THE past two years have seen a notable increase in the number of services on aircraft for which some form of power is required. First, retractable undercarriages, followed by wing flaps, gun turrets, and automatic pilots, have demanded a light and compact source of power, capable of being transmitted to remote points on the machine. As suitable power units have become available, so have other applications presented themselves, with the consequent freeing of the pilot and crew from irksome manual effort.
Nixon, F. (1937), "Hydraulic Pumps for Aeroplanes: A Survey of the Types Available for the Operation of Auxiliary Services", Aircraft Engineering and Aerospace Technology, Vol. 9 No. 11, pp. 295-303. https://doi.org/10.1108/eb030242
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