the engine would fail. We tried not to operate the aircraft below -40 C degrees. Wardair used to shut down the
fl ying operation at very cold outside air temperatures as it was too hard to keep the engine temps normal. In fact, if you ran into cold air aloft and you had to descend you had to keep power on as the cylinder head temps would get too cold. I believe the aircraft was designed for hot weather operation. We continued with the oil dilution in the summer time as well but for shorter periods of time. The gasoline mixed with the oil used to keep the internal parts clean and without sludge. The Bristol Hercules 734 Engine was tough, but I don’t think it would continue operating with a cylinder missing. We had many engine failures and often the cause was the sleeve valve crank breaking and dropping into the crankcase. There it would bounce around and destroy the engine internally within seconds. Wardair modifi ed the aircraft using C-130 Hercules tires. The large footprint of the tires allowed the aircraft to be landed on the tundra, summer and winter. This modifi cation worked well but added a little more drag. This enabled us to land at the North Pole.”
THE DEMISE OF THE BRISTOL By the late 1970s, when the Bristols were nearing the end of their operating life, spare parts were hard to obtain, and it became necessary to fabricate many items locally. The only remaining place to get an engine overhauled was in New Zealand so the engines had to be shipped half way around the world. Eventually, it simply became uneconomic to keep the Bristol freighters fl ying and as the engines came to the end of their TBO, the aircraft were retired.
Many of us were sorry to see them go as they left a gap that has yet to be fi lled. Sadly, the last remaining Wardair Bristol crashed shortly before reaching its planned retirement. It was carrying a load of corrugated steel plates out of Hay River, Alberta. As
power was applied during take-off , the whole stack of plates slipped to the tail of the aircraft, which reared nose up and stalled. For the staff of Wardair, it was a sad end to a proud chapter of Canadian aviation history. It was determined to be pilot error;
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