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Aviation History
1950
1950 - 1402.PDF
20 JULY 1950 HERCULES ENGINES hours between overhauls The Hercules 634 engines used in Viking aircraft operated by Airwork -: : Limited have now been approved by the Air Registration Board for 1000 hours operation I between overhauls. "jr The previous approved life between overhauls was 900 hours and the extension to 1000 hours vV is the result of operating a trial batch of engines for this longer period. "Bristol" sleeve-valve -'.~x -:-"'k engines run for their full period between overhauls without any attention apart from routine %•. V^.-- service maintenance of plugs, filters, etc. There is no top overhaul, and the full 1000 hours /;;•• is completed without removing or changing any cylinder heads or pistons. „ r A notable feature of the steady improvement in overhaul life of these engines is . the high proportion of the maximum permissible overhaul life that is achieved. f Some operators have reached a figure as high as 97% and the average of all operators is about 91%. All engine changes, irrespective of the reason, are included in these figures. 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 i,000 hour* between overhauls — 1^, »j«jft«fti«l«?tt< it, more than —---r- 7\ flights rotntfl the world AEROPLANE COMPANY LIMITE ENGLAND
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