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Just before the outbreak of World War II I had been sent to RAF Cosford as a technical instructor. When war broke out I was posted to Blackpool to help with the trade training of the many recruits who received their trade instruction in the town's multi‐storey car park. My phase of instruction was to teach the basic principles of hydraulics, and to specialise in specific aircraft hydraulic systems. Sectioned display items were made of the various pumps, control valves, cut‐off valves, hydraulic jacks, etc. Complete aircraft systems were removed from written‐off aircraft and laid out on benches, so that the trainee could manually work the pumps to operate the various hydraulic jacks that raised the undercarriage or operated the flaps.