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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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Quick Links

02/06/26

Message Overview:

Message Name:

LEFT DCMP CYCLING AFTER LANDING WHEN SET ON AUTO

Identifier: 291OBS001
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

Message Description:

After landing, the left hydraulic DC Motor Pump (DCMP) turns on and cycles when it is set on AUTO mode.

Possible Causes:

  • Nose Wheel Steering Switch left ON

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
Standard Aircraft Configuration for Maintenance AMM 12-00-00-867-803
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801
Electrostatic-Discharge Safety Precautions AMM 24-00-00-910-802
Component Location AMM 32-51-00-992-801
Operational Test of the Nosewheel-Steering Control System AMM 32-51-00-710-801
Functional Test of the Nosewheel-Steering Control AMM 32-51-00-720-801

Troubleshooting Recommendations:

  1. If the left DCMP turns on and starts cycling after landing when it is set on AUTO only, make sure to verify the Nose Wheel Steering Selector Switch.
  2. If the switch is set to ON, set the switch to OFF.
  3. Confirm the left DCMP turns OFF in AUTO mode.
  4. Do close out.

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