27-58-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-058
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 CAUTION:_______ EXTEND THE TE FLAPS HYDRAULICALLY TO THE 30-UNIT POSITION
 FOR THE RVDT TRANSMITTER REMOVAL AT THE FLAP TRANSMISSION.  DO
 NOT EXTEND THE TE FLAPS BY THE ELECTRICAL MODE.  IF YOU USE THE
 ELECTRICAL MODE, THE FLAPS WILL NOT GO TO THE CORRECT POSITION
 AND CAN CAUSE DAMAGE TO THE FLAPS WHEN YOU OPERATE THEM IN THE

 HYDRAULIC MODE.
 (1)  Do this task to extend the TE flaps to the 30-units position: "Trailing Edge Flap Extension with Hydraulic Power" (AMM 27-51-00/201).
 NOTE: You must use hydraulic power to extend the flaps to the
____ 30 unit position or you cannot install the RVDT correctly.
 (a)  If you have problems during the 30 unit flap extension, use the steps that follow to extend the flaps: 1) Put the ALTN FLAPS ARM switch on the pilot's center
 instrument panel, to the ALTN position.
 2)  Open these circuit breakers on the Main Power Distribution Panel, P6, and attach DO-NOT-CLOSE tags: a) 6L19, TE FLAP ELEC CONT OTBD b) 6L20, TE FLAP ELEC CONT INBD
 3)  Put the manual override lever on the bypass valve actuator motor, to position 2 (FIG. 401).
 NOTE: There are two manual override levers, one for
____ the inboard system and one for the outboard system. It is only necessary to move the manual override lever for the system you are working on.
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 27-58-01
 ALL  ú ú 01 Page 406 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 4) Put the ALTN FLAPS ARM switch on the pilot's center instrument panel, to the OFF position. 5) Move the flap control lever to the 30 unit detent to extend the TE flaps and attach a DO-NOT-MOVE tag.
 S 864-055
 (2)  
Do this task: "Trailing Edge Flap Deactivation" (Ref 27-51-00/201).

 S 864-003

 (3)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7C10, FLT CONT ELEC 2L AC
 2) 7C11, FLT CONT ELEC 2L DC
 3) 7C12, FLT CONT ELEC 1L AC
 4) 7C13, FLT CONT ELEC 1L DC
 5) 7C14, FLT CONT ELEC 1R AC
 6) 7C15, FLT CONT ELEC 1R DC
 7) 7C16, FLT CONT ELEC 2R AC
 8) 7C17, FLT CONT ELEC 2R DC

 S 014-048
 (4)
Lower the access panel to get access to the applicable RVDT:

 (a)  
581MB, Left Outboard Transmitter

 (b)  
572FB, Left Inboard Transmitter

 (c)  
672FB, Right Inboard Transmitter

 (d)  
681MB, Right Outboard Transmitter

 S 034-004
 (5)
Remove the electrical connector from applicable RVDT transmitter:

 (a)  
DM7891, Left Outboard Transmitter

 (b)  
DM7888, Left Inboard Transmitter

 (c)  
DM7890, Right Inboard Transmitter

 (d)  
DM7893, Right Outboard Transmitter

 S 034-006
 (6)  
Remove the two bolts and washers that attach the RVDT transmitter to the flap transmission.

 (7)  
Remove the RVDT transmitter from the flap transmission.

 S 024-007
 TASK 27-58-01-404-008
 3.  Installation of the RVDT Transmitter at the Flap Transmission (Fig. 401)_____________________________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-51-00/201, Trailing Edge Flap System

 (3)  
AIPC 27-58-01, Fig. 1

 (4)  
SSM 27-58-01

 (5)  
WDM 27-58-11

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