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(WARNING)
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AMBER MESSAGE (ADVISORY)
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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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08/09/21

Message Overview:

Message Name:

ERRATIC HOT FRONT CABIN

Identifier: 216OBS001
Effectivity: AIRCRAFT 20501 - 20999
System: Air Conditioning
Associated CAS: None
System Description: 36-11-00
Schematic Diagram: 21-61-00
Wiring Diagram: 21-61-21 (Cabin Vents)
21-61-25 (Cockpit Vents)
21-61-29 (Hot Air Temp Sensors)

Message Description:

The cabin temperature will be too hot in the front cabin and too cold in the back. The upper cabin register will also have an excessive airflow.

  • The hot air outlet of the injector has a 1.5" cap with a 0.240" hole in the middle of it that is welded to the duct. Should this cap break off at the weld and detach from the unit, an excess of hot air will flow through the upper cabin register.

Possible Causes:

  • Cabin Trim Injector

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of Differential Pressure Sensor AMM 21-51-03-000-801
Installation of Differential Pressure Sensor AMM 21-51-03-400-801
Removal of Bleed Pressure Transducer AMM 36-11-03-000-801
Installation of Bleed Pressure Transducer AMM 36-11-03-400-801
Cleaning of the Ventilated Temperature Sensor AMM 21-61-00-110-801

Troubleshooting Recommendations:

NOTE: The hot air outlet of the injector has a 1.5" cap with a 0.240" hole in the middle of it that is welded to the duct. Should this cap break off at the weld and detach from the unit, an excess of hot air will flow through the upper cabin register.

  1. Duplicate or verify the air conditioning system operation IAW AMM 21-52-00-710-801.
  2. Troubleshoot if after five (5) minutes, the upper cabin register has an excessive airflow and an abnormally high temperature when the cabin selector is turned counter clockwise to the COLD position on the AIR COND/BLEED control panel.
  3. Remove the Cabin Trim Injector IAW AMM 21-61-49-000-801.
  4. Visually inspect the Cabin Trim Injector. Check for the presence of the hot air outlet restrictor cap. If present, check the integrity of the weld.
  5. Should the restrictor cap be missing, it must be retrieved from the aircraft ducting and the Cabin Trim Injector must be replaced.

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