D.
Install the Power Unit (Fig. 401)

 S 414-020-N00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______
 REVERSER. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO
 PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.

 (1)  Make sure the thrust reversers are closed (AMM 78-31-00/201).
 S 864-009-N00
 CAUTION: DO NOT INSTALL OR FILL THE POWER UNIT WITH THE THRUST REVERSER
_______ IN THE OPEN POSITION. IF YOU DO THIS, YOU WILL FILL THE POWER UNIT TOO MUCH DURING SERVICING PROCEDURE. TOO MUCH HYDRAULIC FLUID IN THE POWER UNIT CAN CAUSE THE HYDRAULIC LINES TO BREAK.
 (2)  Attach the power unit to the strut with the bolts and washers.
 (a)  Make sure the bolts are in the correct location from the record made when they were removed.
 S 434-010-N00
 (3)  
Connect the hydraulic lines to the RH and LH ports on the power
 unit.

 (4)  
Turn the vent plug counter clockwise until it stops.

 (5)  
Install the lockwire on the vent plug.

 (6)  
Connect the electrical connectors to the power unit.

 S 424-021-N00
 S 424-022-N00
 S 434-012-N00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. THRUST REVERSERS WITH COWL OPENING POWER ú

 78-31-05
 UNITS  ú
 ú N01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 405Jun 18/01 

////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 614-013-N00
 (7)  Do the servicing procedure for the Thrust Reverser Cowl Opening Power Unit (AMM 12-12-04/301) if it is necessary.
 (a)  Use the sight plug on the opening power unit to do a check of the hydraulic fluid level.
 S 014-030-N00
 (8)  
Access the L (R) Main Equipment Center, E1 (E2)

 S 864-031-N00

 (9)  
For the applicable engine(s), open these circuit breakers and attach the DO-NOT-CLOSE tags:

 (a)  
On the left Power Distribution Panel, P414:
 1) 414D19, ENG 1 COWL DOOR CONTROL
 2) 414E16, ENG 1 COWL DOOR POWER UNIT
 3) 414D20, ENG 2 COWL DOOR CONTROL
 4) 414A16, ENG 2 COWL DOOR POWER UNIT

 (b)  
On the right Power Distribution Panel, P415:
 1) 415E15, ENG 3 COWL DOOR CONTROL
 2) 415E19, ENG 3 COWL DOOR POWER UNIT
 3) 415E16, ENG 4 COWL DOOR CONTROL
 4) 415E22, ENG 4 COWL DOOR POWER UNIT

 S 864-014-N00
 CAUTION: MAKE SURE THE MANUAL SELECT KNOBS ARE IN THE POSITION FOR A
_______ NORMAL OPERATION BEFORE YOU APPLY THE ELECTRICAL POWER TO THE POWER UNIT. IF YOU DO NOT DO THIS, YOU CAN CAUSE DAMAGE TO THE POWER UNIT.
 (10)
 Supply electrical power (AMM 24-22-00/201).

 S 714-015-N00

 (11)
 Do the Thrust Reverser Open and Close (Power Method) procedure four times for each thrust reverser half (AMM 78-31-00/201).

 (12)
 Make sure the thrust reverser opens and closes smoothly.

 S 214-024-N00

 (13)
 Do a check for hydraulic fluid leaks.

 E.
Put the Airplane Back to Its Usual Condition.

 (1)  
Install the forward strut fairing (AMM 54-62-04/401).

 S 444-025-N00

 (2)  
Do the activation procedure for the thrust reverser
 (AMM 78-31-00/201).

 S 714-023-N00
 S 414-016-N00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. THRUST REVERSERS WITH COWL OPENING POWER ú

 78-31-05
 UNITS  ú
 ú N01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 406Oct 10/95 

S 864-017-N00
 (3) Remove electrical power if it is not necessary (AMM 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
　
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