29-22-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 S 865-225
 (68) Close this circuit breaker on the P11 panel:
 (a)  11D31, HYDRAULICS PTU CONT
 S 215-226
 (69)
 Make sure the manual lever/position indicator on the PTU control valve moves to the CLOSED position.

 S 215-227

 (70)
 Make sure you can not hear the operation of the PTU.

 S 215-228

 (71)
 Make sure the POWER XFER UNIT message is shown on EICAS.

 S 865-229

 (72)
 Push the ECS/MSG switch on the EICAS maintenance panel on the P61 panel. Push the AUTO EVENT READ switch, then push and hold the ERASE switch for approximately 3 seconds for each page of the EICAS messages.

 S 215-230

 (73)
 Make sure the POWER XFER UNIT message is not shown on EICAS.

 S 865-231

 (74)
 Operate the hydraulic service cart to decrease the pressure in the right hydraulic system to zero.

 S 865-336

 (75)
 Make sure that the hydraulic ground service connections are removed from the left hydraulic system.

 S 865-337

 (76)
 Make sure that the left reservoir quantity reads between 0.75 to

 1.00 on EICAS.

 G.
System Test for the Left Hydraulic System Flow Limiter

 S 865-232
 (1)  
Make sure the flight controls are in the neutral position.

 S 865-233

 (2)  
Make sure the flap lever on the control stand is in the ZERO detent position and the flaps are in the fully retracted position.

 S 865-234

 (3)  
Make sure the arming switches for the flap and slat alternate drive on the pilots' main instrument panel, P3, are in the off position.

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A

757
MAINTENANCE MANUAL

 (4)  S 865-235Make sure the position selector switch for the flap and slat alternate drive on the pilot's main instrument panel, P3, is in the NORM position.
 (5)  S 865-236Make sure the landing gear selector handle on the pilot's main instrument panel, P3, is in the OFF position.
 (6)  S 865-237Make sure the control switches for the left and right yaw dampers on the overhead panel, P5, are in the INOP position.
 (7)  S 865-238Make sure these switches on the right side panel, P61, are in the ON position: (a) Flight control shutoff valves for the left system (b) Flight control shutoff valves for the right system
 (8)  S 215-303Make sure the switch indicator lights are not on.
 (9)  S 865-239Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags: (a) 11G12, FSEU-1 PWR, FLAP SLAT ELEC UNIT 1 PWR OR FLAP SLAT ELEC UNIT 1 POWER (b) 11H23, FLAP/SLAT ALTN DR SHUTOFF ARM
 S 865-250

 (10) Move the bypass valve for the leading edge (LE) slat drive to POSITION 1 with the manual valve handle.
 NOTE: The bypass valve is in the left forward wing/body fairing.
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