-
the slats operate at half speed.
If the failure resets within 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 slat 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 slats 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 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:
1EFF : ALL 1 27-81-00Page 35 1 1 May 01/05R 1 1 1CES 1
-
the SFCCs give a class 1 level 2 caution after the slats 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
-
the WTBs lock the transmission system
-
the SFCCs give a class 1 level 2 caution and the ECAM display unit shows a failure message
-
the slats do not operate until reset on the ground.
(c) WTB
Each slat channel monitors its related WTB solenoids for open circuit or short circuit. If there is a failure with the correct WTB power available:
-the ECAM display unit shows a failure message.
(d) PPU
If one slat channel finds failures because of PPU differences, but does not receive the WTB-arm signal from the other channel:
-
the SFCC will find a failure in one synchro of the related PPU
-
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.
(e) Valve Blocks
1_ LVDT
Each slat channel monitors its related LVDT for the correct
operation. If there is a failure, the SFCCs memory keeps the
related data and sends it to the CFDS. If the failure stops
the operation of the motor:
- 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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2_ Solenoid Valves
Each slat channel monitors the position of the solenoid valves
on its related valve block. The slat channels use the signals
from the LVDT to compare the position of the control valve
with that commanded. If a valve does not close after a signal:
- the channel will not try to drive the motor when the SFCC
gets DC power
- the SFCCs give a class 1 level 1 caution and the ECAM
display unit shows a failure message
- the slats operate at half speed.
3_ Hydraulic Pressure
Each slat channel monitors the hydraulic pressure available to
move its related motor. It uses signals from the LVDT to
compare the position of the control valve with that commanded
(Ref. 27-54-00). If there is low pressure:
- the SFCCs give a class 1 level 1 caution and the ECAM
display unit shows a failure message
- the slats operate at half speed.
When hydraulic pressure goes back to its normal condition:
- the SFCCs and the ECAM system cancel the class 1 level 1
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