I'm looking for some ideas about where the information contained on an AM Form 1833 might have been gathered from, or indeed any input regarding AM Form 1833's.

I have a copy of an AM Form 1833 which relates to the loss of an aircraft in Scotland. It was sent to The Secretary, Imperial War Graves Commission by Air Ministry C14 Cas in November 1948 with the heading "REPORT ON CRASHED OR EXPLODED AIRCRAFT PLAQUE CROSSES, MULTIPLE BURIALS - AMO 682/45"

The form has columns for Unit, Service No, Name & Initials, Rank, Name of Cemetery/Plot/Row/& Brief account of case.

Does anyone know the source(s) that would have been used to compile this form, in particular the details in the column that includes brief account of case?

Many thanks for any input.