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747-400 MAINTENANCE MANUAL
 2) Turn the transmission until the universal joint stop touches the ball screw nut stop. 3) Make an index mark on the transmission coupler and the housing. 4) On an inboard flap, turn the transmission one full turn plus 19 teeth at the coupler. 5) On an outboard flap, turn the transmission one full turn plus 24 teeth at the coupler.
 6)  Install the torque tubes on the transmission. a) Install the three screws. b) Install the lockwire on the screws.
 (b)
Do this task to pressurize hydraulic systems No. 1 and 4: "Hydraulic System Pressurization" (AMM 29-11-00/201).

 (c)  
Extend and retract the flaps.

 (d)  
Put the flap control lever in the UP detent to retract the flaps.

 (e)  
Make sure the clearance between the ball screw nut and the universal joint is in the limits.

 S 864-025
 (6)  
Put the flap control lever in the 30-unit detent to extend the flaps and attach a DO-NOT-MOVE tag.

 I.  
Put the Airplane Back to Its Usual Condition

 S 864-026
 (1)  
Do this task to depressurize hydraulic systems No. 1 and 4:
 "Depressurize Hydraulic Systems" (AMM 29-11-00/201).

 S 644-027

 (2)
Do this task to lubricate the universal joint and ball screw nut: "Trailing Edge Flap System Lubrication" (AMM 12-21-20/301).

 S 864-028

 (3)  
Do this task to pressurize hydraulic systems No. 1 and 4:
 "Hydraulic System Pressurization" (AMM 29-11-00/201).

 S 864-029

 (4)  
Remove the D0-NOT-MOVE tag and extend and retract the flaps.

 (a)  
Make sure the flaps move smoothly.

 (5)
Put the flap control lever in the UP detent to retract the flaps.

 S 864-031

 (6)  
Do this task to depressurize hydraulic systems No. 1 and 4:
 "Hydraulic System Depressurization" (AMM 29-11-00/201).

 

 S 864-030
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FLAP CONTROL UNIT - REMOVAL/INSTALLATION
________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is a task for the removal and a task for the installation of a flap control unit. There are three flap control units installed in the main equipment center. The left flap control unit is on the E1-2 shelf. The center and right flap control units are on the E2-2 shelf.
 B.  The procedure has these parts:
 (1)
The removal of power from the flap control unit

 (2)
The removal of the flap control unit

 (3)
The installation of the flap control unit

 (4)
The performance of a BITE test with the CMCS.

 TASK 27-51-51-004-001
 2.  Flap Control Unit Removal (Fig. 401)_________________________
 A.  References
 (1) SSM 27-51-01

Flap Control Unit Installation
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
WDM 27-51-11

 B.
Access

 (1)  
Location Zone
 117 Main Equipment Center, LH
 118 Main Equipment Center, RH

 C.
Procedure

 S 864-002
 (1)  
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 024-003
 (2)  Remove the flap control unit from the shelf.
　
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