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1) Measure the aft travel of the first officer’s right pedal from the middle position of the
pedal adjustment.
2) Make sure the aft travel, which measured at the pedal pivot point is at a minimum of
6.61 in. (167.9 mm).
3) Release the first officer’s left pedal.
(h) Move the first officer’s right pedal forward until it touches the stop and hold.
1) Measure the aft travel of the first officer’s left pedal from the middle position of the
pedal adjustment.
2) Make sure the aft travel, which measured at the pedal pivot point is at a minimum of
6.61 in. (167.9 mm).
3) Release the first officer’s right pedal.
SUBTASK 27-21-00-860-091-001
(4) 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 ---------------------------
TASK 27-21-00-700-814-001
8. Rudder Hinge Bearing and PCU Bearing Freeplay
(Figure 503)
A. General
(1) Use this task to check the freeplay of the rudder control system.
(2) This test will have two rudder left position readings. This will verify that the indicator does not
move during the test.
B. References
Reference Title
27-21-00-800-801 Rudder Hydraulic System A, B, or Standby Pressurization (P/B 201)
27-21-00-840-801 Put the Rudder Hydraulic systems A, B, and Standby Back to the
Condition Before the Pressurization (P/B 201)
C. Tools/Equipment
Reference Description
STD-753 Scale - Push/Pull, 0-25 pound (0-11 kilogram) Capacity, 1/4 pound
(113 gram) Accuracy
STD-1238 Indicator - Dial
STD-1278 Block - Loading, 1/8 Inch Thick, 3 Inch by 3 Inch Wood or Fiberglass
Block with Pad to Prevent Damage to the Skin.
STD-1279 Mount - Device, Mounting, Holds the Dial Indicator
D. Location Zones
Zone Area
211 Flight Compartment - Left
212 Flight Compartment - Right
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-00
Config 1
Page 536
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
(Continued)
Zone Area
324 Vertical Fin - Rear Spar To Trailing Edge
E. Procedure
SUBTASK 27-21-00-860-092-001
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDER,
ELEVATORS, FLAPS, SPOILERS, SLATS, AND THRUST REVERSERS CAN MOVE
QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO
PERSONS AND DAMAGE TO EQUIPMENT.
(1) Pressurize the rudder hydraulic systems A and B. To pressurize them, do this task: Rudder
Hydraulic System A, B, or Standby Pressurization, TASK 27-21-00-800-801.
SUBTASK 27-21-00-730-017-001
(2) Do the rudder hinge bearing and PCU bearing freeplay:
(a) Make sure the rudder and rudder pedals are in the neutral position.
(b) Make sure the rudder trim indicator is at zero units of trim.
(c) Attach the dial dial indicator, STD-1238 with the mount, STD-1279 at the lower end of the
rudder trailing edge.
CAUTION: USE A LOADING BLOCK AND DO NOT PUT MORE THAN 50 LBF (222 N) ON THE
RUDDER WHEN YOU MOVE THE RUDDER SURFACE BY AN EXTERNAL FORCE.
APPLY THE EXTERNAL FORCE APPROXIMATELY BETWEEN 6 TO 8 INCHES (150
TO 200 MILLIMETERS) FROM THE BOTTOM OF THE TRAILING EDGE AND
APPROXIMATELY 3 INCHES (80 MILLIMETERS) FORWARD OF THE TRAILING
EDGE. IF YOU DO NOT APPLY FORCE AT THIS LOCATION, YOU CAN CAUSE
DAMAGE TO THE RUDDER.
(d) 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 lbf (53.4 ±17.8 N) and release slowly.
1) Make a record of the rudder position on the dial indicator.
(e) Use a block, STD-1278 and push/pull scale 0-25 pound (0-11 kilogram), STD-753 to move the
rudder to the right side with a force of 12.0 ±4.0 lbf (53.4 ±17.8 N) and release slowly.
1) Make a record of the rudder position on the dial indicator.
(f) Make sure the difference between the left and right positions is not more than 0.05 in.
(1.3 mm).
1) If the difference is more than 0.05 in. (1.3 mm), then remove and replace the worn parts
of the rudder hinge or power control units and repeat this test.
(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 lbf (53.4 ±17.8 N) and release slowly.
NOTE: This check compares the two left positions to verify that the dial indicator did not
move during the test. If the check shows that the dial indicator had moved, the test
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL飞机维护手册2(33)
