No. 33 of the year 1931. Several engine failures have been caused by the carburettor float mechanism breaking down, due to failure of the locking wire in the needle valve toggle pins.
(1931), "Air Ministry Official Notices: Instructions to Aircraft Owners and Ground Engineers Regarding Essential Modifications", Aircraft Engineering and Aerospace Technology, Vol. 3 No. 9, pp. 230-230. https://doi.org/10.1108/eb029451
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