(2)
 Make sure that the PTU isolation coupling is disconnected (Ref. TASK 29-23-00-860-001).

 (3)
 Make sure that the flight configuration precautions are obeyed (Ref. TASK 32-00-00-860-001).

 (4)
 Make sure that the Green hydraulic system is depressurized (Ref. TASK 29-10-00-864-001).

 (5)
 Make sure that the reservoir of the Green hydraulic system is depressurized (Ref. TASK 29-14-00-614-001).

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 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------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 32-42-11-941-051
 C. Make sure that the warning notices are 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.
 Subtask 32-42-11-560-050-A
 D. Preparation for Installation
 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (4)
 Obey the hydraulic safety procedures (Ref. TASK 29-00-00-910-002).

 (5)
 Apply HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) to the new packings (2) and the new back-up rings (3).

 (6)
 If removed apply HYDRAULIC FLUIDS (Material No. 02-003), HYDRAULIC FLUIDS (Material No. 02-003A), HYDRAULIC FLUIDS (Material No. 02-003B), HYDRAULIC FLUIDS (Material No. 02-003C) or HYDRAULIC FLUIDS (Material No. 02-003D) to the new seals (6) and the new back-up rings (5).

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 4. Procedure
_________
 (Ref. Fig. 401/TASK 32-42-11-991-001-A)
 Subtask 32-42-11-420-051-A
 A. Installation of the Brake Selector Valve 23GG
 (1) Remove the blanking plugs.
R  (2) If removed install the new back-up rings (5) and the new seals (6) on the bobbins (4) (Ref. TASK 20-23-21-911-001).
 (3) If removed install the bobbins (4) with the back-up rings (5) and the seals (6) in the brake selector valve (11) (Ref. TASK 20-23-21-911-001).
R  (4) Install the new back-up rings (3) and the new packings (2) on the bobbins (4).
 (5)
 Carefully install the brake selector valve (11) on the manifold assembly (1).

 (6)
 Install the bonding strap (7), the washers (8) and the bolts (9) and TORQUE to between 0.8 and 0.9 m.daN (70.79 and 79.64 lbf.in).

 (7)
 Protect the bonding (Ref. TASK 20-28-00-912-004).

 (8)
 Mark the bolts with PAINTS FOR DETAIL (INTERNAL AND EXTERN AL) (Material No. 07-010).

 (9)
 Remove the blanking caps.

 (10)
 Make sure that the electrical connectors are clean and in the correct condition.

 (11)
 Connect the electrical connector (10) to the brake selector valve (11).

 Subtask 32-42-11-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1GG, 2GG, 3GG, 4GG, 1701GK, 1702GK.
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 C. Aircraft Maintenance Configuration
 (1)
 Connect the PTU isolation coupling (Ref. TASK 29-23-00-860-002).

 (2)
 Remove the container.

 (3)
 Remove the access platform(s).

 (4) Remove the warning notice(s). Subtask 32-42-11-870-050
 D. Bleed the normal braking system (Ref. TASK 32-42-00-870-001).
 5. Close-up
________ Subtask 32-42-11-410-050
 A. Close Access
 (1)
 Apply corrosion protection to the bolt head heads, pipe connectors and the adjacent areas (Ref. TASK 51-75-13-916-002).

 (2)
 Make sure that the work area is clean and clear of tool(s) and other items.
　
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