A Valiant did a wheels up on Manston's foam runway back in the sixties. One of the mainwheels wouldn't go down so they went through the procedure and selected emergency lowering on the wheel that wouldn't go down. On the Valiant you could select either wheel and the system would blow the outer door lock and the door would open followed by the undercarriage being lowered with the emergency actuators.
That didn't work so they cleaned up and carried out a belly landing.
At the wash up they found that the individual emergency undercarriage lowering circuits had been cross wired since manufacture. They didn't hear the bang on the wrong side.