This is the second Indian airline to make a landing in Karachi in two weeks.
Lack of fuel resulted in a airplane in Anchorage in the US having to make an emergency landing.
The Army helicopter was flying from Bathinda in Punjab to Delhi
There were nine people in the helicopter, including two pilots. It crashed 50 nautical miles from the Mumbai coast.
The pilots of the A320neo plane received a warning about high exhaust gas temperatures on one of the engines just minutes after the aircraft's departure from the Chhatrapati Shivaji International Airport.
According to the Indian Navy, the aircraft had declared an emergency due to the shutdown of the left engine.
Brazil star Neymar was on holiday in the United States with his girlfriend, Bruno Biancardi, and sister Rafaella Santos.
The plane, which was carrying 126 passengers to the Bangladesh capital from Muscat, had made an emergency landing in Nagpur around 11.40 am on Friday as the pilot suffered a heart attack mid-air.