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NOTE: The flap retraction is controlled by a limit switch.
(f) Make sure the pointers on the flap position indicator are in the UP white band.
(g) Release the ALTERNATE FLAPS CONTROL switch to let it move to the OFF position.
(h) Move the ALTERNATE FLAPS CONTROL switch to the DOWN position and hold it until the
trailing edge flaps are in the 40-unit position.
NOTE: Look at the flap position indicators to find the position of the flaps.
(i) Move the ALTERNATE FLAPS ARM switch to the OFF position.
SUBTASK 27-51-00-710-004
(3) Move the flap control lever to the UP position and wait for the flaps to reach the UP position.
(a) Make sure the pointers on the flap position indicator are in the UP white band.
F. Put the Airplane Back to Its Usual Condition
SUBTASK 27-51-00-860-020
(1) Remove system B hydraulic power, do this task: Hydraulic System A or B Power Removal,
TASK 29-11-00-860-805.
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Trailing Edge Flap System Controls
Figure 501 (Sheet 1 of 3)/27-51-00-990-804
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Trailing Edge Flap System Controls
Figure 501 (Sheet 2 of 3)/27-51-00-990-804
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Trailing Edge Flap System Controls
Figure 501 (Sheet 3 of 3)/27-51-00-990-804
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TASK 27-51-00-820-801
3. Trailing Edge Flap Control System Adjustment
(Figure 502)
A. General
(1) This task does an adjustment of the trailing edge flap control system.
(a) The trailing edge flap control system includes the flap control lever, the flap control unit, the
flap control valve, the control cables WFA and WFB, and the follow-up cables WFFA and
WFFB.
(2) When you retract the trailing edge flaps with hydraulic power, it is necessary to stop for two
minutes after you move the flaps. The flaps can move a small distance for 2 minutes after
extension or retraction.
(3) The adjustment instructions included in this task are included in the Flap Actuation Rigging
Instructions drawing 256A3001.
B. References
Reference Title
24-22-00-860-811 Supply Electrical Power (P/B 201)
27-51-00-040-801 Trailing Edge Flap System Deactivation (P/B 201)
27-51-00-860-801 Trailing Edge Flap System Operation With Primary Control (P/B 201)
27-58-01-000-801 Flap Position Transmitter Removal (P/B 401)
27-58-01-400-801 Flap Position Transmitter Installation (P/B 401)
29-11-00-860-801 Hydraulic System A or B Pressurization (P/B 201)
29-11-00-860-805 Hydraulic System A or B Power Removal (P/B 201)
32-00-01-480-801 Landing Gear Downlock Pins Installation (P/B 201)
53-21-00-000-801 Passenger Cabin Floor Panel Removal (P/B 401)
53-21-00-400-801 Passenger Cabin Floor Panel Installation (P/B 401)
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-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. Consumable Materials
Reference Description Specification
C00913 Compound - Nondrying Resin Mix Corrosion
Inhibiting Material
BMS3-27
D00633 Grease - Aircraft General Purpose BMS3-33
E. Expendables/Parts
AMM Item Description AIPC Reference AIPC Effectivity
2 Clip 27-51-00-21-005 GUN 001-099, 155-157,
201-999
27-51-00-24-005 GUN 101-122
8 Clip 27-51-00-21-010 GUN 001-099, 155-157,
201-999
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