-
the set position from the CSU.
The SFCCs use this data to find:
-an asymmetry
-a runaway
-
an uncommanded movement
-
an overspeed.
When the SFCCs find any one of these failures:
-
the valve block solenoids on the PCU are de-energized
-
the POBs are applied and stop their related hydraulic motors
-each channel arms its own WTB circuits and sends a WTB-arm signal to 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.
When the WTBs have locked the system, reset is only possible on the ground.
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(2) Flap-Attachment Failure Detection Sensors
The SFCCs monitor the flap-attachment failure detection sensors to find connection failure. If the SFCCs receive a flap disconnect signal:
-
the valve block solenoids on the PCU are de-energized
-
the POBs lock the two hydraulic motors
-
the SFCCs give a class 1 level 2 caution and the ECAM display unit shows a failure message.
System reset is only possible on the ground.
The ECAM display unit shows a failure message if:
-the SFCC gets different data from the two sensors on the same wing
or
- one sensor gives incorrect data.
(3) System Jam
The SFCC will find a system jam if the system speed is below 2% nominal for more than 4 seconds.
When the SFCCs find a system jam:
-
the valve block solenoids on the PCU are de-energized
-
the POBs are applied and stop their related hydraulic motors
-
the SFCCs give a class 1 level 2 caution and the ECAM display unit shows a failure message.
If the SFCCs receive a new correct CSU signal, the SFCCs go back to
their normal operation.
If there is low hydraulic pressure, the SFCCs stop system jam
monitoring.
(4) LRU Monitoring
(a) SFCC1 and SFCC2
Each lane of each flap channel receives output signals from the other lane in the same channel. Each lane compares these signals with its own output signals. If there is a difference for more than 320 milliseconds and minor failure steps are taken:
-
the solenoids on the related valve block are de-energized
-
the POBs lock their related hydraulic motor
-
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 flaps operate at half speed.
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If the failure resets in 5 seconds, the channel returns to its normal operation. The SFCCs cancel the caution and the WTB-arm signal. If the failure is still there after 5 seconds then a major failure step is taken:
-the SFCC arms the WTB for the defective channel.
The major failure step is also taken if 10 minor failures occur within 3 minutes.
If there is a failure in the two flap channels:
-
the solenoids on the two valve blocks are de-energized
-
the POBs lock their related hydraulic motor
-
the WTB for the two channels lock the transmission system
-
the SFCCs give a class 1 level 2 caution and the ECAM display unit shows a failure message
-
the flaps do not operate until reset on the ground.
(b) CSU
The SFCCs monitor the CSU signals for the correct detent or out-of-detent switch patterns.
If the SFCCs receive an incorrect pattern for more than 0.5 seconds:
-
the solenoids on the related valve block are de-energized.
-
the POBs lock their related hydraulic motor
-
the SFCCs give a class 1 level 1 caution and the ECAM display unit shows a failure message.
If the SFCCs receive an out-of-detent pattern for more than 10 seconds:
-
the SFCCs give a class 1 level 2 caution after the flaps are at the last set position
-
the ECAM display unit shows a failure message.
If a CSU disadjust failure is detected:
-
the solenoids on the two valve blocks are de-energized
-
the POBs lock their related hydraulic motor
-each channel arms its own WTB and sends a WTB-arm signal to the other channel
-
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