W DOC AIRBUS | TSM A320F

Slat Shaft Overspeed

TASK 27-81-00-810-815-A
Slat Shaft Overspeed

1. Possible Causes
  • slat transmission system
  • SLAT ACTUATOR TYPE A [6013CM]
  • SLAT ACTUATOR TYPE A [6015CM]
  • SLAT ACTUATOR TYPE A [6063CM]
  • SLAT ACTUATOR TYPE A [6065CM]
  • SLAT ACTUATOR TYPE B [6027CM]
  • SLAT ACTUATOR TYPE B [6029CM]
  • SLAT ACTUATOR TYPE B [6035CM]
  • SLAT ACTUATOR TYPE B [6039CM]
  • SLAT ACTUATOR TYPE B [6045CM]
  • SLAT ACTUATOR TYPE B [6077CM]
  • SLAT ACTUATOR TYPE B [6079CM]
  • SLAT ACTUATOR TYPE B [6085CM]
  • SLAT ACTUATOR TYPE B [6089CM]
  • SLAT ACTUATOR TYPE B [6095CM]
  • SLAT ACTUATOR TYPE B [6033CM]
  • SLAT ACTUATOR TYPE B [6037CM]
  • SLAT ACTUATOR TYPE B [6041CM]
  • SLAT ACTUATOR TYPE B [6083CM]
  • SLAT ACTUATOR TYPE B [6087CM]
  • SLAT ACTUATOR TYPE B [6091CM]
  • WING TIP BRAKE [35CV]
  • WING TIP BRAKE [36CV]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 12-22-27-640-006
Lubricate all Track Rollers and Pinions
AMM 27-80-00-866-004
Extending the Slats on the Ground
AMM 27-80-00-866-005
Retracting the Slats on the Ground
AMM 27-80-00-866-006
Reset of the Torque Limiters of the Slat System on the Ground
AMM 27-80-00-869-004
Reset of the Wing Tip Brake (WTB) of the Slat System on the Ground
AMM 27-81-51-000-001
Removal of the Slat Wing-Tip Brake
AMM 27-81-51-400-001
Installation of the Slat Wing-Tip Brake
AMM 27-84-00-200-001
Detailed Visual Inspection of the Slat Transmission System
AMM 27-84-00-210-001
Detailed Visual Inspection of the Slat Track Rollers, the Pinions and the Curved Rack Gears (As Far As Visible)
AMM 27-84-00-710-001
Operational Test of the Slat System
AMM 27-84-48-000-001
Removal of the Type A Actuators
AMM 27-84-48-400-001
Installation of the Type A Actuators
AMM 27-84-49-000-001
Removal of the Type B Actuators
AMM 27-84-49-000-002
Removal of the Type B Actuators
AMM 27-84-49-400-001
Installation of the Type B Actuators
AMM 27-84-49-400-002
Installation of the Type B Actuators
3. Fault Confirmation
Subtask 27-81-00-740-056-A
A. Check
   (1) Do a check of the Post Flight Report (PFR) and identify the related wing on which the fault message was recorded.
If you cannot identify the wing, do the procedure on each wing.
Usually you cannot confirm this fault on the ground.
4. Fault Isolation
Subtask 27-81-00-810-064-A
A. Procedure
   (1) Do the wing tip brake (WTB) reset procedure,
but do not reset the torque limiter(s) at this time AMM 27-80-00-869-004.
   (2) Do the operational test of the slat system, AMM 27-84-00-710-001.
     (a) If a SLATS LOCKED is monitored:
  • Go to the Slat System Status of SFCC 1 or 2.
  • Find if a SLAT TRANSMISSION RUNAWAY or ASYMMETERY shows.
  • Do the WTB reset procedure again (Ref. step (1), but also do not reset the torque limiter(s) at this time).
  • Continue with step 4.A.(3).
     (b) If no fault is found, continue with step 4.A.(4).
   (3) Do the detailed visual inspection of the slat transmission system AMM 27-84-00-200-001. Repair/correct any defect found.
     (a) After the repair/replacement:
  • Do the reset of the torque limiter(s) AMM 27-80-00-866-006.
  • Do the operational test of the slat system, AMM 27-84-00-710-001.
  • Make sure that the slat system is serviceable and make sure that there are no fault messages.
   (4) Do the reset of the torque limiters AMM 27-80-00-866-006 and record a possibly tripped torque limiter.
     (a) If a tripped torque limiter was found:
Examine the related drive station, AMM 27-84-00-210-001. If necessary lubricate the items which were cleaned before for inspection, AMM 12-22-27-640-006.
     (b) If you find a fault, correct or repair as necessary. Refer to AMM 27-8X-XX for the applicable repair, or removal and installation procedures.
     (c) If you find no fault, replace the slat actuators which have a tripped torque limiter:
For the actuator type A:
  • SLAT ACTUATOR TYPE A [6013CM]
  • SLAT ACTUATOR TYPE A [6015CM]
  • SLAT ACTUATOR TYPE A [6063CM]
  • SLAT ACTUATOR TYPE A [6065CM]
AMM 27-84-48-000-001 and AMM 27-84-48-400-001.
For the actuator type B:
   (5) If no tripped torque limiter was found,
Move the slats, AMM 27-80-00-866-004 and AMM 27-80-00-866-005.
     (a) While the flaps move, do a check for incorrect noise at the WTB.
     (b) If there is an incorrect noise at the WTB, replace the WING TIP BRAKE [35CV] or WING TIP BRAKE [36CV] ,
AMM 27-81-51-000-001 and AMM 27-81-51-400-001.
     (c) If there is no incorrect noise at the WTB, disconnect the transmission shafts on each side of the WTB (Ref. see above).
     (d) Make sure that the WTB turns easily, if it does not turn easily, replace the WTB (Ref. see above).
NOTE: The breakout torque of the WTB must not be more than 0.5 m.N (4.4 lbf.in).
   (6) If the fault continues or no fault is found, do the detailed visual inspection of the transmission assembly, AMM 27-84-00-200-001.
   (7) If the fault continues: Remove each transmission shaft, one at a time to do a check for friction in each component of the slat system, (Ref. AMM chap. 27, removal and installation procedures).
     (a) If you find a fault, correct or repair as necessary. Refer to the AMM 27-8X-XX for the applicable repair, or removal and installation procedures.
     (b) Make sure that you install all components which were removed.
5. Close-up
Subtask 27-81-00-942-064-A
A. Remove the ground support and maintenance equipment, the special and standard tools and all other items.
Subtask 27-81-00-860-065-A
B. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:27:48 UTC
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