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The pilot had experienced difficulty with securing the locker door on previous occasions as it could not be placed into a position that was flush with the fuselage. This created a potential for air flowing under the nose locker door to open it. Damage to the recovered components was not consistent with failure of the lock mechanism; however failure of the other lock may not be discounted. Given the difficulty in securing the nose locker door, it is likely that it had not been properly secured prior to the occurrence flight.

The main cabin door/locker door warning annunciator was continuously illuminated and was therefore no longer effective as a warning. Consequently, the operational safety intent of the original door warning system design had been negated by the engineering for the modified door.

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