W DOC AIRBUS | TSM A320F

Flap Shaft Overspeed

TASK 27-51-00-810-840-A
Flap Shaft Overspeed

1. Possible Causes
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
Torque wrench: range to between 0.44 and 0.36 m.daN (38.94 and 31.86 lbf.in ) T
No specific
Torque wrench: range to between 0.66 and 0.54 m.daN (58.41 and 47.79 lbf.in ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
No specific
Titanine JC5A
 C. Referenced Information
REFERENCE
DESIGNATION
AMM 12-22-27-640-004
Lubricate all Carriage Rollers on all Flap Tracks
AMM 27-50-00-866-008
Extension of the Flaps on the Ground
AMM 27-50-00-866-009
Retraction of the Flaps on the Ground
AMM 27-50-00-866-010
Reset of the Torque Limiters of the Flap System on the Ground
AMM 27-50-00-869-006
Reset of the Wing Tip Brake (WTB) of the Flap System on the Ground
AMM 27-51-51-000-001
Removal of the Flap Wing-Tip Brake
AMM 27-51-51-400-001
Installation of the Flap Wing-Tip Brake
AMM 27-54-00-200-001
Detailed Visual Inspection of the Transmission Assembly
AMM 27-54-00-710-001
Operational Test of the Flap System
AMM 27-54-49-000-001
Removal of the Flap Track 1 Actuator
AMM 27-54-49-000-002
Removal of the Flap Track 2 Actuator
AMM 27-54-49-000-003
Removal of the Flap Track 3 Actuator
AMM 27-54-49-000-004
Removal of the Flap Track 4 Actuator
AMM 27-54-49-400-001
Installation of the Flap Track 1 Actuator
AMM 27-54-49-400-002
Installation of the Flap Track 2 Actuator
AMM 27-54-49-400-003
Installation of the Flap Track 3 Actuator
AMM 27-54-49-400-004
Installation of the Flap Track 4 Actuator
F Inspection Plug Location
3. Fault Confirmation
Subtask 27-51-00-710-070-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 27-51-00-810-090-A
A. Procedure
   (1) Do the wing tip brake (WTB) reset procedure,
but do not reset the torque limiter(s) at this time AMM 27-50-00-869-006.
   (2) Do the operational test of the flap system AMM 27-54-00-710-001.
     (a) If a FLAPS LOCKED is triggered:
  • Go to the FLAP System Status of SFCC 1 or 2.
  • Make sure if a FLAP TRANSMISSION RUNAWAY or ASYMMETRY is shown.
  • 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 flap transmission system , AMM 27-54-00-200-001. Repair or correct any defect found.
     (a) After the repair/replacement:
  • Do the reset of the torque limiter(s) AMM 27-50-00-866-010.
  • Do the operational test of the flap system AMM 27-54-00-710-001.
  • Make sure that the flap system is serviceable and make sure that there are no fault messages.
   (4) Do the reset of the torque limiters AMM 27-50-00-866-010 and record a possibly tripped torque limiter.
     (a) If a tripped torque limiter was found:
Examine the related drive station, AMM 27-54-00-200-001. If necessary lubricate the items which were before cleaned for inspection, AMM 12-22-27-640-004.
NOTE: At this drive station (where the tripped torque limiter was found):
The failure will be downstream of the output shaft of the rotary actuator.
So it will be necessary to inspect all the mechanical items (Track beam, carriage and flap actuator lever etc.).
       1 Do a detailed visual inspection of all the mechanical items (see NOTE above).
       2 If you find a fault, correct or repair as necessary. Refer to AMM 27-5X-XX for the applicable repair, or removal and installation procedures.
       3 If you find no fault, replace the rotary actuators which have a tripped torque limiter.
   (5) If no tripped torque limiter was found, examine the flap actuator assemblies on the identified wing:
F Inspection Plug Location
     (a) Remove the inspection plugs (1) and (2) on each actuator, clear the grease in the inspection holes and examine for water.
     (b) Install the inspection plugs (1) and (2) into the actuators:
     (c) If water is found, replace the defective rotary actuator as follows:
     (d) If no water is found, move the flaps, AMM 27-50-00-866-008 and AMM 27-50-00-866-009.
     (e) While the flaps move, do a check for incorrect noise at the WTB.
     (f) If there is an incorrect noise at the WTB, replace the WING TIP BRAKE [33CV] or WING TIP BRAKE [34CV] ,
AMM 27-51-51-000-001 and AMM 27-51-51-400-001.
     (g) If there is no incorrect noise at the WTB, disconnect the transmission shafts on each side of the WTB (Ref. see above).
     (h) Make sure that the WTB is easily turned, if it is not easily turned, replace the WTB (Ref. see above).
NOTE: The breakout torque of the WTB must not be more than 0.5 NM.
   (6) If the fault continues or no fault is found, do the detailed visual inspection of the transmission assembly, AMM 27-54-00-200-001.
   (7) If the fault continues:
Remove each transmission shaft, one at a time to do a check for friction in each in each component of the flap system, (Ref. AMM chap. 27, removal and installation procedures).
     (a) If you find a fault, correct or repair as necessary. Refer to the AMM 27-5X-XX for the applicable repair, or removal and installation procedures.
     (b) Make sure that you install all components which were removed.
[Rev.8 from Aug 2018] 2026.04.04 04:27:39 UTC
"WTRUIB" 2025