No. 4 of the year 1935 Whenever diaphragm type fuel pumps are dismantled, a very close inspection of the diaphragms should be effected, and if signs of deterioration are present the diaphragms should be renewed.
(1935), "Air Ministry Official Notices: Instructions to Aeroplane Owners and Ground Engineers on Essential Modifications", Aircraft Engineering and Aerospace Technology, Vol. 7 No. 3, pp. 74-74. https://doi.org/10.1108/eb029916
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