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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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04/22/21

Message Overview:

Message Name:

OIL FILTER BYPASS 1A

Message Code:

B3-303612

Associated CAS:

None

Reporting LRU: L ENG OIL FILTER
System Description: 79-30-00
Schematic Diagram: 79-31-00
Wiring Diagram: None

Message Description:

Left engine oil filter bypass fault 1A.

[MCID 1011]
Oil Filter By-Pass 1A.
Detection of a fault in the oil impending by-pass switch harness between the oil impending by-pass switch and the ECU A. The ECU A cannot support full system operation.

Possible Causes:

  • Wiring Harness (W6)
  • Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit A (ECU) (A40)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Engine Electronic Control Unit (ECU) AMM 76-10-05-000-801
Installation of the Engine Electronic Control Unit (ECU) AMM 76-10-05-400-801
Removal of the Oil Pump AMM 79-21-01-000-802
Installation of the Oil Pump AMM 79-21-01-400-802
Removal of the Oil Filter AMM 79-21-05-000-801
Installation of the Oil Filter AMM 79-21-05-400-801
Removal of the Chip Detector AMM 79-21-09-000-801
Installation of the Chip Detector AMM 79-21-09-400-801
Removal of the Oil Filter Bypass-Indicator AMM 79-31-01-000-802
Installation of the Oil Filter Bypass-Indicator AMM 79-31-01-400-802
Removal of the Oil Temperature Transducer AMM 79-31-05-000-801
Installation of the Oil Temperature Transducer AMM 79-31-05-400-801
Removal of the Oil Pressure Transducer AMM 79-31-09-000-801
Installation of the Oil Pressure Transducer AMM 79-31-09-400-801
Removal of the Oil Level Probe AMM 79-31-13-000-801
Installation of the Oil Level Probe AMM 79-31-13-400-801
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Honeywell recommends the troubleshooting and corrective action at the first opportunity to follow an oil filter impending bypass indication. If, abnormal debris is found in the filter or the time since the last filter change is unusually short, the engine can be operated a maximum of 10 hours. This applies if the criteria that follows is met:
    * No chips light.
    * The engine vibration levels are normal.
    * The oil temperature, pressure and other engine parameters are normal.
    * The opposite engine operating parameters are normal.
  2. MCID 1011 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual Subtask 72-00-00-810-171-A01.
  3. If an oil filter impending bypass indication has occurred and the above specifications are not met contact the Honeywell Customer Support Engineer before departure.

ENGOil Filter

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