____________
(Ref. Fig. 003)
5.
Interface
_________
(Ref. Fig. 004)
6.
Component Description
_____________________
Not Applicable
7. Operation/Control and Indicating
________________________________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 001)
Hydraulic System - Schematic Figure 003
1EFF : 1 1R 1CES ALL 1 11 1 27-50-00 Page 8 May 01/04
Slat/Flap Interface Figure 004
R 1EFF : 1 1 1CES ALL 1 111 27-50-00 Page 9 May 01/04
**ON A/C 301-399,
(Ref. Fig. 001A)
**ON A/C ALL
(Ref. Fig. 003)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. Extension and Retraction of the Flaps
The operation of the flaps is hydro-mechanical. The PCU operates the mechanical transmission system which moves the flaps to the set position.
The CSU changes the mechanical signals from the slat and flap control lever into electrical signals. These are sent to the SFCC1 and the SFCC2. They compare the position signal with that from the FPPU. When there is a difference between the signals, the SFCC sends a discrete signal to its related valve block of the flap PCU.
Each valve block lets hydraulic fluid flow to and from its hydraulic motor, in relation to the signal from the SFCC. It thus controls the direction in which the hydraulic motor turns (for extension and retraction of the flaps) and its speed (low or high speed).
The torque from the hydraulic motors is transmitted to the differential gearbox, which connects the two motors. The mechanical transmission system then transmits the torque to the actuators which move the flaps.
**ON A/C 301-399,
A. Extension and Retraction of the Flaps and Tabs
The operation of the flaps is hydro-mechanical. The PCU operates the mechanical transmission system which moves the flaps together with the tabs to the set position.
The CSU changes the mechanical signals from the slat and flap control lever into electrical signals. These are sent to the SFCC1 and the SFCC2. They compare the position signal with that from the FPPU. When there is a difference between the signals, the SFCC sends a discrete signal to its related valve block of the flap PCU.
Each valve block lets hydraulic fluid flow to and from its hydraulic motor, in relation to the signal from the SFCC. It thus controls the direction in which the hydraulic motor turns (for extension and retraction of the flaps) and its speed (low or high speed).
The torque from the hydraulic motors is transmitted to the differential gearbox, which connects the two motors. The mechanical transmission system then transmits the torque to the actuators which move the flaps and tabs.
**ON A/C ALL
B. Hydraulic Actuation and Power Transmission
The two hydraulic motors in the PCU give hydraulic actuation. Each hydraulic motor gets power from a different hydraulic system, the Green hydraulic system or the Yellow.
Each hydraulic motor has a valve block and POB. The valve blocks control the direction of rotation and the speed of the output shaft of the PCU. The POB holds the output shaft of the hydraulic motor:
-against torque from the airloads
-when there is a failure in its related hydraulic system
-to lock the transmission at the same time as the WTB.
The flap system will operate at half speed if there is a failure of: - one electrical supply - one hydraulic system - one SFCC, or the failure of one of two electrical components - one engine.
C. Asymmetry and Power Transmission Monitoring
The SFCC1 and the SFCC2 continuously compare position data from the APPUs and the FPPU to monitor the system. They use this data to find asymmetry, runaway and speed failure conditions.
When one SFCC monitors a failure condition:
-
the other SFCC receives a WTB-arm signal
-
the related PCU motor stops and its POB operates
-
the system operates at half speed.
If the other SFCC also sends a WTB-arm signal:
-
the applicable WTBs operate
-
the other PCU motor stops
-
the system locks and gives a warning to the flight crew.
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