A300
Maintenance Airframe; Maintenance Powerplant
Situational Awareness
Aircraft Equipment Problem Critical
Flight Crew Diverted; General Maintenance Action
Aircraft; Chart Or Publication; Human Factors; MEL; Manuals; Procedure
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.
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.