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Aviation History
1950
1950 - 1362.PDF
13 JULY 1950 HERCULES -1000 hours between overhauls 7 Circuits of the Globe The Hercules 634 engines used in Viking aircraft operated by Airwork Limited have now been approved by the Air Registration Board for 1,000 hours operation between overhauls. The previous approved life between overhauls was 900 hours and the extension to 1,000 hours is the result of operating a trial batch of engines for this longer period. "Bristol" sleeve-valve engines run for their full period between over- hauls without any attention apart from routine service maintenance of plugs, filters, etc. There is no top overhaul, and the full 1,000 hours is completed without removing or changing any cylinder heads or pistons. Flying for 1,000 hours is equivalent to 7 circuits of the globe, and in terms of a family car a 1,000 hour overhaul period would allow 30,000 miles of motoring without decarbonising or touching the engine in any other way than superficial maintenance. The excellent reliability and economy achieved in service by the Hercules engine has given the sleeve-valve engine a high reputation among civil operators, and once again proves the suitability of Hercules and Centaurus engines for transport type aircraft. THE AEROPLANE COMPANY L I M I T E D ENGLAND
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