No. 14 of the year 1934. Owing to rapid wear of the old pattern valve‐rocker adjusting screw, Part No. 822, on Pobjoy “R” type engines, there is a danger of the valve clearance increasing sufficiently during flight to allow the rocker to foul the valve‐spring cap. New type screws, Part No. 822/1, which are harder and have the striking pad thickened up, must, therefore, be fitted not later than the next top overhaul.
(1934), "Air Ministry Official Notices: Instructions to Aeroplane Owners and Ground Engineers on Essential Modifications", Aircraft Engineering and Aerospace Technology, Vol. 6 No. 8, pp. 227-227. https://doi.org/10.1108/eb029837
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