"Among the crew’s terse, unemotional remarks was a brief speculation that something, possibly connected with the military area, had hit the horizontal stabiliser and engines. By this time the fire alarm had ceased and the crew presumed the fire had gone out. The engineer reported only one of the aircraft’s four generators was operational. In response, the captain switched off the radar to save power."
January 1, 1970
https://en.wikiquote.org/wiki/LOT_Polish_Airlines_Flight_5055