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(2) Supply system B hydraulic power, do this task: Hydraulic System A or B Pressurization,
TASK 29-11-00-860-801.
SUBTASK 27-51-02-860-003
(3) 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.
D. Trailing Edge Flap Bypass Valve Functional Test
SUBTASK 27-51-02-740-001
(1) Do this task: Trailing Edge Flap Asymmetry Skew System BITE Test, TASK 27-51-00-740-802.
SUBTASK 27-51-02-720-001
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
FLAPS AND FLAP DRIVE MECHANISMS. THE FLAPS CAN CAUSE INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT.
(2) Do a test of the operational speed of the trailing edge flaps:
(a) Move the flap control lever to the UP position and wait for the flaps to reach the UP position.
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(b) Measure the time it takes for the trailing edge flaps to extend from the UP position to the 1-
unit position:
1) Move the flap control lever to the 1-unit position to extend the flaps.
2) Make sure the time it takes for the flaps to extend to the 1-unit position is 11 to 14
seconds.
NOTE: If you will use the system B EMDP only, the extension time will be 34 to 39
seconds.
(c) Measure the time it takes for the trailing edge flaps to retract from the 1-unit position to the
UP position:
1) Move the flap control lever to the UP position to retract the flaps.
2) Make sure the time it takes for the flaps to retract to the UP position is 11 to 14 seconds.
NOTE: If you will use the system B EMDP only, the retraction time will be 34 to 39
seconds.
SUBTASK 27-51-02-720-002
(3) Do a test of the operation of the bypass valve while the trailing edge flaps are moving:
NOTE: It is necessary to do the following two steps within approximately 10 seconds. The flaps
must still be extending when you do the second step.
(a) Move the flap control lever to the 1-unit position.
(b) While the trailing edge flaps are extending, move the ALTERNATE FLAPS ARM switch to
the ARM position.
(c) Make sure the flaps stop extending when you move the ARM switch.
SUBTASK 27-51-02-720-003
(4) Move the flap control lever to the UP position.
(a) Make sure the flaps do not move.
SUBTASK 27-51-02-720-004
(5) Put the ALTERNATE FLAPS ARM switch in the OFF position.
(a) Make sure the flaps retract to the retracted position.
E. Put the Airplane Back to Its Usual Condition
SUBTASK 27-51-02-860-004
(1) Remove system B hydraulic power, do this task: Hydraulic System A or B Power Removal,
TASK 29-11-00-860-805.
------------------------- END OF TASK ---------------------------
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Trailing Edge Flap Bypass Valve Test
Figure 501/27-51-02-990-801
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FLAP PRIORITY VALVE - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) A removal of the flap priority valve
(2) An installation of the flap priority valve
TASK 27-51-04-000-801
2. Flap Priority Valve Removal
(Figure 401)
A. References
Reference Title
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. Tools/Equipment
Reference Description
STD-1054 Container - Fuel Resistant, 5 Gallon (19 Liters)
C. Location Zones
Zone Area
134 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Right
D. Prepare for the Removal
SUBTASK 27-51-04-480-001
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.
(1) 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 27-51-04-860-001
(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
　
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