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 NOTE: When it is opened, the PRV will stay open.
____
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE B
PRV CONTROLLER
SENSE LINE
PRECOOLER
PRV
SEE A
A
FWD
VALVE POSITION INDICATION
MANUAL OVERRIDE DRIVE
1 2 3
B
Pressure Regulating Valve (PRV) Override Figure 502
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 795-013-N00 WARNING:_______YOU MUST BE VERY CAREFUL WHEN YOU FIND A LEAK. THE BLEED AIR
 LEAKAGE IS VERY HOT AND CAN CAUSE INJURY TO PERSONS.
 (5)  Examine the pneumatic system ducts and the components for leaks.
 NOTE:____ Leakage of air is not permitted at the couplings.
 (6)  S 795-014-N00Examine the nacelle anti-ice duct for leaks.
 CAUTION:_______ IF HOT AIR (APPROXIMATELY 350°F) IS USED, DO NOT OPEN THE ANTI-ICE VALVE OF THE ENGINE INLET FOR MORE THAN 30 SECONDS FOLLOWED BY A TIME TO BECOME COOL. DAMAGE TO THE INLET COWL CAN OCCUR.
 (a)  Open the anti-ice valve. 1) Put the applicable NACELLE ANTI-ICE 1, 2, 3, and 4 switch in the ON position. 2) Make sure NAI shows in green to the left of the applicable engine N1 indication on the main EICAS.
 WARNING:_______ YOU MUST BE VERY CAREFUL WHEN YOU FIND A LEAK. THE BLEED AIR LEAKAGE IS VERY HOT AND CAN CAUSE INJRY TO PERSONS.
 (b)  Examine the nacelle anti-ice duct for leaks.
 NOTE:____ Leakage of air is not permitted at the couplings.
 (c)  Close the anti-ice valve. 1) Put the applicable NACELLE ANTI-ICE 1, 2, 3, and 4 switch in the OFF position. 2) Make sure NAI does not show in green to the left of the applicable engine N1 indication on the main EICAS.
 (7)  S 865-015-N00Push the START switch into the off position.
 (8)  S 865-014-N00Remove pneumatic power (AMM 36-00-00/201).
 (9)  S 365-015-N00Repair the leaks and do the test again as it is necessary.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
E. Put the Airplane Back to Its Usual Condition
 S 865-016-N00
 (1)  
Push the applicable ENGINE BLEED switch to the OFF position.

 S 865-017-N00

 (2)  
Push the ISLN VALVE switch, which was closed, to the open position.

 S 865-234-N00

 (3)  
Open this circuit breaker that follows:

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

 S 445-019-N00
 (4)  
Do the activation procedure for the HPSOV (AMM 36-11-05/201).

 S 435-020-N00

 (5)  
Remove the cap from the sense line port in the precooler.

 S 435-123-N00

 (6)  
Connect the sense line for the PRV controller to the precooler
 (Fig. 502).

 S 435-021-N00

 (7)  
Remove the caps from the electrical connector DV351 and the start
 valve.

 S 435-124-N00

 (8)  
Connect the electrical connector DV351 to the start valve
 (Fig. 501).

 

 S 415-128-N00
 WARNING: OBEY THE INSTRUCTIONS IN 78-31-00 WHEN YOU CLOSE THE THRUST
_______
 REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO
 PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

 (9)  
Close the thrust reversers (AMM 78-31-00/201).
　
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