Brazilian investigators of the Amazon mid-air collision between a Gol Boeing 737 and an Embraer Legacy business jet have directly interviewed the Legacy’s pilots for the first time, but have still to determine why the jet’s transponder deactivated with the loss of the collision-warning system.

Both Legacy pilots have denied deliberately carrying out any action which would have switched off the transponder and do not recall doing anything which might have accidentally caused it to stop operating.

Last year the US FAA warned that Legacy pilots could accidentally nudge the radio management unit – which also controls the transponder – while using the cockpit footrest.

But Brazilian accident investigation agency CENIPA has not publicly linked this possible me

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