SHEAR RIVET (3 LOCATIONS)  RIG BEAM  A  WS2A CABLE  WS1A CABLE  TURNBUCKLE (EXAMPLE)  WS2B CABLE  WS1B CABLE 
Spoiler Differential Mechanism Quadrant Installation Figure 201 (Sheet 1) 

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A
747-400 MAINTENANCE MANUAL
SPOILERS NO. 1 AND 12

`F (C`) TEMPERATURE  CABLE RIG LOAD - SPOILER SYSTEM 2TENSION 
1  POUNDS (+10/-0)  kg (+4.5/-0) 

(43)110  118  53 
(32)90  109  49 
(21)70  100  45 
(10)50  92  42 
(-1)30  84  38 
10 (-12)  75  34 
-10 (-23)  67  30 
-30 (-34)  59  27 
-40 (-40)  53  24 

THE SYSTEM MUST BE ADJUSTED WHEN THE
CABLE TENSION, LET THE AMBIENT TEMPERATURE CABLE LOADS ARE MORE THAN |15 LBS (|7 kg)
OF THE AIRFRAME STAY CONSTANT |5`F (|3`C) FROM THE TABLE VALUES.
FOR A MINIMUM OF 1 HOUR.

Spoiler Differential Mechanism Quadrant Installation
Figure 201 (Sheet 2)

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A
747-400 MAINTENANCE MANUAL
NUT, WASHER AND RIG BEAM

DIFFERENTIAL MECHANISM
A-A
2. RIG BEAM/ BEARING

B-B

Spoiler Differential Mechanism Quadrant Installation
Figure 201 (Sheet 3)

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747-400 MAINTENANCE MANUAL
DESIGN LIMITS WEAR LIMITS

PERMITTED MAXIMUMDIAMETER
INDEX
WEAR DIAMETER
PART NAME DIM.
NO.
MINIMUM MAXIMUM DIMENSION CLEARANCE INCHES INCHES INCHES INCHES (mm) (mm) (mm) (mm)
1
BEARING
 ID
 0.7495
 0.7500
 0.7500
 
(19.037)
 (19.050)
 (19.050)
 
SHAFT
 OD
 0.7486
 0.7489
 0.7450
 
(19.014)
 (19.022)
 (18.923)
 
RIG BEAM
 ID
 1.6238
 0.6243
 1.6275
 
(41.246)
 (41.257)
 (41.339)
 
BEARING
 OD
 1.6245
 1.6250
 1.6245
 
(41.262)
 (41.275)
 (41.262)
 
ASSEMBLY
QUADRANT
 ID
 0.2500
(6.350)
 0.2505
(6.363)
 
BUSHING
 OD
 0.2508
 0.2513
 
(6.370)
 (6.383)
 
ID
 
SPLINE
 OD
 

0.0050

(0.127)
0.0030
2
(0.076)
3
0.0003 (0.0076)
4

REPLACE WORN PART  REPAIR WORN PART  REPAIR INSTR 
X 
X  X  3 
X  X  3 
X 

THE WORN PART IS REPAIRABLE. REFER TO THE OVERHAUL MANUAL FOR REPAIR INFORMATION.
REPAIR THE WORN OR DAMAGED PARTS OF THE SPLINE. DISCARD THE PART IF MORE THAN 15 PERCENT OF THE TOTAL SPLINE AREA IS DAMAGED.
Spoiler Differential Mechanism Quadrant Installation
Figure 201 (Sheet 4)

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