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 NOTE: The left hydraulic system supplies power to
____ the middle PCU.
 The right hydraulic system supplies power to the outboard PCU.
 The center hydraulic system supplies power to the inboard PCU.
 c)  Do the Hydraulic System Gross Internal Leakage Check (AMM 29-11-00/601).
 3)  Do the Elevator Pressure Bypass Valve Test again until the trailing edge of the elevator does not move above the neutral position mark.
 (h)  Use the tail flight control shutoff valve to remove the pressure from the right hydraulic system.
 NOTE: The trailing edge of the elevator will start to move
____ up quickly and then it will move slower at the end of its travel.
 (i)  Make sure the trailing edge of the elevator is at a minimum of
 0.5 inch (13 mm) above the neutral position mark.
 (j)  Do the steps that follow if the elevator trailing edge is not a minimum of 0.5 inch (13 mm) above the neutral position mark. 1) Make sure the left and center hydraulic systems are
 pressurized. 2) Make sure the right hydraulic system is not pressurized. 3) Make sure the elevator PCU pogos are correctly positioned. 4) If it is necessary, replace the items that follow in the
 sequence given. a) The pressure reducer bypass valve for the left hydraulic system. b) The left elevator PCU relief valve (internal to the PCUs) for the middle PCU. c) The left elevator PCU relief valve (internal to the PCUs) for the inboard PCU.
 5)  Do the Elevator Pressure Bypass Valve Test again until the trailing edge of the elevator is at a minimum of 0.5 inch (13 mm) above the neutral position mark.
 E.  Put the Airplane Back to Its Usual Condition (Procedure 1)
 S 865-187
 (1)  Remove the power from the left, right, and center hydraulic systems if it is not necessary (AMM 29-11-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 485-284
 (2)  
Remove the pogo tools from the PCU pogos.

 S 215-206

 (3)
Make sure that these circuit breakers on the P11 panel are closed:

 (a)  
11B19 or 11A19, STAB TRIM ALT (IF INSTALLED)

 (b)  
11C12, STAB TRIM SHUTOFF LEFT

 (c)  
11C13, STAB TRIM SHUTOFF RIGHT

 (d)  
11H11 or 11C05, STAB TRIM CONT L

 (e)  
11H20, STAB TRIM CONT R

 S 215-207
 (4)  
Make sure that the L, R, and C FLT CONTROL SHUTOFF switches on the P61 panel are at the ON position.

 S 215-208

 (5)  
Make sure that the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the P10 panel are in the NORM position.

 S 415-209

 (6)  
Close the left and right access panels for the elevator PCAs, 335DB and 345DB (AMM 06-42-00/201).

 F.
Prepare for the Test (Procedure 2 - Tee and Pressure Gage Method)

 S 865-299
 (1)  Make sure pressure is removed from the left, right and center hydraulic systems (AMM 29-11-00/201).
 S 015-435
 WARNING: STAY OFF THE SERVICE ACCESS DOOR, 311AL, AND THE ACCESS DOOR
_______ FOR THE CONTROLS BAY, 313AL. YOUR WEIGHT CAN CAUSE THE SPRING-LOADED LATCHES TO RELEASE. IF YOU FALL THROUGH THE DOOR, INJURY CAN OCCUR.
 (2)  
Open the access door for the forward stabilizer compartment, 311AL (AMM 06-42-00/201).

 G.
Elevator Pressure Bypass Valve Test (Procedure 2)

 S 495-307
 (1)  Do the steps that follow to install the tee fitting and the pressure gage in the hydraulic line.
 NOTE: When you disconnect the hydraulic lines, use a bucket to
____
 catch the hydraulic fluid that spills.

 (a)  
Find the titanium pressure line at the pressure reducer bypass valve.

 (b)  
Find the location where the titanium pressure line joins the flexible line.

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 ALL  ú ú 11 Page 582O ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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