27-51-01
 ALL  ú ú 02 Page 520 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 M. Put the Airplane Back to its Usual Condition.
 S 865-060
 (1)  
Pressurize hydraulic system No. 4 (Ref 29-11-00/201).

 S 865-061

 (2)
Put the flap control lever in the UP detent to retract the flaps.

 S 415-062

 (3)  
Install the flap track fairing access panels

 -563BB, 563CB, 563DB, and 563EB (Track No. 3)
 -561AB, 561BB, 561CB, and 561DB (Track No. 4)
 -661AB, 661BB, 661CB, and 661DB (Track No. 5)
 -663BB, 663CB, 663DB, and 663EB (Track No. 6).
 S 095-063
 (4)  
Remove the spoiler actuator locking tools or open the flight control shutoff valves for hydraulic system No. 4.

 S 865-064

 (5)  
Put the speed brake control lever in the DOWN detent to lower spoilers No. 5 thru 8 above the inboard flaps.

 (6)
Release the pressure from the hydraulic system (Ref 29-11-00/201).

 S 865-066

 (7)  
Close the 7G6 SPEED BRAKE AUTO CONT circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 865-065
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 27-51-01
 ALL  ú ú 02 Page 521 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 INBOARD FLAP - INSPECTION/CHECK
_______________________________
 1.  General
_______
 A.  The inboard flap inspection procedures are in this section. The procedures contain the data necessary to do a check of the midflap tracks, bearings, and rollers. It also has the data necessary to do a check of the pivot points of the aftflap arms in the midflap.
 B.  The check measures the inner and/or outer diameters of the bushings, bearings, rollers and arms. The height and width of the midflap track are also measured.
 C.  To do the check, the inboard flaps must be removed from the airplane. The aftflap must be removed from the midflap. The check is usually done before the inboard flap is installed.
 TASK 27-51-01-206-001
 2.  Do A Check Of The Inboard Flap (Fig. 601)
______________________________
 A.  Standard Tools and Equipment
 (1)  
Micrometer - 0 to 1 Inch (0 to 3 cm)

 (2)  
Micrometer - 1 to 2 Inch (2 to 5 cm), To Measure Inside Dimensions

 (3)  
Micrometer - 1 to 2 Inch (2 to 5 cm), To Measure Outside Dimensions

 (4)  
Caliper - Vernier

 B.  
References

 (1)  
27-51-01/401, Inboard Flap

 (2)  
27-51-03/401, Inboard Aftflap

 C.  
Access

 (1)  
Location Zone
 577 Inboard Flap and Midflap, LH
 677 Inboard Flap and Midflap, RH

 D.  
Procedure

 S 026-002
 (1)  
Remove the inboard flap (Ref 27-51-01/401).

 S 016-003

 (2)  
Remove the aftflap from the midflap (Ref 27-51-03/401).

 S 226-004

 (3)  
Examine the parts that connect the flaps and the foreflap tracks and rollers for worn areas:

 (a)  
Remove the parts.

 (b)  
Measure the parts.

 NOTE: Use a micrometer or a vernier caliper to measure the
____
 parts.

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 27-51-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (c) (d) (e)  Compare the dimensions that were measured to the permitted dimensions shown in Fig. 601.Replace the parts which are out of tolerance.Install the parts.
 (4)  S 416-005Install the inboard aftflap on the inboard midflap (Ref 27-51-03/401).
 (5)  S 426-006Install the inboard flap (Ref 27-51-01/401).
　
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