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"up force").
a) Make a record of this up force.
7) Make sure the difference between the down force and up force is equal or less than 20
pounds (89 newtons).
8) If the difference between the down force and up force is greater than 20 pounds (89
newtons), then do this task: FIM 27-31 TASK 810.
(e) If the right elevator trailing edge stays at the index mark, then do these steps:
1) Hold the captain’s control column in the neutral position.
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL
CONTROL SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER.
AILERONS, RUDDERS, 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.
2) Turn on the A and B hydraulic systems to center the elevator, do this task: Elevator
Hydraulic System A and B - Pressurization, TASK 27-31-00-800-801.
3) Do this task: Remove Pressure from the Elevator Hydraulic Systems A and B,
TASK 27-31-00-800-802.
4) Use the force gauge, COM-1557 to measure the force required to move the elevator
trailing edge down 0.75 +/- 0.15 inch (19.1 +/- 3.8 mm) (1.25 +/- 0.24 degrees) from
the index mark (which is referred to as the "down force").
a) Make a record of this down force.
5) Use the force gauge, COM-1557 to measure the force required to move the elevator
trailing edge up 0.75 +/- 0.15 inch (19.1 +/- 3.8 mm) (1.25 +/- 0.24 degrees) from the
index mark (which is referred to as the "up force").
a) Make a record of this up force.
6) If the down force is less than the up force, then do a check of the elevator balance
adjustment (SRM 51-60-04).
7) Calculate the sum of the down force and the up force.
8) Make sure the sum of the down force and the up force is equal or less than 32 pounds
(142 newtons).
9) If the sum of the down force and the up force is greater than 32 pounds (142 newtons),
then, do this task: FIM 27-31 TASK 810.
H. Put the Airplane Back to Its Usual Condition
SUBTASK 27-31-00-860-050
(1) Do this task: Put the Elevator Systems A and B Back to the Condition Before the Pressure
Removal, TASK 27-31-00-840-802.
737-600/700/800/900
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SUBTASK 27-31-00-410-008
(2) Close this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
------------------------- END OF TASK ---------------------------
TASK 27-31-00-700-803
13. Elevator Balance Panels - Test
(Figure 502, Figure 504)
A. General
(1) Use this test to make sure the elevator balance panels are installed properly. This task is
applicable for the left and right elevator balance panels.
B. References
Reference Title
27-31-00-700-801 Null Procedure - Mach Trim Actuator (P/B 201)
27-31-00-800-802 Remove Pressure from the Elevator Hydraulic Systems A and B
(P/B 201)
27-31-00-840-802 Put the Elevator Systems A and B Back to the Condition Before the
Pressure Removal (P/B 201)
27-31-41-400-801 Elevator Balance Panel - Installation (P/B 401)
C. Location Zones
Zone Area
211 Flight Compartment - Left
212 Flight Compartment - Right
311 Area Aft of Pressure Bulkhead - Left
312 Area Aft of Pressure Bulkhead - Right
334 Left Horizontal Stabilizer - Elevator
344 Right Horizontal Stabilizer - Elevator
D. Access Panels
Number Name/Location
311BL Stabilizer Trim Access Door
E. Prepare for the Test
SUBTASK 27-31-00-860-051
(1) Do this task: Remove Pressure from the Elevator Hydraulic Systems A and B,
TASK 27-31-00-800-802.
SUBTASK 27-31-00-860-052
(2) Do this task: Null Procedure - Mach Trim Actuator, TASK 27-31-00-700-801.
SUBTASK 27-31-00-010-008
(3) Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
737-600/700/800/900
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SUBTASK 27-31-00-860-053
(4) Use the stab trim switches on the control wheel to set the stabilizer at approximately 4 units of
trim.
SUBTASK 27-31-00-860-054
(5) Move the control columns in a longitudinal direction (forward and aft) through full travel one
time.
F. Elevator Balance Panels Test
SUBTASK 27-31-00-200-006
(1) Check to make sure the bulb seal gaps in the balance panel bay are 0.02 +/- 0.01 inches (0.5
　
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