A luggage container, moved by heavy winds, hit the engine of the Vistara aircraft early on Saturday. The aircraft was parked at the apron near international terminal. The containers belonged to Korean Airlines.
No one was hurt in the incident.
Airlines are required to lock containers and other ground equipment during storms to prevent mishaps. An aviation source said the Korean Air containers were not secured properly.
An Air India executive, however said the containers were secured and kept over a hundred metre away from the parking bay.
A Vistara spokesperson said the aircraft will be grounded for repairs, affecting its schedule.
Seventeen flights were diverted on Friday and others delayed by an hour because of the rain and low visibility. Eleven flights were cancelled
The area outside Terminal 1 was waterlogged and a leakage was reported from an overhead pipe in Terminal 2 on Friday night.
Mumbai International Airport, in a release, said the dislocation of the rainwater pipeline joint was because of heavy flow of rain water.
"It was addressed within no time and the required actions were taken to clear the water without disturbing the passengers," MIAL said.