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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
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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

04/26/21

Message Overview:

Message Name:

ELEVATOR BINDING OR STIFF

Message Code: 273OBS004
Effectivity: All
System: Flight Controls
System Description: 27-31-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

Elevator control feels like it is binding or stiff.

Possible Causes:

  • Power Control Unit (PCU)
  • PCU Link Attachments
  • Elevator Cable tension
  • Elevator Cable Pulleys
  • Fwd and Aft Quadrant rigging
  • Elevator Control Rods
  • Elevator Control Servo

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Operational Test of the Elevator Servo AMM 22-11-21-710-801
Operational Test of the Elevator Control System AMM 27-31-00-710-801
Functional Test of the Elevator Cable Tension AMM 27-31-00-720-801
Functional Test of the Elevator Control System AMM 27-31-00-720-802
Detailed Inspection of the Elevator Torque Tube Centering Mechanism AMM 27-31-05-220-801
Lubrication of the Elevator Power-Control Unit (PCU) Attachment Link AMM 27-31-09-640-801

Troubleshooting Recommendations:

  1. Perform the Operational Test of the Elevator Control System (AMM 27-31-00-710-801). Take note of any abnormal behavior or results.
  2. Perform the Functional Test of the Elevator Control System (AMM 27-31-00-720-802). Pay attention to the elevator PCU link movement.
  3. Verify the Elevator cable tension (AMM 27-31-00-720-801). Adjust if necessary.
  4. Inspect the elevator cables for any cuts, damage or chafing with the structure.
  5. Inspect the cable pulleys for any damage or friction.
  6. Verify the free movement of the rig pins in the fwd and aft quadrant assemblies.
  7. Inspect the elevator PCUs for any hydraulic leaks.
  8. Check the elevator PCU attachment link lubrication (AMM 27-31-09-640-801). Lubricate if necessary.
  9. Cycle the elevator from the pilot side, then the copilot side. Pay attention to any differences between the two sides.
  10. Pull the Pitch Disconnect and cycle the elevator. Pay attention to any difference.
  11. Disconnect Rod 1 (R1) from the aft quadrant to isolate the cable from the tail push rod.

    1. If the binding is still felt in the control column, check the pilot side elevator cable system pulley and inspect for any damage or if the pulley is seized.
    2. If NO binding is felt, access the vertical stabilizer and inspect the control rods for freedom of movement.

  12. If issue persists, perform procedure (E) of the Detailed Inspection of the Elevator Torque Tube Centering Mechanism (AMM 27-31-05-220-801).
  13. Perform the Operational Test of the Elevator Servo (AMM 22-11-21-710-801). With the help of a second person, pay attention to any unusual noises coming from the servo or servo mount while it is operated.
  14. Bleed the hydraulic system 1 and 2 to remove any air trapped in the systems.
  15. If issue persists, contact the Bombardier Customer Response Center (CRC) for more troubleshooting.
  16. Do close out.

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