Aeronaves de Mexico Flight 401Thursday January 19, 1961
An aborted takeoff caused the aircraft to crash through the airport barrier fence and burst into flames. The unnecessary discontinuance of the takeoff as a result of actions by the check-pilot who was either not in the pilot's seat or reached forward without warning and pulling the throttles back. This action caused power to be decreased on all four engines. Contributing factors were the marginally poor weather, snow on the runway and the possibility of the pitot head heat not being on.