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 1.  General_______
 A.  The outboard flap inspection/check procedures are in this section. The procedures contain the data necessary to do a check of the pivot points of the aftflap arms in the midflap. The check measures the inner and outer diameters of the bushings and sleeves which connect the midflap and the aftflap.
 B.  To do the check, the outboard aftflap must be removed from the airplane. The check is usually done before the outboard flap is installed.
 C.  This data consists of illustrations and wear limit charts. For steps required to gain access to the component, to remove it, or to replace it after inspection for wear, refer to Outboard Flap - Removal/Installation (AMM 27-51-04/401).
 TASK 27-51-04-206-001
 2.  Outboard Flaps Inspection (Fig. 601)_________________________
 A.  Standard Tools and Equipment
 (1)  
Micrometer - 0 to 1 inch (0 to 3 cm)

 (2)  
Caliper - Vernier

 B.  
References

 (1)  
AMM 27-51-04/401, Outboard Flap

 (2)  
AMM 27-51-05/401, Outboard Foreflap

 (3)  
AMM 27-51-06/401, Outboard Aftflap

 C.  
Access

 (1)  
Location Zone
 586 Outboard Flap Foreflap, LH
 587 Outboard Flap Midflap, LH
 588 Outboard Flap Aftflap, LH
 686 Outboard Flap Foreflap, RH
 687 Outboard Flap Midflap, RH
 688 Outboard Flap Aftflap, RH

 D.  
Procedure

 (1)  
Remove the aftflap (Ref 27-51-06/401).

 S 226-003

 (2)  
Examine the parts that connect the midflap to the aftflap for worn areas:

 (a)  
Remove the parts.

 (b)  
Measure the parts.

 S 026-002
 NOTE: Use a micrometer or a vernier caliper.
____
 (c)  
Compare the dimensions that you measured to the permitted dimensions shown in Fig. 601.

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

 (e)  
Install the parts.

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747-400 MAINTENANCE MANUAL
 S 426-004
 (3) Install the outboard aftflap (Ref 27-51-06/401).
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MAINTENANCE MANUAL

C-C  D-D

Outboard Aftflap Arm Assembly Wear Limits
Figure 601 (Sheet 1)

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1 INDEX NO.  BUSHING PIN PART NAME DIM. ID OD  (cm)(cm) INCHES MINIMUM MAXIMUM INCHES DESIGN LIMITS DIAMETER (2.541)(2.538) (2.538)(2.537) 0.9992 1.00020.9994 0.9987  (cm) PERMITTED DIMENSION INCHES WEAR WEAR LIMITS (2.553) (2.523) 1.0052 0.9934  (cm) MAXIMUM DIAMETER CLEARANCE INCHES (0.015) 0.006  X REPLACE PART WORN X  REPAIR INSTRPART WORN REPAIR 
2  FITTING ARM 2 1  3.933 3.947 3.963 3.945 (10.020)(9.990) (10.066)(10.025)  4.015 3.877 (9.848) (10.198)  (AXIAL) 0.070 (0.118)  X X 
3  BUSHING PIN ID OD  0.8737 0.8744 0.8752 0.8742 (2.220)(2.219) (2.223)(2.221)  0.8684 0.8802 (2.206) (2.236)  (0.015) 0.006  X X 
4  FITTING ARM 2 1  3.743 3.757 3.755 3.773 (9.538)(9.507) (9.583)(9.543)  3.687 3.825 (9.365) (9.716)  0.070 (AXIAL) (0.118)  X X 
5  FITTING ARM 2 1  2.873 2.887 2.885 2.903 (7.328)(7.297) (7.374)(7.333)  2.810 2.955 (7.137) (7.506)  0.070 (AXIAL) (0.118)  X X 
　
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