IT is probably true to say that the opinion most widely held about aircraft accessory power systems is that they are a necessary evil about which nothing very much can be done. This attitude is induced in practice by the following facts: (i) most aircraft will not operate satisfactorily without an accessory power system; (ii) the accessory power system is normally only re‐sponsible for a very small proportion of the major failures of the aircraft and is, in any case, only an accessory and not fundamental to the design of the machine; (iii) more maintenance hours are spent putting the accessory power system right than on almost anything else.
Rendel, D.G.A. (1946), "Fluid Power Transmission in Aeroplanes: Some Notes on the Fundamental Principles to be Borne in Mind in Choosing Accessory Systems", Aircraft Engineering and Aerospace Technology, Vol. 18 No. 7, pp. 237-241. https://doi.org/10.1108/eb031392
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