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1) Remove the plugs that were installed over the ends of the pitot lines.
2) Remove the highly visible streamer that you installed on the opening of the aft
unpressurized compartment.
(c) Install the restrictor valves on the bottom of the pitot lines.
SUBTASK 27-31-00-410-019
(4) Close this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
SUBTASK 27-31-00-860-093
(5) Do this task: Put the Elevator Hydraulic systems A and B Back to the Condition Before the
Pressurization, TASK 27-31-00-840-801.
------------------------- END OF TASK ---------------------------
TASK 27-31-00-700-814
24. Sensor Null - Test
(Figure 502)
A. General
(1) Use this test to do the elevator rigging test with the DFCS computer BITE. The control display
unit (CDU) is necessary for this procedure.
B. References
Reference Title
27-31-00-800-801 Elevator Hydraulic System A and B - Pressurization (P/B 201)
27-31-00-840-801 Put the Elevator Hydraulic systems A and B Back to the Condition
Before the Pressurization (P/B 201)
C. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
tools shown are alternates to each other within the same airplane series. Tool part numbers
that are replaced or non-procurable are preceded by "Opt:", which stands for Optional.
Reference Description
SPL-1677 Assembly - Trammel Bar, Stabilizer Trim Actuator
(Part #: F80055-1, Supplier: 81205, A/P Effectivity: 737-100, -200,
-200C, -300, -400, -500, -600, -700, -700C, -700ER, -700QC, -800, -900,
-900ER, -BBJ)
D. 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
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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E. Access Panels
Number Name/Location
311BL Stabilizer Trim Access Door
F. Prepare for the Test
SUBTASK 27-31-00-860-096
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.
(1) Pressurize elevator hydraulic systems A and B. To pressurize them, do this task: Elevator
Hydraulic System A and B - Pressurization, TASK 27-31-00-800-801.
SUBTASK 27-31-00-010-022
(2) Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
SUBTASK 27-31-00-860-097
(3) Use the bar, SPL-1677 to set the "B" dimension at 4 units of trim (39.89 +/- 0.01 inches or 1013.2
+/- 0.3 mm) (Figure 502).
G. Sensor Null Test
SUBTASK 27-31-00-740-006
(1) Do the sensor null test:
(a) Do this BITE test on the control display unit (CDU):
1) Push the INIT REF key on the CDU keyboard.
2) Push the Line Select Key (LSK) that is adjacent to these selections:
NOTE: Use the NEXT PAGE or PREV PAGE key to change page if it is necessary.
During the BITE test, if the "CONTINUE" shows, then push the LSK that is
adjacent to "CONTINUE" after you do the instructions that show on the CDU
display.
a) INDEX
b) MAINT
c) DFCS
d) EXTENDED MAINTENANCE
e) RIGGING
f) ELEVATOR
g) CONTINUE
3) Do the instructions that show on the CDU and push the LSK adjacent to these
selections:
a) CONTINUE
b) ELEV RIG
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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4) Make sure the BITE display values on the A and B sides are in the limit as shown
below:
NOTE: During the BITE test, if the "CONTINUE" shows, then push the LSK that is
adjacent to "CONTINUE" after you do the instructions that show on the CDU
display.
Table 509/27-31-00-993-819
Test 51.01 STAB POS (VAC) Limits: -0.07 TO 0.07
Use the bar, F80055-1 to set the "B" dimension as on the CDU. Test 51.02
Test 51.02 MT ACT POS (VAC) Limits: -6.10 to -8.43
　
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