These could be red herrings, but;
Harvard II 2646 from Macdonald Category 'A' accident 16th July 1953
and
33654 F/O Allan Barton MacGregor RCAF of 1 AGS killed Langruth Range (North of Macdonald) same date.
Maybe not connected with your man but may just open new avenues of enquiry.
Ian Macdonald
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