32-year-old K Sri Devi's husband S Puspanathan, then a governance specialist, was among the 239 passengers including five Indians and crew on board the Beijing-bound Boeing 777 aircraft.
Devi, who is a housewife, filed the 32 million Malaysian Ringgit (USD 7.6 million) negligence suit before the Kuala Lumpur High Court by her lawyer Shailender Bhar.
In the lawsuit, Devi along with her two young sons and parents-in-law have alleged wrongful death of Puspanathan due to alleged negligence and breach of contract by the airline and government agencies.
The aircraft left Kuala Lumpur International Airport (KLIA) in the wee hours of March 8, 2014 for Beijing and was declared as having "ended in the Southern Indian Ocean and all lives lost".
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Apart from a wing part called flaperon, no other part of the plane has been found so far despite a massive search operation in the Indian Ocean.
Included in the suit as plaintiffs are the couple's children Haresh Varmer, 5, and Thashvarmen, 3, and Puspanathan's parents, G Subramaniam and A Amirathan.
He said the thrust of the suit was that the owner of the aircraft was negligent in causing the aircraft to go missing.
He added that the Civil Aviation and Immigration departments were also in breach of their statutory duties.
The plaintiffs are seeking damages for, among others, loss of support, nervous shock and bereavement.
Bhar said his clients had written to the Royal Malaysian Air Force, Civil Aviation and Immigration departments for clarification but none was forthcoming.