Air India probe puts early focus on pilots' actions and plane's fuel switches

In all, 260 people died in the 12 June crash, including all but one of the people onboard the aircraft

- Andrew Tangel, Shan Li & Krishna Pokharel

The investigation into last month's Air India crash is focusing on the actions of the jet's pilots and doesn't so far point to a problem with the Boeing 787 Dreamliner, according to people familiar with U.S. officials' early assessments.

Preliminary findings indicate that switches controlling fuel flow to the jet's two engines were turned off, leading to an apparent loss of thrust shortly after takeoff, the people said. Pilots use the switches to start the jet's engines, shut them down, or reset them in certain emergencies.

The switches would normally be on during flight, and it is unclear how or why they were turned off, these people said. The people also said it was unclear whether the move was accidental or intentional, or whether there was an attempt to turn them back on.

If the switches were off, that could explain why the jet's emergency-power generator—known as a ram air turbine, or RAT—appears to have activated in the moments before the aircraft plummeted into a nearby hostel for medical students. In all, 260 people died, including all but one of the people onboard the plane.

India's Aircraft Accident Investigation Bureau, which is leading the probe, is expected to issue a preliminary report as soon as Friday local time. It didn't respond to a request for comment on Thursday.