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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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01/25/21

Message Overview:

PACK FAIL
(Caution)

DDG Reference: 21-50
21-51
21-52
Pilot Action (QRH): ENVR 06-9
System Description: 21-51-00
Schematic Diagram: 21-52-00
Wiring Diagram: 21-51-09
21-52-17

Message Description:

The amber 'PACK FAIL' caution CAS message indicates a failure has been detected in the air conditioning pack system. The message is posted either by the IASC #2A or by the IASC #1A when both Compressor Discharge Temperature Sensors are failed (out of range indication for the CDTS is -55°C or >300°C) or by the IASC #1A or #1B when the pack discharge temperature cannot be maintained within an acceptable range.

  • Or when the Temperature Control Valve is detected failed during PBIT or when both channels of the IASC #1 are failed. The TCV position is monitored for proper position, if the commanded and monitored position differ, the fault is posted.
  • This message is inhibited when the Left Essential bus is not powered.

Possible Causes:

  • Integrated Air System Controller 1 - FWD (IASC 1) (A55)
  • Integrated Air System Controller 2 - AFT (IASC 2) (A56)
  • Compressor Discharge Temp Sensor (CDTS) (MT29)
  • Temperature Control Valve (TCV) (MPE7)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Operational Test of the Cabin Pressure Control System AMM 21-31-00-710-801
Removal of the Integrated Air System (IAS) Controller AMM 21-31-01-000-801
Installation of the Integrated Air System (IAS) Controller AMM 21-31-01-400-801
Operational Test of the Integrated Air System (IAS) Controller AMM 21-31-01-710-801
Removal of the Outflow Valve AMM 21-31-05-000-801
Installation of the Outflow Valve AMM 21-31-05-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Interrogate the MDC as follows:

    1. On the cursor control panel, ensure the toggle switch is to the right and select Anti-Ice, ECS and Fuel buttons simultaneously. The MDC main menu should now be displayed on Display Unit #3.
    2. Using the joystick, select Current Faults (if the fault is active) or Aircraft History to research stored faults. From Aircraft History you can then select Fault Message History and locate the fault. Going into advanced diagnostics will provide an equation id for the fault identified.
    3. Select the MDC fault or equation from the drop down below to provide additional information to assist in troubleshooting.

50_iasc_cooling_control

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