(b)  
Make sure there is 0 vdc between DV236A, pins 1 and 2.

 S 865-176
 (16) Put the HYD PUMPS ENGINE switch for engine 1 (2, 3, 4), on the P5 panel, to the ON position.
 CAUTION: DO NOT MOVE THE POSITION INDICATOR ON THE HYDRAULIC
_______ SHUTOFF VALVE WHEN THE VALVE HAS ELECTRICAL POWER. DAMAGE TO THE VALVE CAN OCCUR.
 (a)  Make sure the position indicator on the hydraulic shutoff valve is in the OPEN position (Fig. 503).
 S 865-201
 WARNING:_______DO NOT TURN THE FIRE SWITCH. IF YOU TURN THE FIRE HANDLE, THE CONTENTS OF THE FIRE BOTTLE WILL BE RELEASED, AND MAY HARM PERSONS OR DAMAGE EQUIPMENT.
 (17) Pull the fire switch, for engine 1 (2, 3, 4), out.
 NOTE: When you pull the fire switch, it is necessary to push the
____
 manual override button behind the fire switch.

 (a)  
Make sure the FIELD OFF light in the generator field manual reset switch, for engine 1 (2, 3, 4), comes on after 5 seconds.

 (b)  
Check the ECS SUPPLY SYSTEM EICAS maintenance page to make sure the PRSOV, on engine 1 (2, 3, 4), is in the closed position.

 (c)  
Make sure the engine No. 1 (2, 3, 4) fuel spar valve is in the closed position.

 (d)  
Make sure there is 28 vdc between DV236A, pins 1 and 2.

 (e)  
Make sure the position indicator on the hydraulic shutoff valve moves to the CLOSED position and the motor stops.

 S 865-203
 (18) Push the HYD switch on the EICAS DISPLAY SELECT module on the P10 glare shield panel.
 (a)  Make sure the HYD synoptic display shows the hydraulic shutoff valve is closed.
 S 865-180
 (19) Push the fire switch in, for engine 1 (2, 3, 4), to the closed position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 865-202
 (20) Put the GEN CONT switch, for engine 1 (2, 3, 4), to the ON position.
 (a)  
Check the ECS SUPPLY SYSTEM EICAS maintenance page to make sure the PRSOV, on engine 1 (2, 3, 4), is open.

 (b)  
Push in the START switch, for engine 1 (2, 3, 4), to close the PRSOV.

 (c)  
Make sure the position indicator on the hydraulic shutoff valve moves to the OPEN position and the motor stops.

 (d)  
Make sure the HYD synoptic shows the shutoff valve is open.

 S 865-198
 (21)
 Make sure the engine No. 1 (2, 3, 4) fuel spar valve is in the open position.

 S 865-200

 (22)
 Put the HYD PUMPS ENGINE switch for engine 1 (2, 3, 4) in the OFF position.

 S 865-206

 (23)
 Set the FUEL CONTROL switch, for engine 1 (2, 3, 4), to the CUTOFF position.

 (a)  Make sure the engine No. 1 (2, 3, 4) fuel spar valve is in the closed position.
 S 865-207
 (24)
 Release the pressure from the pneumatic system (AMM 36-00-00/201).

 S 865-182

 (25)
 Open these circuit breakers and attach DO-NOT-CLOSE identifiers.

 (a)  P6 Main Power Distribution Panel
 1) 6J18, ENG START AIR CONT

 S 435-184
 (26)
 Connect the electrical connectors, P94 and P104, to the engine 1 (2, 3, 4) start valve V351 (AMM 80-11-02/401).

 S 435-174

 (27)
 Connect electrical connector DV236A to the hydro-mechanical unit V236.

 S 865-186

 (28)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P6 Main Power Distribution Panel
 1) 6J18, ENG START AIR CONT

 S 865-187
 (29) Set the FUEL CONTROL switch, for engine 1 (2, 3, 4), to the CUTOFF position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 04 Page 513 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 415-188
 (30)
 Close the forward thrust reverser to strut mid fairing access doors (AMM 54-62-00/201).
　
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