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the rudder hinge or power control units.
(g) Use a block, STD-1278 and push/pull scale 0-25 pound (0-11 kilogram), STD-753 to move the
rudder to the left side with a force of 12.0 +/- 4.0 pounds (53 +/- 17 newtons) and release
slowly.
NOTE: Apply the force approximately 6-8 inches (150-200 millimeters) from the bottom of
the trailing edge and 3 inches (80 millimeters) forward of the trailing edge.
1) Make a record of the rudder position on the dial indicator, STD-1238.
(h) Make sure the difference between the two left positions is not more than 0.03 inch (0.7
millimeter).
(i) Remove the dial indicator, STD-1238 from the rudder.
SUBTASK 27-09-91-860-004
(3) Do this task: Put the Rudder Hydraulic systems A, B, and Standby Back to the Condition
Before the Pressurization, TASK 27-21-00-840-801.
------------------------- END OF TASK ---------------------------
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Rudder Hinge and PCU Bearing Freeplay Check
Figure 603/27-09-91-990-802
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TASK 27-09-91-200-804
5. Horizontal Stabilizer - Inspection
Figure 604
A. General
(1) This task is to calculate the freeplay of the horizontal stabilizer. The freeplay of the horizontal
stabilizer is the total of the freeplay of the stabilizer jackscrew and the hinge mechanism.
(2) In this task, you can use two persons at 220 +/- 25 pounds (100 +/- 11 kilograms) each for
applying the force, W, on the stabilizer. Measure and record the weight of each person and the
total weight of the two persons. The difference between the two persons should be not more than
10 pounds (5 kilograms). Alternatively, you can use two weights, such as bars or shot.
NOTE: When recording the weights during this freeplay measurement task, the weights should
be recorded in pounds and not in kilograms. When recording dial indicator
measurements, inches should be recorded and not millimeters. The calculations for
freeplay, X, Y, and Z use multipliers that are calculated using pounds and inches, not
kilograms and millimeters. Using metric equivalents in the equations that determine
freeplay values X, Y, and Z will cause the calculated freeplay values to be in error.
B. References
Reference Title
27-41-81-000-801 Stabilizer Ball Nut and Jackscrew Gearbox Removal (P/B 401)
C. Tools/Equipment
Reference Description
STD-1238 Indicator - Dial
STD-1279 Mount - Device, Mounting, Holds the Dial Indicator
D. Location Zones
Zone Area
311 Area Aft of Pressure Bulkhead - Left
312 Area Aft of Pressure Bulkhead - Right
330 Subzone - Left Horizontal Stabilizer and Elevator
340 Subzone - Right Horizontal Stabilizer and Elevator
E. Access Panels
Number Name/Location
311BL Stabilizer Trim Access Door
F. Prepare for the Check
SUBTASK 27-09-91-010-002
(1) On the stabilizer trim actuator, do this task:
Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
SUBTASK 27-09-91-480-001
(2) Set the stabilizer to 4 units of trim.
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G. Horizontal Stabilizer Inspection
SUBTASK 27-09-91-220-008
(1) Do a check of the freeplay for the hinge bearing of the stabilizer center section (Figure 604):
(a) Measure the freeplay of the left hinge bearing (X):
1) Attach an dial indicator, STD-1238 with a mount, STD-1279 to the left side of the fuselage
at the rear spar connector of the stabilizer.
a) Make sure that the plunger of the dial indicator, STD-1238 pushes against the
stabilizer lower surface at a minimum dial travel of 0.13 inch (3.2 millimeters).
2) Use the weight to slowly apply a force, ‘‘W’’, of 440 +/- 50 pounds (200 +/- 23
kilograms) to the outboard end of the left stabilizer above the front spar.
NOTE: When recording the weights during this freeplay measurement task, the
weights should be recorded in pounds and not in kilograms. The calculation
for freeplay, X, uses a multiplier that is calculated using pounds for a weight
measurement, not kilograms. Using metric equivalents in the equation that
determines the freeplay value X, will cause the calculated freeplay value to be
　
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