-
the motor now operates at "Low Speed" because of the decreased size of the pressure and pressure-return connections.
-electrical power is removed from the drive-direction solenoid and the POB solenoid valve when the flaps are 0.177 deg. (FPPU) away from the set position.
-when the LVDT indicates that the valve spool is 1.5 mm from the center position the SFCC removes power from the opposite direction solenoid valve.
-the valve spool moves to the center position and stops.
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PCU Operation - Normal Startup Sequence Figure 012
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PCU Operation - Normal Shutdown Sequence Figure 013
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(d) Pressure Maintaining Function
Emergency or standby hydraulic power has a limited flow capacity. At a time of operation with emergency or standby hydraulic power, it is necessary to prevent a sudden decrease in supply pressure. A sudden decrease in supply pressure can occur because of too much demand by the flap system. This could cause an application of the POB at any time.
The force and the rate of the spring, together with the port area/valve movement property, give the function that maintains the pressure of the valve. As the supply pressure decreases, the valve closes slowly. This reduces the flowrate to the motor and thus the workload on the pump. This prevents the workload of the slat system to cause a sudden decrease of the supply pressure.
(e) Single System Operation
The loss of the hydraulic pressure to one of the two motors causes the POB to apply and hold the motor output shaft. This locks one half of the differential gearbox. The serviceable motor then gives sufficient output torque at half speed, at the gearbox output shaft.
B. Bevel Gearbox, 19 degree (6003CM)
(Ref. Fig. 014)
The bevel gearbox has a ratio of 1:1. The input and output shafts have reversed lip seals which make sure that unwanted material does not get into the gearbox. The gearbox is filled with grease. There are inspection plugs through which you can examine the lubricant.
C. Tee Gearbox (6005CM)
(Ref. Fig. 015)
The T-gearbox has a ratio of 1:1. Bearings, seals and the procedures for lubrication and inspection are almost the same as those used on the 19 degree bevel gearbox.
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Bevel Gearbox, 19 degree Figure 014
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T-Gearbox Figure 015
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D. Bevel Gearbox, 63.5 degree (6009CM/6059CM, 6011CM/6061CM)
(Ref. Fig. 016)
The four 63.5 degree bevel gearboxes have a 1:1 ratio and are the same. Bearings, seals and the procedure for lubrication and inspection are almost the same as those used on the 19 degree bevel gearbox.
E. Torque Shafts and Steady Bearings
**ON A/C 001-049, 051-061, 101-103, 201-203,
(Ref. Fig. 017) R **ON A/C 062-099, 104-149, 151-199, 204-299, 301-399, 401-499,
(Ref. Fig. 017A)
**ON A/C ALL
The torque shafts are made of stainless steel. They have end fittings, which are welded. The end fittings have a flange for a bolted joint or splines for a sliding end connection. Bolts attach universal joints and splined movable joints to the flanges where necessary. The universal joints permit large angular changes of alignment and the splined movable joints allow small angular changes of alignment.
Each shaft has at least one sliding end connection. The external part of the sliding end connection has an indicator groove. It shows when the engagement of the external and internal parts is below a minimum.
Steady bearings, which support the torque shafts, are attached to the structure with bolts.
F. Actuator
**ON A/C 001-049, 051-061, 101-105, 151-152, 201-204,
(Ref. Fig. 018)
Bevel Gearbox, 63.5 degree Figure 016
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