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Analysis

Summary

The displaced circlip from the upper end on the accelerator pump plunger, discovered during the technical disassembly of the carburettor, would have resulted in insufficient fuel being available to the engine during rapid high power requirements.

The engine logbook documentation did not reveal any maintenance performed to the carburettor since it's last repair and reinstallation. It was unlikely that the circlip had become displaced during the repairs of the carburettor, as bench testing would have revealed the problem.

If the maintenance action of the reversing of the linkage plate had been carried out without removing the top plate of the carburettor, it would have been difficult to verify the continued connectivity of the accelerator linkage and the proper functioning of the accelerator pump mechanism within the carburettor.

The investigation could not conclusively establish the reason for the disconnection of the accelerator pump plunger mechanism.

 
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