Donegal

Crew was engaged in a maritime patrol flight and left RAF Pembroke Dock in the afternoon for a 13 hours mission. Aircraft was scheduled to overfly the Lake Lough Erne but for unknown reason, was off the initial track and was flying over a mountainous area in the Donegal County. By night, the four engine aircraft hit the slope of Mt Blue Stak at a height of 2,219 feet. Rescuers arrived on site, some 200 feet from the top, and were able to evacuate six injured crew members while all seven other occupants were killed.
Crew:
Lieutenant Howard Charles Sheffield Armstrong, pilot, †
Lieutenant Maurice Leonard Gillingham, pilot, †
Maurice Vincent Wareing, copilot, †
Joseph George Trull, navigator,
John Bruce Richardson, flight engineer,
Sergeant C. S. Hobbs, air gunner,
Sergeant Cyril Robinson Greenwood, †
Sergeant Frederick George Green, gunner, †
Sergeant John Ernest Parsons, †
Sergeant Frederick Tom Copp, flight engineer, †
Sergeant James Kenneth Gilchrist, rear gunner,
Sergeant A. Gowens.

The crew was engaged in a convoy escort mission when he encountered engine problems. The captain informed ground he was attempting to return to RAF Enniskillen when the seaplane crashed into the sea off Donegal. Due to rough sea, SAR operations were abandoned few days later and no trace of the aircraft nor the crew was found.
Crew (423rd Squadron):
F/Lt A. F. Brazenor,
F/Sgt S. G. Brockway,
F/Sgt R. J. Money,
Sgt H. W. Fell,
Sgt H. E. E. Attwood,
Sgt M. F. Flynn,
Sgt D. Bigmore,
Sgt L. Morgan,
F/Sgt R. W. Stiff,
P/O R. H. Wilson
F/O H. B. Pharis.

The crew was performing a training mission off Donegal, Ireland. In flight, the float plane exploded and crashed into the sea. All nine occupants were killed.
Crew:
Sgt Peter Phillip Bacon,
Sgt Cyril Barraclough,
F/O Douglas Haig Disney,
F/O Kenneth Hipwell,
Sgt James Male,
F/Lt Edward Earle Muffitt,
Sgt Charles Edward Poots,
Sgt Harold Edwin Scarman,
Sgt Albert Upton.

The crew left RAF Ballykelly at 0533LT on a maritime patrol flight over the Atlantic Ocean. After the German U-boat U-256 was attacked and sank to a depth of 110 metres, the crew was requested to take part to a SAR operation for a troopship reported to have been torpedoed. At 1220LT, the crew informed ground that he was returning to his base with an ETA at 1627LT. At 1515LT, all four engine lost power, the aircraft lost height and was ditched off the Irish coast. While the aircraft sank and was lost, four crew members were rescued while four others were killed.
Crew:
P/O Victor Dennis James, pilot, †
Sgt Hector Vivian Frances Archer, copilot,
F/Sgt Alfred Burton Craig, navigator, †
Sgt Seymour Clare, flight engineer, †
F/Sgt Kenneth Henry Watson, wireless operator and air gunner, †
Sgt Peter Francis George, wireless operator and air gunner,
Sgt William Charles Gordon, wireless operator and air gunner,
Sgt Fredrick Norman Hollies, wireless operator and air gunner.

Sincere thanks to Peter Clare, son of Sgt Seymour Clare, for his testimony and contribution. All texts below by Peter Clare:
http://www.ww2irishaviation.com/lv341.htm
http://www.bbc.co.uk/history/ww2peopleswar/stories/98/a2600498.shtml

The floatplane departed Enniskillen on a maritime patrol flight. In unknown circumstances, it crashed into the Atlantic Ocean off Donegal. The wreckage was found but no trace of the 12 crew members.
Crew (201st Squadron):
F/Lt Francis Wilfred Smith,
P/O John Percival Bartlett,
F/O Rodney Wyben Smith,
F/O Henry Kitchin,
F/Sgt Harold Stanislaus Mason,
F/Sgt Norman Clare,
F/Sgt John Frederick Charles Smith,
Sgt Arnold Alfred Rolfe,
Sgt Hugh Jones,
Sgt Kenneth Charles Nutt,
Sgt Gordon Walter Eric Jacobson,
LAC Eric Hopkinson.