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Troubleshooting
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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

06/26/19

Message Overview:

Fault Message:

SLATS JAMMED/ FAILURE TO MOVE

Fault Code:

2750016STD

Associated CAS:

SLAT FAIL
(Caution)

SLAT FAULT
(Caution)

SLAT FLAP FAIL
(Caution)

SLAT FLAP FAULT
(Caution)

Reporting LRU: Power Drive Unit (PDU)
System Description: 27-53-00
Schematic Diagram: 27-50-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: None

Fault Description:

Slat System is not able to move or moves too slowly. Motor under speed: 2360 RPM and Resolver under speed: 4.2 degrees/second for 5 seconds.

Possible Causes:

  • Jammed Actuator
  • Jammed Transfer Gearbox
  • Jammed Angle Gearbox
  • Jammed Slat Tracks
  • Slat Power Drive Unit (PDU)
  • Slat Power Drive Unit Motor (PDU) 1 (B13)
  • Slat Power Drive Unit Motor (PDU) 2 (B14)
  • Left Slat Asymmetry Brake (A130)
  • Right Slat Asymmetry Brake (A131)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

This fault may occur after landing when the pilots are selecting the Slats back to IN and may be induced by ice accumulation on the slat actuation system.

In most case this fault can be reset by selecting the SFCL to another detent.

NOTE: If after three attempts or selecting the SFCL to another detent the fault does not clear, it will latch a fault in both SFCUs in CAIMS. If this fault is happening occasionally make sure the slat actuators are properly lubricated.

Quick Links:

Clear Slat/Flap Control Unit (SFCU) Latched Faults AMM 27-51-05-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Slat/Flap Control Unit (SFCU) AMM 27-51-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Slat/Flap Control Unit (SFCU) AMM 27-51-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Rigging of the Leading Edge Slat-System AMM 27-53-00-820-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Slat-System Torque Tubes AMM 27-53-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Slat-System Torque Tubes AMM 27-53-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Slat Power-Drive Unit (PDU) AMM 27-53-33-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Slat Power-Drive Unit (PDU) AMM 27-53-33-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Slat Power-Drive Unit (PDU) Motors AMM 27-53-37-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Slat Power-Drive Unit (PDU) Motors AMM 27-53-37-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Detailed Inspection of the No. 1 Slat Body-Track Rail AMM 27-53-53-220-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Detailed Inspection of the No. 2, No. 3, and No. 4 Slat Body-Track Rail AMM 27-53-53-220-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to System Diagnostics AMM 45-45-00-970-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

WARNING: Make sure that the PDU motors are cool. If the PDU motors were in operation, they can be hot and you can burn your hands.

  1. On the EMS CDU, select CTRL function and SLAT/FLAP RESET.
    NOTE: Wait at least one minute after SFCU reset to allow self-test to run.
  2. Select slats to another position.

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

  3. Perform mechanical rigging of slats.

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

  4. Perform a general visual inspection of the slat actuators, slat carriage assemblies, and slat tracks.

    1. If inspection procedures fix the fault, do close out.
    2. If fault remains, continue with next step.

  5. Disconnect the torque tube from the left side of the PDU.
  6. Access the CAIMS system diagnostic and release the left slat asymmetric brake from the SFCU 1 or 2.

    1. SYSTEM DIAG
    2. 27-00 FLIGHT CONTROLS
    3. SLAT/FLAP CONTROL UNIT 1(2)
    4. LRU TEST
    5. SLAT RIGGING - SFCU1(2)
    6. Confirm
    7. Highlight SLAT RIG ENABLE COMMAND and Select
    8. Highlight RELEASE L SLAT ASYMMETRIC BRAKE and Select
      NOTE 1: May take more then one attempt to make the brake release selection. If a brake does not release go back to CAIM and reselect the RELEASE SLAT ASYMMETRIC BRAKE selections.
      NOTE 2: Highlight ENGAGE L SLAT ASYMMETRIC BRAKE and select when the check is done.
      NOTE 3: If the power is not available on the A/C, 28 VDC can be applied on the asymmetric brake. Do not apply 28 VDC to the brake for more than one minute. Remove voltage for a minimum of five minutes before you apply 28 VDC again. If it is necessary to extend the brake release time, decrease the voltage to 12 VDC. If you do not obey these instructions, you can cause damage to the brake.
      NOTE 4: If the Asymmetric Brake can not be released you may have a faulty brake.

  7. Manually turn the slat drive line to move the slat panels and make sure the slat drive line turn freely (less than 50 lbf in (5.65 Nm)).

    1. If system does not move freely, find the cause and fix the problem and do close out.
    2. If system moves freely, continue with next step.
      WARNING: Make sure that no persons and equipment are near the slats. The movement of the slats can cause injury to persons and damage to the equipment.
      CAUTION: Over travel stops will be damaged if applying more than 50 lbf in (5.65 Nm) to the torque tube shaft.

  8. Disconnect the torque tube from the right side of the PDU.
  9. Access the CAIMS system diagnostic and release the right slat asymmetric brake from the SFCU 1 or 2 (from the side reporting the fault).

    1. SYSTEM DIAG
    2. 27-00 FLIGHT CONTROLS
    3. SLAT/FLAP CONTROL UNIT 1(2)
    4. LRU TEST
    5. SLAT RIGGING - SFCU1(2)
    6. Confirm
    7. Highlight SLAT RIG ENABLE COMMAND and Select
    8. Highlight RELEASE R SLAT ASYMMETRIC BRAKE and Select
      NOTE 1: Highlight ENGAGE R SLAT ASYMMETRIC BRAKE and Select when the check is done.
      NOTE 2: If the Asymmetric Brake can not be release you may have a faulty brake.

  10. Manually turn the slat drive line to move the right slat panels and make sure the right slat drive line turn freely (less than 50 lbf in (5.65 Nm).

    1. If system does not move freely, find the cause and fix the problem and do close out.
    2. If system moves freely, continue with next step.
      WARNING: Make sure that no persons and equipment are near the slats. The movement of the slats can cause injury to persons and damage to the equipment.
      CAUTION: Overtravel stops will be damaged if applying more than 50 lbf in (5.65 Nm) to the torque tube shaft.

  11. With both torques tubes disconnected from the slat PDU, release both slat motor brakes on PDU via CAIMS and make sure the PDU shaft is moving.

    1. If shaft is moving, do close out.
    2. If shaft is not moving, continue with next step.

  12. Remove PDU slat motor one at the time to isolate the faulty PDU motor.

    1. If shaft is not moving when two motors are removed, go to step 14.
    2. If shaft is moving when a motor is removed, continue with next step.

  13. Replace defective motor.

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

  14. Replace PDU.
  15. Do close out.

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