Argosy

I think that this aircraft is an Argosy. We were told that it was used for "navigational purposes"

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The Argosy was a variant of the civil AW650 freight aircraft. The RAF ordered fifty-six Argosies for use as medium range transport, paratroop and supply aircraft. The prototype flew on 4 March 1961, and the RAF took delivery of its first aircraft in 1962.
The military Argosy could accommodate either 69 troops, 48 stretcher cases or 13154kg (29000lbs) of freight. The freight load could include a Saracen Armoured Car, 105mm Howitzer, Wombat anti-tank gun and Ferret Scout car. Its freight capacity was half that of the C-130
I think that the contraption on the ground to the left of the aeroplane in the photograph is a radar scanner and it is alleged that a ZB298 operator, so convinced that it was insurgents, persuaded someone with a GPMG to open fire on the rotating antenna...
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RAF Salalah