Air traffic control tower personnel noticed the left side of the engine emitting smoke abnormally and alerted the pilot, airport sources said. The smoke was detected in the Auxiliary Power Unit and engineers rectified the "very minor snag", Air India sources said.
The plane was towed to the aircraft base for inspection and the problem rectified following which it resumed its onward journey to Mumbai. None of the passengers and crew members were asked to disembark from the flight AI 687, the sources said.
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