(f) Hydraulic Motors
Each slat channel monitors the transmission system for half speed operation when there is a hydraulic motor jam. The half speed monitor operates only when the valves of the two valve blocks are in the full speed position. If the slat movement is slower than the minimum speed for two-motor operation:
-
the SFCCs give a class 1 level 1 caution after 8 seconds and the ECAM display unit shows a failure message
-
the slats operate at half speed.
When the aircraft is on the ground, half speed monitoring stops.
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(4) Monitoring of Input and Output Signals
(a)
ARINC 429 Inputs from other Systems
Each slat channel monitors ARINC 429 inputs from the Air Data/Inertial Reference Unit (ADIRU).
(b)
ARINC 429 Input from Cross-Computer Link
Each slat channel monitors the other slat channel for the correct operation. If there is no data for more than 10 seconds, the CFDS gets a failure message.
(c)
Installation Coding
Each slat channel monitors its installation code inputs. If they find an incorrect coding:
-all ARINC 429 outputs, for that channel, change to no computed data
-the CFDS gets a failure message.
(d) Operation Mode Coding
Each slat channel monitors its operation mode coding inputs. If they find an incorrect coding:
-
the ARINC 429 slat and flap system status changes to no computed data
-
the solenoids on the related valve block are de-energized
-
the POBs lock their related hydraulic motor
-
the related channel arms its WTB
-
the other channel receives the WTB-arm signal
-
the SFCCs give a class 1 level 1 caution and the ECAM display unit shows a failure message
-
the slats operate at half speed.
If the channel receives the WTB-arm signal from the other channel:
-
the WTBs lock the transmission system
-
the SFCCs give a class 1 level 2 caution and the ECAM display unit shows a failure message.
Reset is only possible on the ground.
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(e) ARINC 429 Outputs (Wraparound)
Each slat channel monitors its ARINC 429 outputs. Wraparound inputs get the output data. If there is a difference, the related output stops and the CFDS gets a failure message.
(5) Monitoring of Power Supplies
(a) SFCC DC Supply
Each slat channel monitors its primary 28V DC supply and its internal secondary power supply. If the primary power supply goes below 15V DC, or the internal secondary power supply does not operate:
-
the solenoids on the related valve block are de-energized
-
the POB locks the related motor
-
the other channel receives the WTB-arm signal
-
the SFCCs give a class 1 level 1 caution and the ECAM display unit shows a failure message
-
the slats operate at half speed.
NOTE : The failed channel does not arm the WTB in case of
____ interruption of all aircraft DC power. This is to stop the WTB locking the system at the same time when the DC power fails.
(b) WTB DC Supply
Each slat channel monitors the special power supply for its WTB. If the WTB power input goes below 15V DC:
-
the ECAM display unit shows a failure message
-
the CFDS gets a failure message.
(c) Synchro Excitation Power
Each slat channel monitors the correct synchro excitation power. The internal secondary DC power supplies the synchro excitation power. If the voltages or frequency are not correct:
-
the solenoids on the related valve block are de-energized
-
the POB locks the related motor
-
the channel arms the related WTB
-
the other channel receives a WTB-arm signal
-
the SFCCs give a class 1 level 1 caution and the ECAM display unit shows a failure message
-
the slats operate at half speed.
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If the synchro excitation power goes back to the correct value, the slats will operate as normal. If the other channel receives the WTB-arm signal:
-
the WTBs lock the transmission system
-
the SFCCs give a class 1 level 2 caution and the ECAM display unit shows a failure message.
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