Subtask 27-64-51-790-051
G. Leak Test
(1) Examine the servo control filter (2) for leaks. R WARNING : CUT, REMOVE AND DISCARD THE LOCKWIRE AS YOU DO THE TASK.
_______ R LOOSE LOCKWIRE CAN CUT OR BLIND YOU.
(2) Safety the filter with MISCELLANEOUS (Material No. 19-010).
Subtask 27-64-51-866-060
H. Retract the Spoiler
(1)
Retract the applicable spoiler (Ref. TASK 27-60-00-866-002).
(2)
On the servo-control, turn the SPOILER MAINTENANCE KEY (98D27603002000) or the SPOILER MAINTENANCE KEY (98D27603002001) in the maintenance device to the operation position and then remove it.
Subtask 27-64-51-710-052
J. Test
(1) Do an operational test of the spoiler hydraulic actuation (Ref. TASK 27-64-00-710-001).
5. Close-up
________
Subtask 27-64-51-942-053
A. Removal of Equipment
(1)
Remove the safety barriers.
(2)
Make sure that the work area is clean and clear of tool(s) and other items.
(3)
Remove the warning notice(s).
(4)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
SERVO CONTROL - SPOILER (32CE1,32CE2,32CE3,32CE4) - REMOVAL/INSTALLATION
________________________________________________________________________
Spoilers 4 and 5 Servo-Control - Location Detail Figure 401/TASK 27-64-52-991-010-A12 (SHEET 1)
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Spoilers 4 and 5 Servo-Control - Location Detail Figure 401/TASK 27-64-52-991-010-A22 (SHEET 2)
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___________________________________________________
1. General
_______
R A. System Configuration
The aircraft has five slats on the leading edge of each wing. Together with the flaps (Ref. 27-50-00) they are used to increase lift. The slats are installed on tracks which are attached to the leading edge of each wing.
The slats are attached, at the forward end, to circular-arc tracks. The
tracks operate in guide rollers. Two tracks support each of the four
R slats outboard of the engine pylon. Four tracks support the slat inboard
R of the engine pylon. Two of the tracks inboard, and each of the tracks outboard of the engine pylon, have curved rack gears fitted.
Each curved rack gear engages with a pinion. Plug-in rotary actuators move the pinions. Power to the plug-in rotary actuators comes from the transmission. An electrically controlled hydro-mechanical Power Control Unit (PCU) gives power to move the transmission.
Two Slat/Flap Control Computers (SFCC1 and SFCC2) monitor and control the slats. An Instrumentation Position Pick-Off Unit (IPPU) is installed on the Power Control Unit (PCU). It sends signals to the Electronic Instrument System (EIS), which identifies the position of the slats. A Feedback Position Pick-Off Unit (FPPU) gives signals of the output shaft position of the PCU. Two Asymmetry Position Pick-Off Units (APPU) give signals of the slat position or speed. The SFCC1 and the SFCC2 receive and monitor the signals from the FPPU and the APPUs.
2. Component Location
__________________
(Ref. Fig. 001)
3. System Description
__________________
(Ref. Fig. 002)
A. Electrical Control and Monitoring (Ref. 27-81-00)
The electrical control and monitoring system of the slats has:
-
a slat/flap control lever
-
a Command Sensor Unit (CSU)
-
two Slat/Flap Control Computers (SFCC)
-
two electrically controlled valve blocks which are installed on the slat Power Control Unit (PCU)
Slats - Component Location
Figure 001
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Slat Control - Schematic
Figure 002
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-a Feedback Position Pick-off-Unit (FPPU)
-
two Asymmetry Position Pick-off-Units (APPU)
-
two Wing Tip Brakes (WTB).
The slat and flap control lever controls the position of the slats. The Command Sensor Unit (CSU) identifies the position of the slat and flap control lever and sends related signals to each SFCC. Each SFCC controls the valve block of a hydraulic motor, which is part of the slat PCU.
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