S 034-014
 (2)  
Put plugs in the lines and caps on the ports.

 S 034-015

 (3)  
Remove the bolts and washers (3 locations) that attach the bypass valve to the support bracket.

 S 024-016

 (4)  
Remove the bypass valve.

 TASK 27-31-13-424-017
 3. Install the Pressure Reducer Valve and the Bypass Valve
_______________________________________________________
 A. General
 (1)  This task contains two procedures, one to install the pressure reducer valve and one to install the bypass valve. Because this task contains two procedures, only the applicable group of steps must be done.
 To start one of these procedures, do the group of steps that is necessary to install the components. Then, do the "Put the Airplane Back to Its Usual Condition" group of steps.
 B. Equipment
 (1)  Pogo Compression/Extension Tool - B27032-9
 (2 Necessary)

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 C.
D.
E.
F.
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757 MAINTENANCE MANUAL
 (2)  Scale - B27039-1
 NOTE: This will be used to do linear measurements for the
____ stabilizer ballscrew.
Consumable Materials
 (1)
D00153 Hydraulic Fluid - BMS 3-11References

 (1)  
06-42-00/201, Empennage Access Doors and Panels

 (2)  
12-12-01/301, Hydraulic Systems

 (3)  
24-22-00/201, Electrical Power - Control

 (4)  
27-31-00/501, Elevator Control System

 (5)
31-41-00/201, EICAS Indicating and Crew Alerting SystemAccess

 (1)  Location Zones 211/212 Control Cabin 311/312 Area Aft of Pressure Bulkhead to BS 1787.45
 (2)  Access Panel 311AL  Pressure Reducer Valves and Bypass Valve

Install the Pressure Reducer Valve (Fig. 401)
 S 424-018
 (1)  
Install the bolts and washers (3 locations) that attach the pressure reducer valve to the support bracket.

 S 434-019

 (2)  
Remove the plugs from the lines and the caps from the ports (3 locations).

 S 434-020

 (3)  
Connect the hydraulic lines to the pressure reducer valve.

 S 434-021

 (4)  
Connect the electrical connectors to the pressure reducer valve (2 locations).

 S 714-022

 (5)  
Do a test on the pressure reducer installation with these steps:

 (a)  
Make sure that the L, R, and C FLT CONTROL SHUTOFF valve switches on the P61 panel are at the ON position.

 WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES
_______ WHEN HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
 (b)  Pressurize the left, right, and center hydraulic systems (Ref 29-11-00/201).
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757
MAINTENANCE MANUAL

 (c)  
Do the EICAS status/maintenance message erase procedure (Ref 31-41-00/201).

 (d)  
Make sure that the ELEV L HYD PRESS message is not shown on the EICAS display.

 (e)  
Put the L FLT CONTROL SHUTOFF valve switch on the P61 panel to the OFF position.

 (f)  
Make sure that the ELEV L HYD PRESS message is shown on the EICAS display, and the ELEV C HYD PRESS message is not shown on the EICAS display.

 (g)  
Put the C FLT CONTROL SHUTOFF valve switch on the P61 panel to the OFF position.

 (h)  
Make sure that the ELEV C HYD PRESS message is shown on the EICAS display, and the ELEV R HYD PRESS message is not shown on the EICAS display.

 (i)  
Put the R FLT CONTROL SHUTOFF valve switch on the P61 panel to the OFF position.
　
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