(b)  
Make sure the LOW PRESSURE light for the engine driven pump stays on.

 S 792-015
 (11)
 Examine the check valve for leaks.

 S 432-016

 (12)
 Install a lockwire.

 TASK 29-15-71-002-018
 8.  System Pressure Relief Valve Removal (Fig. 201)____________________________________
 A. References
 (1)  
AMM 29-09-00/201, Hydraulic Reservoir Pressurization System

 (2)  
AMM 29-15-00/201, Hydraulic Systems A, B and Standby

 B. Access
 (1)  Location Zone
 216 Main Wheel Well, LH
 217 Main Wheel Well, RH

 C. Procedure
 S 862-044
 (1)  
Remove power from the applicable hydraulic system
 (AMM 29-15-00/201).

 S 862-045

 (2)  
Release pressure from the applicable hydraulic reservoir (AMM 29-09-00/201).

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 S 022-046
 (3)  
Remove the relief valve from the pressure module.

 S 432-047

 (4)
Install the plug in the open port of the pressure module.

 TASK 29-15-71-402-019
 9.  System Pressure Relief Valve Installation (Fig. 201)_________________________________________
 A. Consumable Materials
 (1)  
D00567 Skydrol Assembly Lube - MCS 352

 (2)  
D00568 Fluid - Hydraulic, BMS 3-11

 B. References
 (1)  AMM 29-15-00/201, Hydraulic Systems A, B and Standby
 C. Access
 (1)  Location Zone
 216 Main Wheel Well, LH
 217 Main Wheel Well, RH

 D. Procedure
 S 642-048
 (1)  
Apply assembly lube or hydraulic fluid to the O-rings and backup rings.

 S 432-049

 (2)  
Install the O-rings and the backup rings in each relief valve groove.

 S 642-050

 (3)  
Apply assembly lube or hydraulic fluid to the threads of the relief valve for easier installation.

 (4)  
Remove the plug.

 (5)  
Install the relief valve in the pressure module housing.

 (6)  
Tighten the relief valve to 50-200 pound-inches.

 S 032-051
 S 422-052
 S 432-053
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 (7)  S 862-054Pressurize the applicable hydraulic system (AMM 29-15-00/201).
 (8)  S 792-055Examine the relief valve for leaks.
 (9)  S 862-056Remove power from the applicable hydraulic system (AMM 29-15-00/201).
 S 432-057

 (10) Install the lockwire on the relief valve.

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 STANDBY HYDRAULIC SYSTEM MODULAR UNIT - MAINTENANCE PRACTICES
_____________________________________________________________
 1.  General_______
 A.  There are six tasks in this procedure. The tasks include the removal and installation of the standby hydraulic system modular unit (referred to as the standby pressure module) and its components. These are the tasks:
 (1)  
The removal of the standby pressure module

 (2)  
The installation of the standby pressure module
　
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