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 ALL  ú ú 01 Page 403 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-025
 CAUTION: DO NOT DISARM THE ALTERNATE ELECTRICAL SYSTEM IF THE ELECTRIC
_______ POWER IS ON. IF THE ALTERNATE ELECTRIC POWER IS ON, THE FLAPS COULD MOVE WHEN YOU DISARM THE ALTERNATE ELECTRICAL SYSTEM. THIS COULD CAUSE DAMAGE TO EQUIPMENT.
 (11)
 Push the ALTN FLAPS ARM switch to disarm the system.

 E.
Remove the No-Coast Drag Brake

 S 034-011
 (1)  
Disconnect the torque tube from the no-coast drag brake (Fig. 402):

 (a)  
Remove the three screws (7) that attach the coupling sleeve to the torque tube on the two sides of the drag brake (1).

 (b)  
Move the torque tubes away from the drag brake.

 NOTE:____Do not turn the torque tubes. If you turn the torque tubes, it will be necessary to do the flap system adjustment.
 S 024-012
 (2)  
Remove the no-coast drag brake:

 (a)  
Remove the two bolts (2), washers (6), and nuts (5).

 (b)  
Remove the drag brake from the airplane.

 (c)  
Remove the support (4) and the safety strap (3).

 TASK 27-51-42-014-047
 3.  No-Coast Drag Brake Removal (Alternate Procedure)_________________________________________________
 A. Special Tools and Equipment
 (1)  
Strap Wrench - Commercially Available

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

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 27-51-42
 ALL  ú ú 01 Page 404 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
INBOARD FLAP POWER PACKAGE
SEE A
SEE B
RETAINING  A 
AIR SEAL  SCREW 
(3 LOCATIONS)  SEE  C 
SEE  D  SPLINE  2. BOLT 

TORQUE TUBE COUPLING
6. WASHER
1. NO-COAST  5. NUT DRAG BRAKE
B
FASTENERS SEALANT
(4 LOCATIONS)
7. RETAINING SCREW (3 LOCATIONS)
AIR SEAL
SPLINE COUPLING SLEEVE
SPLINE
D C
No-Coast Drag Brake Installation Figure 402
3.
 SAFETY STRAP

4.
 SUPPORT

TORQUE TUBE
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-51-42
 ALL  ú ú 01 Page 405 ú Oct 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 C.
Access

 (1)  
Location Zone
 137 Body Landing Gear Well, LH

 D.
Prepare for the Removal

 S 864-027
 (1)  Do this task to pressurize hydraulic system No. 1: "Hydraulic System Pressurization" (AMM 29-11-00/201).
 S 864-028
 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.
 (2)  
Put the flap control lever in the 30-unit detent to extend the trailing edge flaps and attach a DO-NOT-MOVE tag.

 S 864-029

 (3)  
Do this task to depressurize hydraulic system No. 1: "Hydraulic System Depressurization" (AMM 29-11-00/201).

 S 864-030

 (4)
Do the step that follows to limit the movement of the torque tubes.

 (a)  
Attach a strap wrench on the torque tubes next to the no-coast drag brake.

 NOTE: The strap wrench must supply approximately 100
____ inch-pounds (11 N-m) of resistance to the torque tubes.
 S 864-031
 (5)  
Push the ALTN FLAPS ARM switch to the ALTN position.
　
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