IT has long been the aim of aero‐engine designers to reduce the number of external pipes and this has been accomplished to some degree by the introduction of internal oil and coolant passages. But for all that, there are still a considerable number of pipes attached to the outside of most aero‐engines and it will be obvious that the correct maintenance of these is of paramount importance.
Tomlinson, J.W. (1949), "The Maintenance of Aero‐Engine Pipes: Notes on the Cleaning, Inspection and Repair of Metal and Flexible Pipes", Aircraft Engineering and Aerospace Technology, Vol. 21 No. 12, pp. 386-387. https://doi.org/10.1108/eb031840
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