The families of the victims Sue Boeing and Honeywell

Families of four passengers who died on an Air India plane that crashed in June filed a complaint in the United States against the plan of the plan of theMator and the manufacturer of plane coins Honeywell, accusing negligence companies.

The trial submitted Tuesday and seen by the BBC, said that defective fuel switches had caused the accident and accused companies of “nothing” despite their knowledge of the risk of the plane.

The flight 171 of Air India to London Gatwick, a Boeing 787, crashed shortly after the takeoff of Ahmedabad, killing 260 people.

Fuel switches have become an objective for investigators after a preliminary investigation found that the fuel of the engines was cut for a few moments after the plane left the floor.

The Federal Aviation Administration of the United States (FAA) said earlier than fuel control switches in Boeing aircraft were safe.

The BBC contacted Boeing and Honeywell for an answer.

The American aircraft manufacturer did not comment on the case. Instead, he highlighted the preliminary preliminary report of the India Airplane Accident Investigation Office (AAIB) on the accident.

The trial alleys that the two companies knew the risk of an accident because they developed and marketed the 787 Dreamliner and its components.

He quoted an opinion of the FAA in 2018 which urged – but did not have to inspect the locking mechanism of fuel switches to ensure that it could not be moved accidentally, thus reducing fuel food.

In the case of flight 171 of Air India, the switch was moved from “run” to the “cut” position, hampering the thrust of the plane, according to the AAIB preliminary investigation report.

Families said it was equivalent to a design “defect” which “inadvertently cut the fuel diet and a total loss of thrust necessary to propel” the plane.

They said, “And what Honeywell and Boeing did to prevent the inevitable disaster? Nothing.”

Companies have not warned the airlines that switches required an inspection and repair, and have not provided replacement parts to allow its customers to install them, according to the trial.

Boeing and Honeywell are “seated forever” behind a sweet advice which simply recommended to inspect the switches, have said families, who are represented by the Texas -based law firm.

A more detailed report of the accident was expected in 2026.

A total of 229 passengers, 12 cabin crew members and 19 people on the ground perished when the plane crashed.