-
the two APPUs
-
the FPPU
-
the valve blocks.
An APPU is installed at the end of the transmission system in each wing. The APPUs are the same as, and interchangeable with, the FPPU. One synchro transmitter in each APPU sends position data to the SFCC1. The other synchro transmitter in each APPU sends position data to the SFCC2.
The control valve of each valve block has a Linear Variable Differential Transducer (LVDT) (Ref. 27-54-00). The LVDT sends valve position data to its related SFCC. The position of the valve is directly related to the hydraulic pressure available at the valve block.
(2) LRU Monitoring
The SFCCs monitor these LRUs for failures:
-SFCC1 and SFCC2
-
the CSU
-
the two WTBs
-
the two APPUs
-
the FPPU
-
the valve blocks of the slat PCU.
The SFCCs keep the data related to the failures in their memories.
(3) Monitoring of Input and Output Signals
The SFCCs monitor these input and output signals:
-
the ARINC 429 inputs from other systems
-
the ARINC 429 inputs from the cross-computer link (other SFCC)
-
the installation coding
-
the operation mode codings
-
the ground inhibit
-
the ARINC 429 outputs (wraparound)
If the above signals are not in the specified limits, the SFCCs keep the data related to the failure in its memory. The SFCCs transmit the data to the CFDS.
Other discrete inputs are:
-
the Aircraft On Ground (AOG) discrete
-
the WTB-arm input.
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(4) Monitoring of Power Supplies
The SFCCs monitor these power supplies:
-
the SFCC DC Supply
-
the WTB DC Supply
-
the synchro excitation power generated by the SFCCs
-
the LVDT synchro excitation power generated by the SFCCs.
If the voltage is not in the specified limits, the SFCCs keep the data related to the failure in its memory. The SFCCs transmit the data to the CFDS. If the SFCC DC supply or the synchro excitation power is not in the specified limits, the flight crew get a failure indication.
4. Power Supply
____________
(Ref. Fig. 007)
The electrical power supplies for the slat control and monitoring system are:
-
the essential bus 401PP
-
the normal bus 202PP
-
the battery buses 701PP and 702PP.
The essential bus 401PP supplies:
-
the SFCC1 slat channel
-
the related PCU solenoids
-
the synchro and LVDT excitation voltages.
The battery bus 701PP supplies the WTB solenoids related to the SFCC1.
The normal bus 202PP supplies:
-
the SFCC2 slat channel
-
the related PCU solenoids
-
the synchro and LVDT excitation voltages.
The battery bus 702PP supplies the WTB solenoids related to the SFCC2.
If the WTBs are operated, the battery buses keep the solenoids energized during a SFCC power failure.
5. Interfaces
__________
(Ref. Fig. 008)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 009)
R **ON A/C 301-399,
R (Ref. Fig. 009A)
R **ON A/C ALL
R (Ref. Fig. 010)
6. Component Description_____________________
A. Refer to (Ref. 27-51-00) for data on: - the Slat and Flap Control Lever - the CSU - the SFCC.
B. Valve Block
(Ref. Fig. 011)
The valve block is the same as the valve block of the flaps PCU. Refer to (Ref. 27-51-00) for data on the valve block.
C. Feedback Position Pick-off Unit (FPPU)
(Ref. Fig. 012)
The slats FPPU is the same as the flaps FPPU. Refer to (Ref. 27-51-00) for data on the FPPU.
D. Asymmetry Position Pick-off Unit (APPU)
(Ref. Fig. 013)
The two APPUs are the same as, and interchangeable with, the FPPU. Refer to (Ref. 27-51-00) for data on the FPPU.
E. Adapter Plate
(Ref. Fig. 014)
An adapter plate, attached to the wing structure, connects the APPU to the slat transmission system.
Power Supply Distribution - Schematic
Figure 007
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Slat System Components - Interfaces Figure 008
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