S 015-028-N00

 (4)  
Open the left core cowl panel (AMM 71-11-06/201).

 S 015-029-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU OPEN THE
_______ THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (5)  Open the left thrust reverser (AMM 78-31-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 015-004-N00
 (6)  Do this task to open the applicable access door: "Nacelle and Engine-to-Wing Fairing Access Doors and Panels" (AMM 06-09-09/201). Refer to the table that follows for the correct access door:
 ~............................................................ | Strut | Access Door | Name of the Access Door | ..............................................................
 |  1  |  451AR  |  TAI Valve Access Door  |
 |  2  |  461AR  |  TAI Valve Access Door  |
 |  3  |  471AR  |  TAI Valve Access Door  |
 |  4  |  481AR  |  TAI Valve Access Door  |

 2...........….................…..............................1
 S 035-005-N00
 (7)  
Remove the vent port plug of the barometric switch.

 S 485-006-N00

 (8)  
Connect the vacuum pump line to the vent port of the barometric switch.

 S 215-007-N00

 (9)  
Make sure that the shutoff valve for nacelle zone ventilation is in the open position (Fig. 501, view B).

 S 215-008-N00

 (10)
 Make sure that the locking pin for manual override on the shutoff valve is pulled out (Fig. 501, view B).

 (a)  
Install the cotter pin in the locking pin.

 S 785-009-N00
 (11)
 Slowly increase the vacuum to the vent port of the barometric switch until you have 25,000 feet of altitude at standard atmosphere.

 S 215-010-N00

 (12)
 Make sure that the shutoff valve stays open.

 S 865-011-N00

 (13)
 Open the correct wing isolation valve:

 (a)  
ENGINES 1 OR 2; Open the L ISLN valve switch on the P5 pilots' overhead panel.

 (b)  
ENGINES 3 OR 4; Open the R ISLN valve switch on the P5 pilots' overhead panel.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 865-012-N00
 (14) Do one of the two tasks:  " Pressurize the Pneumatic System with a Ground Air Source" or "Pressurize the Pneumatic System with the APU" (AMM 36-00-00/201):
 (a)  
If the ground cart is used, apply 25-35 psig of pressure to the pneumatic system.

 (b)  
If you use the APU, supply pneumatic pressure to the system: 1) Push the ECS switch on the panel for the EICAS display select.

 2)  Turn the air conditioning packs 1, 2, or 3 on the P5 overhead panel to the ON position.
 NOTE: Make sure the main EICAS display shows the
____ applicable (left or right) DUCT PRESS between 25 and
 35.
 S 865-013-N00
 (15) Open the pressure regulating and shutoff valve (PRSOV):
 (a)  
Open the 6J18 ENG START AIR CONT circuit breaker on the P6 main power distribution panel.

 (b)  
Disconnect the electrical connector DV351 from the start valve receptacle.

 (c)  
Close the 6J18 ENG START AIR CONT circuit breaker on the P6 main power distribution panel.

 (d)  
Do this task to open the applicable access door: "Nacelle and Engine-to-Wing Fairing Access Doors and Panels" (AMM 06-09-09/201). Refer to the table that follows for the correct access door:

 ~............................................................. | Strut | Access Door | Name of the Access Door | ...............................................................
　
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