The Mars landing was a high-profile gamble by NASA on a novel landing procedure.

WSJ: NASA's Curiosity Rover Lands on Mars

To overcome this, the board suggested firing the thrusters a few times at the start of the landing procedure to make certain they are operating uniformly.

ECONOMIST: Double, double, Hubble trouble

The decision was taken to return to Exeter using the "alternate landing gear extension" procedure.

BBC: Flybe plane passengers 'saw wheel fall off'