(a)
P7, Overhead Circuit Breaker Panel
1) 7G6, SPEED BRAKE AUTO CONT
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747-400 MAINTENANCE MANUAL
GROUND SPOILERS - INSPECTION/CHECK
__________________________________
1. General_______
A. There is one task in this procedure; an inspection of the ground spoilers. To do the inspection, you measure the inner and outer diameters of the parts in the hinges and the control package connection. The parts include bushings, bearings, liners, and bolts.
B. To do the check, you must remove the ground spoiler from the airplane and disassemble the hinges and the control package connection. You usually do this procedure before you install a ground spoiler.
TASK 27-62-01-206-001
2. Ground Spoiler Inspection_________________________
A. Standard Tools and Equipment
(1)
Micrometer - 0 to 1 inch (0-25mm)
(2)
Micrometer - 1 to 2 inch (25-50mm)
(3)
Vernier Caliper
B.
References
(1)
27-62-01/401, Ground Spoilers
C.
Access
(1)
Location Zone
574 Spoiler No. 6
674 Spoiler No. 7
D.
Procedure
S 026-002
(1)
Do this task: "Ground Spoiler Removal" (Ref 27-62-01/401).
S 226-003
(2)
Examine the parts for worn areas:
(a)
Remove the parts.
(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)
Repair or replace the parts that are not in the tolerance.
(e)
Install the parts.
(3)
Do this task: "Ground Spoiler Installation" (Ref 27-62-01/401).
S 426-004
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747-400
MAINTENANCE MANUAL
SEE A
GROUND SPOILER
ADJUSTABLE
SEAL
SEE B
SEE C
SEE D
SEE B
SEE E
TRAILING EDGE
FWD INBD BEAM
EXAMPLE OF GROUND SPOILERS NO. 6 AND 7 A
Ground Spoiler Wear Limits
Figure 601 (Sheet 1)
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747-400 MAINTENANCE MANUAL
GROUND SPOILER
INBD
Ground Spoiler Wear Limits
Figure 601 (Sheet 2)
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747-400 MAINTENANCE MANUAL
DESIGN LIMITS WEAR LIMITS
PERMITTED MAXIMUM
DIAMETER
INDEX
WEAR DIAMETER
PART NAME DIM.
NO. MINIMUM MAXIMUM DIMENSION CLEARANCE INCHES INCHES INCHES INCHES (mm) (mm) (mm) (mm)
1
BEARING ID 0.4993 0.5000 0.5045
(12.682) (12.700) (12.815)
BOLT OD 0.4990 0.4995 0.4950
(12.675) (12.688) (12.573)
BUSHING ID 0.5000 0.5010 0.5045
(12.700) (12.726) (12.815)
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