In video pilot says plane is `` secure , '' and that it 's dumping fuel . Meg Graham said she heard a loud bang within minutes of the plane departing . " The pilots are not saying they're going to dump the fuel. Sound on tape indicates pilot 's explanation did n't cause alarm . Qantas grounded its planes for as long as it takes to perform investigation , official says .
In video pilot says plane is `` secure , '' and that it 's dumping fuel . " The pilots are not saying they're going to dump the fuel. Sound on tape indicates pilot 's explanation did n't cause alarm . Qantas grounded its planes for as long as it takes to perform investigation , official says .