Russia: Unreleased parking brake cause behind Yak-42 crash:

Driving away without releasing the handbrake of the car is popularly known as the blonde's error', a similar thing happened while Yak-42 was taking off from the Tunoshna airport on September 7 near Yaroslavl about 300 north-west from here, 'Moskovsky Komsomolets' daily reported.

"The commander of the Yak-42 was feeling unwell so he told co-pilot to take-off. But in any case it was the commander's job to release parking brakes. The crew realised during the takeoff run and released the parking brakes, but it was too late for the plane to lift off," the daily reported quoting a 'source close to probe'.

For more: 'Blonde's error' cause behind Yak-42 crash: Report - Hindustan Times