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TASK 27-31-14-000-801
2. Elevator Power Control Unit - Removal
(Figure 401, Figure 402, Figure 403)
A. References
Reference Title
27-31-00-800-802 Remove Pressure from the Elevator Hydraulic Systems A and B
(P/B 201)
B. 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-1585 Kit - Rigging Pins, All Systems
(Part #: F70207-109, Supplier: 81205, A/P Effectivity: 737-600, -700,
-700C, -700ER, -700QC, -800, -900, -900ER, -BBJ)
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)
SPL-1683 Fixture - Elevator Rigging and Restraining
(Part #: F80063-501, Supplier: 81205, A/P Effectivity: 737-100, -200,
-200C, -300, -400, -500, -600, -700, -700C, -700ER, -700QC, -800, -900,
-900ER, -BBJ)
C. Location Zones
Zone Area
311 Area Aft of Pressure Bulkhead - Left
312 Area Aft of Pressure Bulkhead - Right
317 Tail Cone Compartment - Left
318 Tail Cone Compartment - Right
D. Access Panels
Number Name/Location
311BL Stabilizer Trim Access Door
317AL Tail Cone Access Door
318BR Tailcone Access Door
737-600/700/800/900
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E. Prepare for the Removal
SUBTASK 27-31-14-010-001
(1) Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
SUBTASK 27-31-14-860-001
(2) Use the bar, SPL-1677 to set the B dimension at 39.89 +/- 0.01 inches (1013.21 +/- 0.25
millimeters) (Figure 401).
SUBTASK 27-31-14-860-002
(3) Do this task: Remove Pressure from the Elevator Hydraulic Systems A and B,
TASK 27-31-00-800-802.
SUBTASK 27-31-14-010-002
(4) Remove this access panel:
Number Name/Location
318BR Tailcone Access Door
SUBTASK 27-31-14-010-004
(5) Remove this access panel:
Number Name/Location
317AL Tail Cone Access Door
F. Elevator PCU Removal
(Figure 402)
SUBTASK 27-31-14-020-002
(1) Remove the nuts [22], washers [21], washers [20], and bolts [19] to disconnect the four input rods
[23] from the four input cranks [18] (two on each elevator PCU).
NOTE: Move the control column to move the quadrant out of the way when there are clearance
problems with the lower input rod attach bolt.
SUBTASK 27-31-14-020-004
(2) Move the four input cranks [18] forward.
SUBTASK 27-31-14-480-003
(3) Install the rig pin E-5 from the rig pin kit, SPL-1585 in the elevator aft control quadrant
(Figure 402).
NOTE: To easily get access to the lower connection, set the input cranks on the rig pin E-5.
NOTE: If necessary, disconnect the vernier control pushrods [30] and [31] so that the torque
tube can be rotated to gain access to the PCU attach bolt (Fig. 402).
SUBTASK 27-31-14-020-003
(4) Remove the elevator PCU [6]:
(a) Remove the nut [17], washer [16], nut [15], washer [14], bolt [12], and bushing [13] that
attach the elevator PCU [6] to the mounting brackets.
NOTE: If necessary, move the control quadrant to rotate the input cranks out of the way of
the PCU attachment bolt head.
737-600/700/800/900
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WARNING: RELEASE THE HYDRAULIC CONNECTION SLOWLY AND LET THE PRESSURE
DECREASE BEFORE YOU COMPLETELY REMOVE THE HYDRAULIC LINES. IF
YOU DISCONNECT THE HYDRAULIC LINE WHEN IT HAS PRESSURE, A SPRAY OF
HYDRAULIC FLUID CAN CAUSE INJURY TO PERSONS.
(b) Disconnect the hydraulic lines [3] from the elevator PCU [6].
1) Install caps and plugs on the hydraulic lines [3] and ports.
(c) Remove the nut [11], washer [10], washer [9], and bolt [8] that attach the elevator PCU [6] to
the output torque tube [7].
(d) Remove the elevator PCU [6] from the airplane.
SUBTASK 27-31-14-480-002
(5) If you remove the two elevator PCUs at the same time, then install the fixture, SPL-1683 in the
position of the right elevator elevator PCU [6] (Figure 403).
(a) Put the fixture, SPL-1683 between the output torque tube and input crank.
(b) Install the pins of fixture, SPL-1683 to hold the fixture, SPL-1683 in position.
　
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