4. Procedure
_________ (Ref. Fig. 401/TASK 29-12-38-991-001) Subtask 29-12-38-020-050
 A. Removal of the Check Valve CAUTION : USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN
_______ YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU USE THE SECOND WRENCH, YOU WILL NOT LOOSEN OR TIGHTEN THE UNION TOO MUCH.
 (1)
 Hold the check valve (3) and disconnect the end-fitting (4).

 (2)
 Hold the tee-fitting (1) and loosen and remove the check valve (3).

 (3)
 Remove and discard the O-ring (2).

 (4)
 Put blanking plugs on the check valve (3), the disconnected end-fitting (4) and the open port of the tee-fitting (1).

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 RAT Delivery Check Valve
 Figure 401/TASK 29-12-38-991-001

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 TASK 29-12-38-400-001
 Installation of the Check Valve (2055GM)

 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific container No specific warning notices No specific Torque Wrench : range 1.00 to 10.00 m.daN
 (8.00 to 75.00 lbf.ft)
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 02-003  F NSA 307110 TYPE 4 HYDRAULIC FLUID (PHOSPHATE ESTER BASE) (Ref. 20-31-00)
 C. Expendable Parts
 -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
O-ring  29-12-03 12B-290
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 D. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-12-29-611-001 Fill the Hydraulic Fluid Reservoir with a Hand Pump 12-12-29-611-002 Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
 Configuration before Maintenance Action 29-00-00-910-002 Safety Procedures of the Hydraulic System 29-10-00-863-003 Pressurize the Blue Hydraulic System with a Ground
 Power Supply 29-10-00-864-003 Depressurize the Blue Hydraulic System 29-14-00-614-001 Depressurization of the Hydraulic Reservoirs 29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through
 the Ground Connector
 29-22-00-720-001  Operational Check of RAT Manual Deployment, Functional Check of RAT using Ground Test Unit and Check of Filter Indicator
 29-12-38-991-001  Fig. 401
 3. Job Set-up
__________
 Subtask 29-12-38-860-051
 A. Aircraft Maintenance Configuration
 WARNING : OBEY THE HYDRAULIC SAFETY PROCEDURES.
_______
 (1)
 Obey the hydraulic safety procedures (Ref. TASK 29-00-00-910-002).

 (2)
 Make sure that the Blue hydraulic system is depressurized and put it in the maintenance configuration. (Ref. TASK 29-00-00-864-001).

 (3)
 Make sure that the reservoir of the Blue hydraulic system is depressurized. (Ref. TASK 29-14-00-614-001).

 (4)
 Make sure that the access door 195BB is open.

 (5)
 Make sure that the container is in position.

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 (6) Make sure that the warning notices are in position to tell persons not to pressurize the Blue hydraulic system:
 -in the cockpit on the hydraulic section 40VU of the overhead panel, - on the ground service panel of the Blue hydraulic system.
 Subtask 29-12-38-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU HYD/HYD PWR/B WARN/& CTL 2702GJ C12 123VU B HYD/ELEC PUMP 2701GJ AB09
 4. Procedure
　
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