-
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.
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.
(e) System Ground Operation Inhibit
The System Ground Operation Inhibit (SGOI) prevents flap system 2 operation during cargo door operation.
The SFCC 2 gets a SGOI signal when the Yellow hydraulic system is pressurized and the FWD or AFT cargo doors are operated. When the manual selector 2501MJ or 2504MJ is switched to FWD/AFT cargo door open or closed, the relay 3811GX transmits a SGOI signal to the flap channel of the SFCC 2.
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If the SFCC 2 detects a SGOI condition on the ground when the flap system 2 is in operation, it:
-performs a shutdown of the PCU valve block (Yellow hydraulic system)
-inhibits further PCU valve block operation
-transmits a warning signal to the Flight Warning Computor (FWC) and on the Engine Warning Display (EWD) shows a FLAP SYS 2 FAULT
-will put a message in the SFCC 2 flap channel.
If the SFCC 2 detects a SGOI condition on the ground when the
flap system 2 is not in operation, it:
-inhibits PCU valve block operation.
During normal operation of the flaps, the SGOI signal will have no effect on the operation of the flap system 1.
If the SGOI condition is cancelled and the SFCC gets a valid
CSU command, it:
-
cancels the PCU valve block inhibition
-
cancels the warning signal to the FWC.
If the SFCC detects a SGOI condition in flight, it:
-shows the failure message 'WRONG INHIBIT SIGN FROM CARGO DOOR YELLOW SYSTEM' in the SFCC 2 class 3 faults flap.
(f) ARINC 429 Outputs (Wraparound)
Each flap 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.
(6) Monitoring of Power Supplies
(a) SFCC DC Supply
Each flap 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 flaps operate at half speed.
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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 flap 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 after flight
-
the CFDS gets a failure message.
(c) Synchro Excitation Power
Each flap 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 flaps operate at half speed.
If the synchro excitation power goes back to the correct value, the flaps will operate as normal. If the other channel receives the WTB-arm signal:
-
the WTB lock the transmission system
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本文链接地址：A320飞机维护手册 AMM FLIGHT CONTROLS 飞行操纵4(17)
