Fault Message:

FLAPS JAMMED/ FAILURE TO MOVE

Fault Code:

2750015STD

Associated CAS:

FLAP FAIL
(Caution)

FLAP FAULT
(Caution)

SLAT FLAP FAIL
(Caution)

SLAT FLAP FAULT
(Caution)

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

• Jammed Actuator
• Transfer Gearbox
• Angle Gearbox
• Flap Tracks
• Flap Power Drive Unit (PDU)
• Flap Power Drive Unit (PDU) Motor 1 (B11)
• Flap Power Drive Unit (PDU) Motor 2 (B12)
• Left Flap Asymmetry Brake (A128)
• Right Flap Asymmetry Brake (A129)

Advisory Wire/Service Bulletin:

• SB 700-27-052 - SPECIAL CHECK - FLAPS AND SLATS - CHECK OF THE SLAT AND FLAP TORQUE TUBES FOR CORRECT ENGAGEMENT

Forum Articles/Infoservice/Newsletter:

• Forum - Volume 6, Issue 02 - Slats and Flaps Asymmetry Brake Reliability Improvement - ATA 27
• Forum - Volume 5, Issue 15 - Slat or Flap Asymmetry Brake upgrade - ATA 27
• Forum - Volume 5, Issue 09 - Top Plug Missing On Slat and Flap Asymmetry Brake - ATA 27

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 doesn't clear, it will latch a fault in both SFCUs in CAIMS.

If this fault is happening occasionally make sure the flap actuators are properly lubricated.

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 flaps 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 flaps.

   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 flap actuators, flap carriage assemblies, and flap 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 flap 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. FLAP RIGGING - SFCU1(2)
   6. Confirm
   7. Highlight FLAP RIG ENABLE COMMAND and Select
   8. Highlight RELEASE L FLAP A-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 FLAP A-BRAKE selections.
      NOTE 2: Highlight ENGAGE L FLAP A-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 A-brake can't be released you may have a faulty brake.

7. Manually turn the flap drive line to move the flap panels and make sure the flap 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 flaps. The movement of the flaps 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 flap 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. FLAP RIGGING - SFCU1(2)
   6. Confirm
   7. Highlight FLAP RIG ENABLE COMMAND and Select
   8. Highlight RELEASE R FLAP ABRAKE and Select
      NOTE 1: Highlight ENGAGE R FLAP ABRAKE and Select when the check is done.
      NOTE 2: If the A-brake can’t be release you may have a faulty brake.

10. Manually turn the flap drive line to move the right flap panels and make sure the right flap 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 flaps. The movement of the flaps 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.

11. With both torques tubes disconnected from the flap PDU, release both flap 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 flap motors 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.