-
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.
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(c) WTB
Each flap channel monitors its related WTB solenoids for open circuit or short circuit when the WTB is not electrically energized. If there is a failure with the correct WTB power available:
-the ECAM display unit shows a failure message.
(d) PPU
If one flap channel finds failures (asymmetry, runaway, overspeed or uncommanded movement), but does not receive the WTB-arm signal from the other channel:
-
the SFCCs 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 flaps operate at half speed.
(e) Valve Blocks
1_ LVDT
Each flap 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 flaps operate at half speed.
2_ Solenoid Valves
Each flap channel monitors the position of the solenoid valves
on its related valve block. The flap channels use the signals
from the LVDT to compare the position of the control valve
with the signals to the motor. 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 flaps operate at half speed.
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3 Hydraulic Pressure
_ Each flap 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 the signals to the motor (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 flaps 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 caution and the failure message
-
the flaps operate at normal speed.
If there is low pressure, the SFCCs stop system jam
monitoring.
(f) Hydraulic Motors
Each flap 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 flap 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 flaps operate at half speed.
When the aircraft is on the ground, half speed monitoring stops.
(5) Monitoring of Input and Output Signals
(a) ARINC 429 Inputs from other Systems
Each flap channel monitors ARINC 429 inputs from:
-
the Landing Gear Control Interface Unit (LGCIU)
-
the Air Data/Inertial Reference Unit (ADIRU)
-
the Centralized Fault Display Interface Unit (CFDIU).
Incorrect data or no data does not stop the normal flap operation. If there is no data for more than 10 seconds in flight, the CFDS gets a failure message.
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(b)
ARINC 429 Input from Cross-Computer Link
Each flap channel monitors the other flap channel for the correct operation. If there is no data for more than 10 seconds in flight, the CFDS gets a failure message.
(c)
Installation Coding
Each flap 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.
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