Under a year later in August 1915, MacLean took up command of No. 8 Squadron and in 1916 he became the Commandant of the Central Flying School.
The Central Flying School is the longest serving flying school in the world beginning in Upavon, Wiltshire, England on 12 May 1912.
The next phase of his career was as a flying instructor, learning this role at the RAF Central Flying School in England.
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This had revised wing spars and a stronger fuselage and was powered by the uprated Jupiter VII F. One production aircraft was modified for use as an advanced trainer: after evaluation by the Central Flying School at Upavon this was ordered by the RAF, the production aircraft differing from the prototype in having slightly swept wings and an enlarged fin to improve spin recovery characteristics.
Back in the UK he was posted as a Staff Instructor at RAF's Central Flying School at Little Rissington where he trained instructors and flew Harvards, Balliols, Athenas, Meteors, Spitfires, Mosquitos and Lancasters.
The site was originally constructed around 1912 as a Royal Flying Corps (RFC) base, and became the home of the RFC Central Flying School on 19 June 1912, later to be the RAF Central Flying School upon formation of the Royal Air Force.
Shortly thereafter, Irwin was discharged from hospital and assigned to instructor duty at the Central Flying School in Upavon.
He was commissioned into the Royal Flying Corps (RFC) after the completion of his training in 1915 at the Central Flying School, Upavon.