-865-050
D. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY 4GG M36 121VU HYDRAULIC/BRAKING AND STEERING/SYS2/CTL 3GG M35 121VU HYDRAULIC/BRAKING AND STEERING/SYS1/CTL 1GG M34 121VU HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY 2GG M33 121VU HYDRAULIC/G HYD/PUMP ENG1/CTL 1701GK R35 121VU HYDRAULIC/G HYD/PUMP ENG1/MONG 1702GK R34
Subtask 32-42-11-941-050
E. Safety Precautions
(1) Put the warning notices in position to tell persons not to pressurize the Green hydraulic system: - on the panel 40VU in the cockpit, - on the ground service panel of the Green hydraulic system.
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4. Procedure
_________
(Ref. Fig. 401/TASK 32-42-11-991-001-A)
Subtask 32-42-11-020-051-A
A. Removal of the Brake Selector valve 23GG
(1)
Obey the hydraulic safety procedures (Ref. TASK 29-00-00-910-002).
(2)
Disconnect the electrical connector (10) from the brake selector valve (11).
(3)
Put blanking caps on the disconnected electrical connectors.
(4)
Remove the bolts (9), the washers (8) and the bonding strap (7).
(5)
Carefully remove the brake selector valve (11) from the manifold assembly (1).
(6)
Remove and discard the packings (2) and the back-up rings (3) from the bobbins (4).
(7)
Put blanking plugs on the disconnected line ends.
R (8) If necessary, remove the bobbins (4) (Ref. TASK 20-23-21-911-001), R discard the seals (6) and the back-up rings (5).
(9) Put blanking plugs on the disconnected line ends.
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R Brake Selector Valve 23GG Figure 401/TASK 32-42-11-991-001-A
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