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removed or installed. This procedure covers the PDU removal with the hydraulic and electric
motors installed.
B. References
Reference Title
27-51-00-040-801 Trailing Edge Flap System Deactivation (P/B 201)
27-51-00-860-804 Retract the Trailing Edge Flaps (P/B 201)
29-09-00-860-802 Hydraulic Reservoirs Depressurization (P/B 201)
29-11-01-860-802 Hydraulic Reservoirs Depressurization (P/B 201)
32-00-01-480-801 Landing Gear Downlock Pins Installation (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-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-1726 Clamp Set - Trailing Edge Flap Torque Tube
(Part #: C27022-1, Supplier: 81205, A/P Effectivity: 737-600, -700,
-700C, -700ER, -700QC, -800, -900, -900ER, -BBJ)
D. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Left
134 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Right
E. Prepare for the Removal
SUBTASK 27-51-51-860-001
(1) If the trailing edge flaps are not in the retracted position, do this task: Retract the Trailing Edge
Flaps, TASK 27-51-00-860-804.
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SUBTASK 27-51-51-480-003
WARNING: MAKE SURE THE DOWNLOCK PINS ARE INSTALLED ON ALL THE LANDING GEAR.
WITHOUT THE DOWNLOCK PINS, THE LANDING GEAR CAN RETRACT AND CAUSE
INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(2) If the downlock pins are not installed in the nose and main landing gear, do this task: Landing
Gear Downlock Pins Installation, TASK 32-00-01-480-801.
SUBTASK 27-51-51-040-001
(3) Do this task: Trailing Edge Flap System Deactivation, TASK 27-51-00-040-801.
SUBTASK 27-51-51-860-002
(4) Remove the pressure from the system B hydraulic reservoir. To remove the pressure, do this
task: Hydraulic Reservoirs Depressurization, TASK 29-11-01-860-802 or Hydraulic
Reservoirs Depressurization, TASK 29-09-00-860-802.
F. Flap Power Drive Unit Removal
SUBTASK 27-51-51-860-003
(1) Open this circuit breaker and install safety tag:
F/O Electrical System Panel, P6-2
Row Col Number Name
D 13 C00841 FLIGHT CONTROL ALTN T.E. FLAP DRIVE
SUBTASK 27-51-51-020-001
(2) Disconnect the electrical connector [18] from the electric motor [19].
SUBTASK 27-51-51-020-002
(3) Disconnect the three hydraulic lines [1] and the case drain line [20] from the hydraulic motor
[22]:
(a) Disconnect the hydraulic lines [1].
(b) Install caps on the hydraulic lines [1].
(c) Disconnect the case drain line [20].
(d) Install a cap on the case drain line [20].
(e) Install plugs in the ports on the hydraulic motor [22].
SUBTASK 27-51-51-020-003
(4) Remove the nut [17], washers [16] and screw [15] that attach the jumper wire [13] to the electric
motor [18].
SUBTASK 27-51-51-010-001
(5) Remove the lower pan [25] from the flap control unit [23]:
(a) Remove the screws [24] that attach the lower pan [25] to the flap control unit [23].
(b) Remove the lower pan [25].
SUBTASK 27-51-51-480-001
(6) Install the rig pin kit, SPL-1585, flap actuator rig pin, through the cam follower arm [27] and the
valve cam [26].
SUBTASK 27-51-51-480-002
(7) Install the clamp set, SPL-1726 on the torque tubes [12] on both sides of the power drive unit [21].
SUBTASK 27-51-51-020-004
(8) Disconnect the torque tubes [12] from the power drive unit [21]:
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(a) Remove the screws [35] that attach the coupling sleeves [36] to the splined couplings [37]
on the torque tubes [12].
(b) Move the coupling sleeves [36] off the splined couplings [37].
SUBTASK 27-51-51-020-005
(9) Disconnect the cables [6] from the cables [2] on the flap control unit [23]:
NOTE: The lower cables are WFFA and the upper cables are WFFB.
(a) Install a label on the cables [2] to identify them.
(b) Remove the clips [3] from the turnbuckles [4].
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737-600-700-800-900 飞机维护手册5 AIRCRAFT MAINTENANCE MANUA(73)
