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The standby channel disconnects all its torque motor and solenoid output drivers from the external loads.
With a normal healthy status (no faults), all the assignments are connected in the active channel. Some driver output assignments are switched through paired disconnect relays.
The respective assignments are :
- BSV & SAV (K1)
- TRPV & FRV1 (K2)
- VBV (K3)
- TRDV & LPTC (K4)
- VSV (K5) - FMV (K6) - HPTC & TBV (K7)
If there is a failure on the active channel, the disconnect relays of the functions that are faulty are opened to prevent damage to the engine.
 
Cross channel active / standby sensing.
Each FMV and VSV output driver disconnect relay has a second set of contacts that are cross-connected to the opposite channel.
These relay contacts provide hardware confirmation of the cross channel active / standby status.
 

EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION ARCHITECTURE
FAULT DETECTION
& ANNUNCIATION Page 12
Nov 02
  
 
OUTPUT DRIVER DISCONNECT
 
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION ARCHITECTURE
FAULT DETECTION
& ANNUNCIATION Page 13
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

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EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION ARCHITECTURE
FAULT DETECTION
& ANNUNCIATION Page 14
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

INTERFACES
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION INTERFACES
FAULT DETECTION
& ANNUNCIATION Page 1 Nov 02
  
 
  CFM56-5B TRAINING MANUAL

 
FADEC INTERFACES
There are many aircraft computers and systems that interface directly, or indirectly with the engine FADEC system.
- Engine Interface Unit (EIU).
- Air Data & Inertial Reference System (ADIRS).
- Flight Management & Guidance Computer (FMGC). - Flight Control Unit (FCU).
- Digital Flight Data Recording System (DFDRS). - Centralized Fault Display Interface Unit (CFDIU). - Engine Vibration Monitoring Unit (EVMU).
- Data Management Unit (DMU).
- Electronic Centralized Monitoring System (ECAM). - Multipurpose Control & Display Unit (MCDU).
- System Data Acquisition Concentrator (SDAC). - Flight Warning Computer (FWC).
- Display Management Computer (DMC). - Slat Flap Control Computer (SFCC).
- Landing Gear Control Interface Unit (LGCIU). - Environmental Control System (ECS).
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
　
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