DAPT,
Is it not fairly clear to you that this pilot and crew most likely had no spare capacity to get a distress call out? Unlike the very safe and controlled environment of a training flight, this event even to a highly experienced commander as Dave Traill would have been terrifying and his utmost thoughts and capacity would've been the saving of his aircraft and crew. The fact the Mayday was omitted really portrays a situation far beyond comprehension. The crew of the Super Puma that shucked its head in the North Sea managed "Mayday oh fxxk" very apt for that situation!!
MF26