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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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04/06/21

Message Overview:

Message Name:

L BLEED PRESSURE LOW

Message Code:

B3-006391

Associated CAS:

L BLEED FAIL
(Caution)

Reporting LRU: BLEED VALVE 1
System Description: 36-10-00
Schematic Diagram: 36-11-00
Wiring Diagram: 36-11-03

Message Description:

The Left Bleed Pressure on the intermediate pressure stage has been detected below the minimum allowed limit of 15 psig. Check the value of the left bleed valve regulated pressure.

Possible Causes:

  • Bleed Pressure Sensor 1 (Left Bleed Pressure Transducer) (MT21)
  • Integrated Air System Controller 1 (IASC) (A55)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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 Bleed Air System AMM 36-11-00-710-801
Removal of the Bleed Pressure Transducer AMM 36-11-03-000-801
Installation of the Bleed Pressure Transducer AMM 36-11-03-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset the PRESS 1 / PACK circuit breaker CB1-D14.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Do wiring check between the L BLEED PRESSURE SENSOR (MT21) and the IASC 1. Repair as required.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. Swap L BLEED PRESSURE SENSOR (MT21) with the R BLEED PRESSURE SENSOR (MT22).

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  4. Do the Operational Test of the Bleed Air System.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  5. Swap IASC 1 with the IASC 2.
  6. Do close out.

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