http://www.youplay.it/play/bm_GameMove.asp?GameID=225655

The rules state:
Fire: The aircraft’s engine is on fire. Place a fire marker on the plane. A player whose aircraft is on fire may not tail, shoot his guns, or perform restricted maneuvers. See Fire Damage and Extinguishing Fire/Smoke for further information.

However:
20. Tower damaged by fire.
20. Tower fired at HeadMMoid, distance 1 with deflection. 7 points. Damage RR (Base:7,Stb:+2,1Gun:-2,Defl:-1,Long:+1,Dice:+6).
19. Tower damaged by fire.