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North west aspect. Aircraft hangar, one of a group of three paired aircraft storage sheds built in 1917, by the War Office's Directorate of Fortifications and Works. The opening ends have 'Essavian' sliding/folding doors with diagonal timber running to an overhead track with a deep apron above running the full width of the double shed, to compact brick pylons at each end. Building 84 has, at the central valley to the W end, a steel access ladder to a signals (neon beacon) platform erected 1931 in brick with flat concrete roof slab, and simple pipe handrails, rising approx 4m from the valley. The long flanks have raking buttresses carried up to the eaves soffit, with half-brick curtain walls between. (Photo Oct 2012)