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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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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

02/06/26

Message Overview:

Message Name:

HYDRAULIC PRESSURE GOES FROM DASHES TO MORE THAN 4000 PSI

Identifier: 293OBS001
Effectivity: AIRCRAFT 20501 - 20999
System: Hydraulics
System Description: 29-30-00 - Indicating
Schematic Diagram: 29-12-00 - Left and Right Hydraulic Systems
Wiring Diagram: 29-31-01-1 - Hydraulic Pressure Transducer (LHS) 20501 to 20886, 20888 to 20890, 20896 to 20898
29-31-01-2 - Hydraulic Pressure Transducer (LHS) 20887, 20891 to 20895, 20899 and Subs
29-31-03-1 - Hydraulic Pressure Transducer (RHS) 20501 to 20886, 20888 to 20890, 20896 to 20898
29-31-03-2 - Hydraulic Pressure Transducer (RHS) 20887, 20891 to 20895, 20899 and Subs
29-31-04 - Hydraulic Pressure Transducer (Auxiliary) - ALL
29-31-05 - Hydraulic Pressure Switch - ALL

Message Description:

After engine start the pressure indication on the Hydraulic Synoptic page went from dashes to more than 4,000 psi.

Possible Causes:

  • Left Hydraulic Pressure Transducer (MT83)
  • Right Hydraulic Pressure Transducer (MT84)
  • AUX Hydraulic Pressure Transducer (MT136)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

General Setup for Maintenance
Standard Aircraft Configuration for Maintenance AMM 12-00-00-867-803
Connect Electrical Power to the Aircraft AMM 24-00-00-861-801
Remove Electrical Power from the Aircraft AMM 24-00-00-861-802
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801
Electrostatic Discharge Safety Precautions AMM 24-00-00-910-802
Maintenance Tasks
Hydraulic Safety Precautions AMM 29-00-00-910-801
Hydraulic Technical Precautions AMM 29-00-00-910-802
Pressurize the Left and Right Hydraulic Systems AMM 29-10-00-862-801
Release Hydraulic Pressure - Left and Right Hydraulic Systems AMM 29-10-00-862-802
Component Location AMM 29-31-00-992-801
Removal of the Hydraulic Pressure Transducer AMM 29-31-01-000-801
Installation of the Hydraulic Pressure Transducer AMM 29-31-01-400-801

Troubleshooting Recommendations:

  1. Remove hydraulic pressure per AMM 29-10-00-862-801.
  2. Interchange L Hydraulic Pressure Transducer (MT83) with R Hydraulic Pressure Transducer (MT84).
  3. Does problem follows transducer to opposite side?

    1. If NO, verify wiring is okay.
    2. If YES, replace faulty transducer.

  4. Do close out.

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