|  76  | OFV_DISCRETE_MUX_FAIL  | OUTFLOW VALVE ELEC 1 (2)  |
 |  | or  |  |
 |  | MOTOR_DIRECTION_WR_FAIL (AMI)  | OUTFLOW VALVE ELEC 1 (2)  |

 |-------|--------------------------------------|------------------------------|

 .-------.--------------------------------------.------------------------------. | FAULT | FAULT ORIGIN | CFDS MESSAGE | | CODE | | | |-------|--------------------------------------|------------------------------| | 77 | OFV_SENSOR_EXCITATION_FAIL | OUTFLOW VALVE ELEC 1 (2) | |-------|--------------------------------------|------------------------------| | 78 | OFV_SENSOR_RANGE_FAIL | OUTFL.V FEEDB ASSY 1 (2) | |-------|--------------------------------------|------------------------------| | 79 | OFV_AC_ID_A320 | | |-------|--------------------------------------|------------------------------| | 80 | OFV_A/D_FRAME_LATE_FAIL | | |-------|--------------------------------------|------------------------------| | 81 | OFV_LOOP_CLOSURE_FAIL | OUTFLOW VALVE | |-------|--------------------------------------|------------------------------| | 82 | OFV_UNUSED_INTR | | |-------|--------------------------------------|------------------------------| | 83 | OFV_ALU_FAIL | OUTFLOW VALVE ELEC 1 (2) | |-------|--------------------------------------|------------------------------| | 84 | OFV_CHAN1_SEL | | |-------|--------------------------------------|------------------------------| | 85 | UNUSED | | |-------|--------------------------------------|------------------------------| | 86 | UNUSED | | |-------|--------------------------------------|------------------------------| | 87 | OFV_A/D_CONVERT_FAIL | OUTFLOW VALVE ELEC 1 (2) | |-------|--------------------------------------|------------------------------| | 88 | OFV_HALL_SENSOR_FAIL | OUTFL.V AUTO MOTOR 1 (2) | |-------|--------------------------------------|------------------------------| | 89 | OFV_SW_INTR_FAIL | | |-------|--------------------------------------|------------------------------| | 90 | OFV_CAB_PRESS_SWITCH_ACTIVE | | |-------|--------------------------------------|------------------------------| | 91 | OFV_RS422_MSSAGE_FAIL | | |-------|--------------------------------------|------------------------------| | 92 | OFV_AC_PIN_PROG_FAIL | | |-------|--------------------------------------|------------------------------| | 93 | UNUSED | | |-------|--------------------------------------|------------------------------| | 94 | UNUSED | | |-------|--------------------------------------|------------------------------| | 95 | UNUSED | | |_______|______________________________________|______________________________|

 F. MCDU Maintenance Messages
 NOTE : The details which follow are only applicable for:

____ -Cabin Pressure Controllers 20791-02AB and subsequent. If there is a failure, a maintenance message is shown on the MCDU. A failure in the CPCS can be class 1 or class 3. Class 1 failures require immediate maintenance action, as they always lead to a loss of the affected system with operational consequences. A class 3 failure is not as important, but should be observed for frequent recurance.
 (1) Class 1 Maintenance Messages NOTE : (XX) = the related fault code for shop maintenance.
____
 -------------------------------------------------------------------------------| BITE TEST |-----------------------------------------------------------------------------| | INDICATION ON THE MCDU | ATA REF. | BITE DETECTION | -------------------------------------------------------------------------------
PRESS CONTROLLER 1 (XX) 21-31-34 CPC 1 fault
 PRESS CONTROLLER 2 (XX) 21-31-34 CPC 2 fault
 OUTFLOW VALVE ELEC 1 (XX) 21-31-51 OFV electronic box 1 fault
 OUTFLOW VALVE ELEC 2 (XX) 21-31-51 OFV electronic box 2 fault
 (2) Class 3 Maintenance Messages NOTE : (XX) = the related fault code for shop maintenance.
____ -------------------------------------------------------------------------------| BITE TEST |-----------------------------------------------------------------------------| | INDICATION ON THE MCDU | ATA REF. | BITE DETECTION |
 -------------------------------------------------------------------------------PRESS CONTROLLER 1 (XX) 21-31-34 CPC 1 fault PRESS CONTROLLER 2 (XX) 21-31-34 CPC 2 fault OUTFL.VAL.BLOCKED (XX) 21-31-51 Outflow valve fault (mechanical) FMGS 1 OUT OF RANGE (XX) 22-83-34 CPC 1(2) receives incorrect FMGS data FMGS 2 OUT OF RANGE (XX) 22-83-34 CPC 1(2) receives incorrect FMGS data

 -------------------------------------------------------------------------------| BITE TEST |-----------------------------------------------------------------------------| | INDICATION ON THE MCDU | ATA REF. | BITE DETECTION | -------------------------------------------------------------------------------
NO DATA FROM FMGS 1 (XX) 22-83-34
NO DATA FROM FMGS 2 (XX) 22-83-34
　
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