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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) Measure the force necessary to move the flap control lever to the 1-unit position:
(a) Move the flap control lever out of the UP detent.
(b) Put a force gauge, COM-1557 on the end of the flap control lever.
(c) Use the force gauge, COM-1557 to move the flap control lever to the 1-unit position.
NOTE: Make sure the force gauge, COM-1557 is perpendicular to the flap control lever
when you measure the force.
(d) Make sure the force necessary to move the flap control lever is less than 5 pounds (22
newtons).
SUBTASK 27-51-00-720-010
(3) Use the force gauge, COM-1557 to measure the force necessary to move the flap control lever to
the 40-unit position with a stop at each detent.
(a) Make sure the force necessary to move the flap control lever is less than 5 pounds (22
newtons).
SUBTASK 27-51-00-720-011
(4) Use the force gauge, COM-1557 to measure the force necessary to move the flap control lever to
the UP position with a stop at each detent.
(a) Make sure the force necessary to move the flap control lever is less than 5 pounds (22
newtons).
SUBTASK 27-51-00-080-002
(5) Remove the force gauge, COM-1557 from the end of the flap control lever.
G. Put the Airplane Back to Its Usual Condition
SUBTASK 27-51-00-860-048
(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 ---------------------------
TASK 27-51-00-720-803
11. Alternate Flap Control System Functional Test
(Figure 501)
A. General
(1) During the functional test, you make sure the alternate operation of the trailing edge flaps is
satisfactory.
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B. References
Reference Title
24-22-00-860-811 Supply Electrical Power (P/B 201)
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)
C. Tools/Equipment
Reference Description
STD-1139 Timer - Stop Watch, Accurate to 1 Second
D. Location Zones
Zone Area
211 Flight Compartment - Left
212 Flight Compartment - Right
E. Prepare for the Functional Test
SUBTASK 27-51-00-860-049
(1) Do this task: Supply Electrical Power, TASK 24-22-00-860-811.
SUBTASK 27-51-00-860-050
WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE FLIGHT CONTROL SURFACES, THE
THRUST REVERSERS, AND THE LANDING GEAR. THESE COMPONENTS CAN MOVE
SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT.
(2) Supply system B hydraulic power, do this task: Hydraulic System A or B Pressurization,
TASK 29-11-00-860-801.
F. Procedure
SUBTASK 27-51-00-860-051
(1) Move the ALTERNATE FLAPS ARM switch to the ARM position.
NOTE: The standby hydraulic pump motor will operate when the ALTERNATE FLAPS ARM
switch is in the ARM position.
SUBTASK 27-51-00-860-052
(2) Move the flap control lever to the 40-unit position.
NOTE: This will decrease the load on the flap electric motor.
(a) Make sure the flaps do not extend.
SUBTASK 27-51-00-710-005
CAUTION: WAIT A MINIMUM OF 15 SECONDS AFTER THE FLAPS STOP BEFORE YOU USE THE
ALTERNATE SYSTEM TO MOVE THE FLAPS AGAIN. YOU CAN CAUSE DAMAGE TO
THE FLAP ALTERNATE MOTOR.
(3) Hold the ALTERNATE FLAPS CONTROL switch in the DOWN position until the trailing edge flaps
stop.
NOTE: The leading edge flaps and slats will extend when you move the switch to the DOWN
position. The trailing edge flap extension is controlled by a limit switch.
(a) Make sure the pointers on the flap position indicator are in the 40-unit white band.
(4) Release the ALTERNATE FLAPS CONTROL switch to let it move to the OFF position.
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EFFECTIVITY
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SUBTASK 27-51-00-710-006
(5) Move the ALTERNATE FLAPS CONTROL switch to the UP position until the trailing edge flaps
stop.
NOTE: The flap retraction is controlled by a limit switch.
(a) Make sure the pointers on the flap position indicator are in the UP white band.
SUBTASK 27-51-00-860-084
(6) Move the flap control lever to the UP position.
　
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