The tender was promptly on the scene but the abnormally severe weather had resulted in the freezing of the water in the main water control valve preventing the production of the necessary foam. The carbon dioxide equipment, however, was immediately brought into use. The engine and the foam pump motor were run up and the pump itself turned by hand at hourly intervals and were serviceable at the time of the accident. In view of the regular test running it is not the practice to have the engine ticking over during landings and take-offs.