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A
747-400 MAINTENANCE MANUAL
 OUTBOARD FLAP TRACK - INSPECTION/CHECK
______________________________________
 1.  General_______
 A.  There are two parts to the outboard flap track inspection/check. In the first part you measure the inner and outer diameters of the fuse bolt and its related parts. In the second part you measure the attachment fittings and their related parts.
 B.  This procedure is usually done before the flap track is installed. The flap track must be removed to do the check of the fuse bolt area.
 TASK 27-51-27-206-001
 2.  Outboard Flap Track Inspection______________________________
 A.  Standard Tools and Equipment
 (1)  
Micrometer - 0 to 1 inch (0 to 3 cm), To measure inside and outside dimensions

 (2)  
Micrometer - 1 to 2 inch (2 to 5 cm), To measure inside and outside dimensions

 (3)  
Vernier Caliper

 B.  
References

 (1)  
27-51-27/401, Track - Outboard Flap

 (2)  
IPC 57-22-10, Fig. 1

 C.  
Access

 (1)  
Location Zone 567 Outboard Flap Track Fairing, Outboard Flap, LH, (Track No. 1) 565 Inboard Flap Track Fairing, Outboard Flap LH, (Track No. 2 665 Inboard Flap Track Fairing Outboard Flap, RH, (Track No. 7)

 667  Outboard Flap Track Fairing Outboard Flap, RH, (Track No. 8)
 D.  Procedure
 S 026-002
 (1)  
Remove an outboard flap track (Ref 27-51-27/401).

 S 226-003

 (2)  
Examine the outboard flap track fuse bolt and related parts for worn parts.

 (a)  
Remove the parts to be measured.

 (b)  
Measure the parts.

 NOTE: Use a micrometer and/or a vernier caliper.
____
 (c)  
Compare the measured dimensions to permitted dimensions shown in Fig. 601.

 (d)  
Repair or replace the parts which are not in the tolerance, as shown in Fig. 601.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (e)  Install the parts.
 S 226-004
 (3)  
Examine the attach fitting bearing plates for worn areas.

 (a)  
Let the mounting bolts hold the weight of the flap track.

 (b)  
Make sure that the clearance between the flap track top surface and the bearing plate is in the tolerance shown on Section A-A, Fig. 601.

 (c)  
Measure the clearances as shown in Fig. 601.

 (d)  
If the clearances are not in the permitted limits, examine the parts for worn areas.

 (e)  
Replace the parts if it is necessary.

 (4)  
Install an outboard flap track (Ref 27-51-27/401)

 S 426-005
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

ATTACHMENT FITTING
A  BEARING
SEE A PLATE
SEE B
FLAP TRACK SEE C
A
MOUNTING BOLT
FWD
A B
MOUNTING BOLT
(4 LOCATIONS)

BEARING WASHER
ATTACHMENT FITTING BEARING
BEARING PLATE (2 LOCATIONS)
1
1A B
2
FLANGED
PLAIN  2
FLAP BUSHING
WASHER
TRACK (2 LOCATIONS)  OUTBD
(2 LOCATIONS)
CARRIAGE STOP, OUTBOARD FLAP TRACKS
A-A

1  FLAP TRACK TO ATTACHMENT FITTING WEAR. 2 THE SUM OF THE CLEARANCES A AND B BETWEEN MEASURE WITH THE FLAP TRACK FULLY SUPPORTED THE FLAP TRACK AND THE VERTICAL FLANGE OF BY MOUNTING BOLTS. DESIGN LIMITS 0.002 TO THE BEARING PLATE HAS A DESIGN TOLERANCE
0.045 INCH (0.005 TO 0.114 cm) GAP BETWEEN OF 0.01-0.05 INCH (0.03 TO 0.13 cm). THE BUSHING AND BEARING WASHER. MAXIMUM WEAR MAXIMUM TOLERNCE IS 0.07 INCH (0.25 cm).
0.060 INCH (0.15 cm) GAP. MEASURE FROM
THE FORWARD SIDE OF THE FLAP TRACK, DUE
　
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