-
A class 2 failure will not lead to operational consequences but cannot be left uncorrected until the next scheduled maintenance check.

 -Class 3 failure are failures which can be left uncorrected until
 the next scheduled maintenance check. The possible maintenance messages (class 1, 2, 3) provided by the heating controller are shown in the following tables.
 (2) Class 3 Maintenance Messages
 -------------------------------------------------------------------------------| BITE TEST |-----------------------------------------------------------------------------| | INDICATION ON THE MCDU | ATA REF. | BITE DETECTION | -------------------------------------------------------------------------------
AFT TEMP SELECTOR 21-43-16  TEMP SELECTOR RANGE
 AFT CARGO HEAT CONT 21-43-34  TEMP SELECTOR INTERFACE
 PIN PROGR. "A" INP. INTERFACE
 PIN PROGR. "B" INP. INTERFACE
 AFT CODING
 SHOP CODING

 NO DATA FROM CFDS 31-32-34  ARINC INPUT
 1EFF : ALL 1 21-43-00Page 33 1 1 May 01/05R 1 1 1CES 1

 MCDU Indications Figure 009 (SHEET 1)
 1EFF : 1 1R 1CES  ALL  1 11 1 21-43-00 Page 34 May 01/05

 MCDU Indications Figure 009 (SHEET 2) 
R 1EFF : 1 1 1CES  ALL  1 111 21-43-00 Page 35 May 01/05

 (3) Class 2 Maintenance Messages
 -------------------------------------------------------------------------------| BITE TEST |-----------------------------------------------------------------------------| | INDICATION ON THE MCDU | ATA REF. | BITE DETECTION | -------------------------------------------------------------------------------
AFT TAPRV SHUT OFF RELAY 21-43-00  AFT TAPRV A. C. SHUT OFF RELAY
 AFT PRESSUR REG VALVE 21-43-52  AFTER TAPRV MOVEMENT

R **ON A/C 001-049, 051-099, 101-149, 151-199, 221-221, 224-224, 228-228, R 401-499,
 (4) Class 1 Maintenance Messages
 -------------------------------------------------------------------------------| BITE TEST |-----------------------------------------------------------------------------| | INDICATION ON THE MCDU | ATA REF. | BITE DETECTION | -------------------------------------------------------------------------------
AFT DUCT TEMP SENSOR 21-43-15  DUCT SENSOR RANGE
 COMP SENSOR RANGE

 AFT CARGO HEAT CONT 21-43-34  RAM 0 DATA RAM 1 DATA EPROM DATA ARINC OUTPUT DUCT SENSOR INTERFACE COMP SENSOR INTERFACE TAV POS. SENSOR INTERFACE A/D CONVERTER STEPP. MOT. INTERFACE PHASE "A" STEPP. MOT. INTERFACE PHASE "B" STEPP. MOT. INTERFACE PHASE "C" STEPP. MOT. INTERFACE PHASE "D" CARGO DOOR NFC INP. INTERFACE TAV NFC INPUT INTERFACE TAV NFO INPUT INTERFACE ISOL. V. FC INPUT INTERFACE RESETT/OFF INPUT INTERFACE FAN FAULT INP. INTERFACE BULK CARGO DOOR FC INP. INTERFACE TAPRV FC INPUT INTERFACE

 -------------------------------------------------------------------------------
| BITE TEST |-----------------------------------------------------------------------------| | INDICATION ON THE MCDU | ATA REF. | BITE DETECTION | -------------------------------------------------------------------------------
CONTR. FAULT OUTP. INTERFACE
 OVHT OUTP. INTERFACE
 TAPRV AUTO CLOSE OUTP. INTERFACE
 AFT TRIM AIR VALVE 21-43-51  TAV MOTOR
 TAV MOVEMENT
 TAV CLOSURE SPRING

 **ON A/C 201-220, 222-223, 225-227, 229-299,
 (4) Class 1 Maintenance Messages
 -------------------------------------------------------------------------------| BITE TEST |-----------------------------------------------------------------------------| | INDICATION ON THE MCDU | ATA REF. | BITE DETECTION | -------------------------------------------------------------------------------
AFT DUCT TEMP SENSOR  21-43-15  DUCT SENSOR RANGE
 COMP SENSOR RANGE
 AFT CARGO HEAT CONT  21-43-34  RAM 0 DATA
 RAM 1 DATA
 EPROM DATA
 ARINC OUTPUT
 DUCT SENSOR INTERFACE
 COMP SENSOR INTERFACE
 TAV POS. SENSOR INTERFACE
 A/D CONVERTER STEPP. MOT. INTERFACE PHASE "A"
 STEPP. MOT. INTERFACE PHASE "B"
 STEPP. MOT. INTERFACE PHASE "C"
 STEPP. MOT. INTERFACE PHASE "D"
 CARGO DOOR NFC INP. INTERFACE
 TAV NFC INPUT INTERFACE
 TAV NFO INPUT INTERFACE
 ISOL. V. FC INPUT INTERFACE
 RESETT/OFF INPUT INTERFACE FAN FAULT INP. INTERFACE
 TAPRV FC INPUT INTERFACE 
　
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