(1)  
Location Zone
 412 Engine 1 - HPC Aft Case 3 o'clock
 422 Engine 2 - HPC Aft Case 3 o'clock
 432 Engine 3 - HPC Aft Case 3 o'clock
 442 Engine 4 - HPC Aft Case 3 o'clock

 (2)  
Access Panel
 416 Right Thrust Reverser Half - Engine 1
 426 Right Thrust Reverser Half - Engine 2
 436 Right Thrust Reverser Half - Engine 3
 446 Right Thrust Reverser Half - Engine 4

 E.  
Install the Position Switch for the TVBCA Valve

 (1)  
Remove the protection caps.

 S 644-017-N00

 (2)  
Lubricate the threads of the bolts, which attach the position switch, with engine oil.

 S 434-008-N00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ENGINES WITH PHASE 3 CHANGES OR ú

 75-24-13
 PRE-PW-SB 75-107  ú ú N02 Page 404 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 424-009-N00
 (3)  Install the position switch to the TVBCA valve with the bolts.
 (a)  Tighten the bolts to 36-40 pound-inches (4.1-4.5
 newton-meters).

 S 434-018-N00
 (4)  Connect the electrical connector to the position switch.
 S 434-010-N00
 CAUTION: WHEN YOU USE THE STRAP WRENCH, YOU MUST ADJUST THE TORQUE
_______
 WRENCH VALUE (AMM 70-23-00/201). IF YOU DO NOT ADJUST THE
 TORQUE WRENCH VALUE, THE INCORRECT TORQUE CAN CAUSE DAMAGE TO
 THE ELECTRICAL CONNECTOR AND UNSATISFACTORY LIGHTNING
 PROTECTION.

 (5)  Use the strap wrench to tighten the electrical connector to 30-35
 pound-inches (3.4-4.0 newton-meters).

 (a)  Install the lockwire (AS3214-01) to the electrical connector.
 S 034-025-N00
 (6)  
If it is necessary, remove the shipping cotter pin and tag from the
 face of the position switch.

 F.
Put the Airplane Back to Its Usual Condition.

 S 414-024-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 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.

 (1)  
Close the right thrust reverser (AMM 78-31-00/201).

 S 414-020-N00

 (2)  
Close the right core cowl panel (AMM 71-11-06/201).

 (3)  
Close the right fan cowl panel (AMM 71-11-04/201).

 S 444-021-N00

 (4)  
Do the activation procedure for the thrust reverser
 (AMM 78-31-00/201).

 S 864-012-N00

 (5)  
For the applicable engine, remove the DO-NOT-CLOSE tags and close
 these circuit breakers as follows:

 S 414-019-N00
 (a)  P6 Main Power Distribution Panel
 1) 6G1 FUEL SHUTOFF VALVE ENG 1
 2) 6G15 SCU ALT PWR ENG 1

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ENGINES WITH PHASE 3 CHANGES OR ú

 75-24-13
 PRE-PW-SB 75-107  ú ú N03 Page 405 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
3) 6G23 ENG SCU 1
 4) 6G2 FUEL SHUTOFF VALVE ENG 2
 5) 6G16 SCU ALT PWR ENG 2
 6) 6G24 ENG SCU 2
 7) 6G3 FUEL SHUTOFF VALVE ENG 3
 8) 6G17 SCU ALT PWR ENG 3
 9) 6G25 ENG SCU 3
 10) 6G4 FUEL SHUTOFF VALVE ENG 4
 11) 6G18 SCU ALT PWR ENG 4
 12) 6G26 ENG SCU 4

 S 714-013-N00
 (6)  Do the test of the TVBCA Valve Position Switch that is shown in the Power Plant Test Reference Table (AMM 71-00-00/501).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ENGINES WITH PHASE 3 CHANGES OR ú

 75-24-13
 PRE-PW-SB 75-107  ú ú N03 Page 406 ú Jun 18/99
　
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