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A line mechanic reports an A300 aircraft diverted when the right-hand krueger/notch flap had deployed in flight. He had previously deferred the krueger/notch flap after performing the maintenance procedures called out in MEL 27-88-02. Trapped hydraulic fluid bleed-off suspected.
| Attributes | |
| ACN | 1081200 |
| Time | |
| Date | 201301 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Flap/Slat Control System |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Aircraft arrived [at the airport] on second shift and during postflight walkaround it was noted that the right-hand krueger/notch flap was leaking. Mechanic Y and myself determined that the aircraft could be dispatched by applying MEL 27-88-02. After reviewing the MEL; mechanic Y applied the maintenance procedures and I performed the rii function due to the item affecting a flight control and the complexity of the MEL procedures. After lockout of the noted flight control; I believe the trapped hydraulic fluid bleed off allowed the krueger/notch flap to slowly deploy in flight which caused the [flight] diversion.the MEL currently has you verify the flight control remains retracted by observing it for 10-minutes. This time could be lengthened due to the possibility of a very slow bleed off of fluid. Deferral of krueger/notch flap system.
Original NASA ASRS Text
Title: A Line Mechanic reports an A300 aircraft diverted when the right-hand Krueger/Notch Flap had deployed in flight. He had previously deferred the Krueger/Notch Flap after performing the Maintenance Procedures called out in MEL 27-88-02. Trapped hydraulic fluid bleed-off suspected.
Narrative: Aircraft arrived [at the airport] on Second Shift and during postflight walkaround it was noted that the right-hand Krueger/Notch Flap was leaking. Mechanic Y and myself determined that the aircraft could be dispatched by applying MEL 27-88-02. After reviewing the MEL; Mechanic Y applied the Maintenance Procedures and I performed the RII function due to the item affecting a flight control and the complexity of the MEL procedures. After lockout of the noted flight control; I believe the trapped hydraulic fluid bleed off allowed the Krueger/Notch Flap to slowly deploy in flight which caused the [flight] diversion.The MEL currently has you verify the flight control remains retracted by observing it for 10-minutes. This time could be lengthened due to the possibility of a very slow bleed off of fluid. Deferral of Krueger/Notch Flap System.
Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.