27-51-02
 ALL  ú ú 01 Page 409 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 644-031
 (5)  
Lubricate the foreflap (AMM 12-21-20/301).

 S 864-016

 (6)  
Pressurize hydraulic system No. 1 (Ref 29-11-00/201).

 S 864-026
 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.
 CAUTION:_______MONITOR THE FLAP MOVEMENT CAREFULLY. THE FLAPS CAN BE DAMAGED BY INCORRECTLY ADJUSTED COMPONENTS.
 (7)  
Move the flap control lever to the FLAP UP detent to retract the flaps.

 S 714-018

 (8)  
Make sure the flaps move freely.

 S 224-019

 (9)  
Make sure that the foreflap trailing edge to midflap clearance is as shown in section C-C (Fig. 401).

 NOTE:____The foreflap to midflap clearance is not adjustable. If the clearance is out of tolerance, there are defective components. Replace the defective components.
 S 094-020
 (10)
 Remove the spoiler actuator locking tool from spoilers or put the system No. 4 FLT CONTROL HYD POWER switch to NORM.

 (11)
 Pressurize hydraulic system No. 4 (Ref 29-11-00/201).

 S 864-022

 (12)
 Move the speed brake to the DOWN position to lower spoilers No. 5 thru 8.

 S 864-023

 (13)
 Release the pressure in hydraulic systems No. 1 and 4 (Ref 29-11-00/201).

 S 864-021
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-51-02
 ALL  ú ú 01 Page 410 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-024
 (14)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7G6, SPEED BRAKE AUTO CONT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-51-02
 ALL  ú ú 02 Page 411 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 INBOARD FOREFLAP-INSPECTION/CHECK
_________________________________
 1.  General_______
 A.  There is one task in this procedure: an inspection of the inboard foreflap.
 B.  In this procedure, you measure the inner or outer diameter of the parts which attach the foreflap lever to the midflap track. The parts include bushings, bearings and bolts.
 C.  You must remove or disconnect the foreflap from the midflap to do this procedure. You usually do this procedure before you install the inboard foreflap.
 TASK 27-51-02-206-001
 2.  Inboard Foreflap Inspection (Fig. 601)___________________________
 A.  Standard Tools and Equipment
 (1)  
Micrometer - 0 to 1 Inch (0 to 3 cm)

 (2)  
Vernier Caliper

 B.  
References

 (1)  
27-51-02/401, Inboard Foreflap

 C.  
Access

 (1)  
Location Zone
 576 Inboard Flap Foreflap, LH
 676 Inboard Flap Foreflap, RH

 D.  
Procedure

 S 026-002
 (1)  
Remove the foreflap (Ref 27-51-02/401).

 S 226-003

 (2)
Examine the parts, which connect the foreflap, for worn areas:

 (a)  
Remove the parts that will be examined.

 (b)  
Use a micrometer or a vernier caliper to measure the parts.

 (c)  
Compare the dimensions you measured with the permitted dimensions shown in Fig. 601.

 (d)  
Replace the parts that are not in the tolerance.

 (e)  
Install the parts.

 (3)  
Install the foreflap (Ref 27-51-02/401).
　
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