10/08/25
Message Overview:
Message Name:
PACK DISCHARGE UNDERPRESSURE
| Identifier: | 216OBS005 |
| Effectivity: | All |
| System: | Air Conditioning |
| Associated CAS: | None |
| System Description: | 21-60-00 - Air Conditioning System |
| Schematic Diagram: | 21-60-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | None |
Message Description:
Pressure of the pack discharge is less than the cabin pressure.
Possible Causes:
- Pack discharge duct is disconnected or there is high leakage
- There is a leak in the sense line of the pack discharge pressure sensor
- There is an ice blockage in the sense line of the anti-icing pressure sensor between the air cycle machine and the pressure bulkhead (FS 861.00).
- Mechanical failure of the air cycle machine
- Pack inlet flow sensor
- For a problem on the right side, the ram air valve failed in the open position.
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None
Flight Operation Notifications Manual (FONM): None
Troubleshooting Recommendations:
- Perform the following CAIMS troubleshooting:
- Do close out.