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Aileron Freeplay Check
Figure 601/27-09-91-990-801
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-09-91
Page 603
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
TASK 27-09-91-200-806
3. Aileron Balance Tab Freeplay - Inspection
A. References
Reference Title
27-11-21-200-801 Aileron Balance Tab Inspection (P/B 601)
27-11-34-200-801 Aileron Tab Control Rods Inspection (P/B 601)
29-11-00-860-801 Hydraulic System A or B Pressurization (P/B 201)
29-11-00-860-805 Hydraulic System A or B Power Removal (P/B 201)
B. Tools/Equipment
Reference Description
STD-753 Scale - Push/Pull, 0-25 pound (0-11 kilogram) Capacity, 1/4 pound
(113 gram) Accuracy
STD-1107 Gauge - Feeler, 0.0 - 0.5 Inch, Readable to 1/1000th
STD-1238 Indicator - Dial
STD-1279 Mount - Device, Mounting, Holds the Dial Indicator
STD-1303 Caliper - Dial
C. Location Zones
Zone Area
572 Left Wing - Aileron
672 Right Wing - Aileron
D. Prepare for the Check
SUBTASK 27-09-91-863-001
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM THE FLIGHT CONTROL SURFACES.
THE AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, STABILIZER AND
NOSE GEAR CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) To pressurize hydraulic systems A and B, do this task: Hydraulic System A or B
Pressurization, TASK 29-11-00-860-801.
E. Do a Check of the Aileron Balance Tab Freeplay
SUBTASK 27-09-91-220-021
(1) Do a freeplay check of one aileron balance tab with no movement of the aileron (Figure 601):
NOTE: Make sure that the aileron does not move while you perform this freeplay check of the
balance tab. If the aileron moves, the reading on the indicator will not be accurate.
(a) Make sure the control wheel is at the center.
(b) Attach the mount, STD-1279, and dial indicator, STD-1238, to the top wing structure
(Figure 601).
(c) Put the plunger of the dial indicator, STD-1238, approximately 0.1 inch (3 millimeters)
forward of the trailing edge of the aileron balance tab directly at the tab control rod.
1) Adjust the dial indicator, STD-1238 to zero.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-09-91
Page 604
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
CAUTION: PUT SUFFICIENT PADDING BETWEEN THE FORCE SCALE, AND THE CONTROL
SURFACE TO PREVENT DAMAGE TO THE CONTROL SURFACE. THE FORCE
SCALE CAN CAUSE DAMAGE TO THE CONTROL SURFACE.
(d) With the push/pull scale 0-25 pound (0-11 kilogram), STD-753, push up with a force of
approximately 5 pounds (22 newtons) (Figure 601).
NOTE: Apply the force 0.25 inch (6.4 millimeters) from the trailing edge of the aileron
balance tab, directly under the plunger of the dial indicator, STD-1238.
1) Make a record of the travel shown on the dial indicator, STD-1238.
2) Slowly remove the force.
(e) Do not adjust the dial indicator, STD-1238.
CAUTION: PUT SUFFICIENT PADDING BETWEEN THE FORCE SCALE, AND THE CONTROL
SURFACE TO PREVENT DAMAGE TO THE CONTROL SURFACE. THE FORCE
SCALE CAN CAUSE DAMAGE TO THE CONTROL SURFACE.
(f) Push down with a force of approximately 5 pounds (22 newtons). (Figure 601).
NOTE: Apply the force 0.25 inch (6.4 millimeters) from the trailing edge of the aileron
balance tab, 0.5 inch (13 millimeters) or less from the plunger of the dial indicator,
STD-1238
1) Make a record of the travel shown on the dial indicator, STD-1238.
2) Slowly remove the force.
(g) Add the up and down freeplay of the aileron balance tab to get the total up and down
freeplay of the aileron balance tab.
1) Make sure the total up and down freeplay of the aileron balance tab is not more than
0.060 inch (1.52 millimeters).
(h) Remove the dial indicator, STD-1238.
(i) Remove the mount, STD-1279.
(j) Do these steps to make sure the axial play (inboard-outboard direction) of the aileron
balance tab is not more than 0.040 inch (1.02 millimeter).
1) Hold the aileron balance tab around the trailing edge and with hand pressure, move it
outboard.
2) Use a 0.0 - 0.5 Inch feeler gauge, STD-1107 or a dial caliper, STD-1303 to measure the
clearance between the aileron and the outboard end of the aileron balance tab.
a) Make a record of this clearance.
3) Hold the aileron balance tab around the trailing edge and with hand pressure, move it
inboard.
4) Measure the clearance between the aileron and the outboard end of the aileron
balance tab.
a) Make a record of the clearance dimension.
　
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