No. 8 of the year 1930. The attention of aircraft owners and ground engineers is drawn to the pins in connecting rod between control sticks for aileron control of the Blackburn “Bluebird” Mark IV aircraft, which are not to exceed 0470 in. in length under the head.
(1930), "Air Ministry Announcements: Official Notices of Importance to Aircraft Owners and Ground Engineers Issued during April and May", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 6, pp. 154-154. https://doi.org/10.1108/eb029279
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