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(WARNING)
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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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06/22/21

Message Overview:

Message Name:

AIR CONDITIONING PACK OFF OR CYCLING ON/OFF

Identifier: 215OBS001
Effectivity: All
System: Air Conditioning
Associated CAS: None
System Description: 21-52-00
Schematic Diagram: 21-51-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 21-51-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

One Air Conditioning PACK is cycling ON/OFF intermittently.

You may also observe one engine "hunting" between HP and LP bleed.

Possible Causes:

  • Trim Air Check Valve
  • PACK Inlet Flow Sensors (PIFS) (MT66)
  • PACK Inlet Flow Sensors (PIFS) (MT109)
  • Flow Control Valve (FCV) (L24)
  • Flow Control Valve (FCV) (L30)
  • Secondary Power Distribution Assembly (SPDA) 2 (A14)
  • Secondary Power Distribution Assembly (SPDA) 3 (A15)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Notice To Operators (NTO): None

Flight Operation Notifications Manual (FONM): None

Quick Links:

Start the Engine AMM 71-00-00-866-806 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Hot Air Shutoff−Valves AMM 21-60-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Hot Air Shutoff−Valves AMM 21-60-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Trim Air Check−Valves AMM 21-60-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Trim Air Check−Valves AMM 21-60-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Pack Inlet Flow−Sensors AMM 21-51-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Pack Inlet Flow−Sensors AMM 21-51-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Flow Control Valves AMM 21-51-25-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Flow Control Valves AMM 21-51-25-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Secondary−Power Distribution Assemblies AMM 24-62-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Secondary−Power Distribution Assemblies AMM 24-62-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Perform an engine run with both engines running.
  2. With both engines at idle power, slowly increase the throttle on one of the engines to just before the engine bleed switches from HP to LP. Observe the bleed pressure on the synoptic page for the opposite engine.

    1. If the bleed pressure of the opposite engine rises, go to step 4
    2. If the bleed pressure on the opposite side does not rise, continue with next step

  3. Bring engine throttle back to idle. Slowly increase the throttle  on the other engine and observe the bleed pressure on the synoptic page for the opposite engine.

    1. If the bleed pressure of the opposite engine rises, continue with next step
    2. If the bleed pressure on the opposite side does not rise, go to step 7

  4. Select the TRIM AIR switch to "OFF" and confirm that the bleed pressure comes back down to normal on the engine at idle power.
  5. On the side that the bleed pressure rose during the previous tests, remove the HASOV. Inspect the Trim Air Check Valve for any damage or obstruction.
  6. Replace the Trim Air Check Valve as necessary. Inspect the damaged Trim Air Valve carefully and if parts of the valve are missing, you may need to perform a visual inspection of the air conditioning system downstream.
  7. Swap the left and right PACK Inlet Flow Sensors.

    1. If the observed fault transfers to the other side, replace the defective PACK Inlet Flow Sensor
    2. If the observed fault does not transfer to the other side, continue with next step

  8. Swap the left and right FCV.

    1. If the observed fault transfers to the other side, replace the defective FCV
    2. If the observed fault does not transfer to the other side, continue with next step

  9. Swap ACSC 1 with ACSC 2

    1. If the observed fault transfers to the other side, replace the defective ACSC
    2. If the observed fault does not transfer to the other side, continue with next step

  10. Perform a wiring check between the FCV of the affected side and the SPDA providing power to it. Refer to SSM 21-51-00

    1. If all checks are good, continue with next step
    2. If defects are found, repair defective wiring as required

  11. Swap SPDA 2 with SPDA 3.

    1. If the observed fault transfers to the other side, replace the defective SPDA
    2. If the observed fault does not transfer to the other side, continue with next step

  12. Perform a full inspection of the on-side PACK for contamination or water/ice and rectify as required
  13. Do close out.

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