S 865-359

 (6)  
Make sure the horizontal stabilizer is at 6 units of trim by setting the "B" dimension at the stabilizer jackscrew to 15.89 +/- 0.01 inches (403.6 +/- 0.3 mm) (Fig 502).

 S 865-360

 (7)  
Put the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the P10 panel to the CUTOUT position.

 S 865-361

 (8)  
Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags:

 (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

 D.
Elevator Pressure Bypass Valve Test (Procedure 1 - Pogo Tool Method)

 S 865-352
 WARNING: MAKE SURE ALL HOLDING TOOLS AND OTHER OBSTRUCTIONS ARE REMOVED
_______ FROM THE SYSTEM. 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.
 (1)  
Make sure that the left, right and center hydraulic systems are pressurized (AMM 29-11-00/201).

 S 865-185

 (2)  
Make sure the horizontal stabilizer is at 6 units of trim by setting the "B" dimension at the stabilizer jackscrew to 15.89 +/-0.01 inches (403.6 +/- 0.3 mm) (Fig 502).

 S 865-280

 (3)  
Use the Captain's control column to do the steps that follow:

 (a)  
Move the control column fully forward then fully aft, 5 times.

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757 MAINTENANCE MANUAL
 (b)  
Release the control column.

 (c)
Let the control column return to a centered position. S 725-283

 WARNING:_______ BE CAREFUL WHEN YOU DO THE ELEVATOR PRESSURE BYPASS VALVE TEST.
 THE HYDRAULIC SYSTEM IS FULLY PRESSURIZED AND THE AILERONS,
 ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER CAN
 MOVE QUICKLY.  INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN

 OCCUR WHEN THESE CONTROL SURFACES MOVE.
 (4)  
Do the steps that follow to make sure the elevator pressure bypass valve operates correctly:

 (a)  
Put a 2 inch (50 mm) piece of tape on the side of the airplane adjacent to the left elevator trailing edge. Put the tape in the center and vertically along the length of the index plate.

 (b)  
Make a mark on the tape to show the neutral position of the left elevator.

 (c)  
Make a mark on the tape 0.5 inch (13 mm) above the neutral position mark.

 (d)  
Use the elevator pogo tools, B27032-9, to extend the pogos on the left inboard and the left outboard PCU's to 0.25 +/- 0.01 inch (6.4 +/- 0.3 mm).

 NOTE: Make sure you do not move the elevator input crank
____ when you extend or compress the pogos.
 (e)  
Make sure the trailing edge of the left elevator moves down.

 (f)  
Use the elevator pogo tool, B27032-9, to compress the pogo on the left middle PCU 0.25 | 0.01 inch (6.4 | 0.3 mm).

 NOTE: The trailing edge of the elevator may move up but it
____ should not move above the neutral position mark.
 (g)  If the trailing edge of the elevator moves to or above the neutral position mark, do the steps that follow: 1) Make sure the elevator PCU pogos are positioned correctly. 2) If the elevator PCU pogos are correctly positioned, do
 these steps:
 a) Remove the pogo tools, B27032-9, from the pogos.

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757 MAINTENANCE MANUAL
 b)  With one hydraulic system pressurized at a time, move the elevator up and down to make sure each PCU will operate.
　
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