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(h) Push the down arrow to find the L FL POS and R FL POS indications.
(i) Make sure that the L FL POS and R FL POS indications are in the limit of 259.9 to 270.3.
(j) Push the ON/OFF button on the front panel of the FSEU to turn the front panel display off.
SUBTASK 27-51-63-710-010
(9) Move the ALTERNATE FLAPS ARM switch to the OFF position.
SUBTASK 27-51-63-860-025
(10) Move the flap control lever to the UP position to retract the flaps.
SUBTASK 27-51-63-860-026
(11) Remove system B hydraulic power, do this task: Hydraulic System A or B Power Removal,
TASK 29-11-00-860-805.
SUBTASK 27-51-63-940-002
(12) Close this access panel:
Number Name/Location
117A Electronic Equipment Access Door
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EFFECTIVITY
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TRAILING EDGE FLAP CONTROL VALVE - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) A removal of the trailing edge flap control valve
(2) An installation of the trailing edge flap control valve
(3) A removal of the flap load limiter solenoid valve
(4) An installation of the flap load limiter solenoid valve.
B. The trailing edge flap control valve is installed on the flap control unit in the main wheel well.
TASK 27-51-65-000-801
2. Trailing Edge Flap Control Valve Removal
(Figure 401)
A. References
Reference Title
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)
B. Location Zones
Zone Area
134 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Right
C. Prepare for the Removal
SUBTASK 27-51-65-860-001
(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.
SUBTASK 27-51-65-860-002
(2) 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.
SUBTASK 27-51-65-480-004
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.
(3) 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.
D. Trailing Edge Flap Control Valve Removal
SUBTASK 27-51-65-860-003
(1) Open this circuit breaker and install safety tag:
F/O Electrical System Panel, P6-2
Row Col Number Name
A 6 C00566 FLIGHT CONTROL FLAP LOAD RELIEF
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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SUBTASK 27-51-65-010-001
(2) Remove the lower pan [11] from the flap control unit [1]:
(a) Remove the screws [10] and washers [23] that attach the lower pan [11] to the flap control
unit [1].
(b) Remove the lower pan [11] from the flap control unit [1].
SUBTASK 27-51-65-480-001
(3) Install the rig pin [14] through the cam follower arm [13] and the valve cam [12]:
SUBTASK 27-51-65-020-001
(4) Remove the flap control valve assembly [6]:
(a) Disconnect the four hydraulic lines [2] from the flap control valve assembly [6].
1) Install caps on the hydraulic lines [2].
2) Install plugs in the hydraulic ports of the flap control valve assembly [6].
(b) Disconnect the electrical connector [3] from the flap control valve assembly [6].
(c) Disconnect the flap control valve assembly [6] from the cam follower arm [13]:
1) Remove the plug [9] from the forward side of the flap control unit [1].
2) Remove the bolt [15], washers [16], bushings [17] and nut [18] that attach the flap
control valve assembly [6] to the cam follower arm [13].
(d) Remove the bolts [7] and washers [8] that attach the flap control valve assembly [6] to the
flap control unit [1].
(e) Remove the flap control valve assembly [6] from the flap control unit [1].
SUBTASK 27-51-65-020-002
(5) If you will install a new flap control valve assembly [6], remove the unions [5] and packings [4].
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