Mt Foel Grach

The crew were on a night cross country navigation exercise from their home base of Jurby, on the northern plain of the Isle of Man. Most routes flown from Jurby were circular tours of the Irish Sea. While flying west, presumably on a clockwise orbit of the Irish Sea, the aircraft flew into to gentle grassy slopes of the Carneddau. At about 12:30 on the 1st December the RAF Mountain Rescue team based at Llandwrog were informed by the station's Flying Control Officer that two of the aircraft's crew had walked down to Bethesda, after having spent the night in the aircraft. The MRT began their search from Bethesda police station, they were then directed to the village store where they found the two aircrew. The two crew were unable to avail the team members of the exact location of the aircraft, having walked down in low visibility. They then began a search of the area to the north and west of Carnedd Llewellyn but found nothing before sunset, when they had to abandon the search and return to base. The second day of the search started at 07:30 with the team searching around Carnedd Dafydd. At 11:00 a third member of the crew was reported as having walked off the mountain to Bethesda. He was able to inform the Police more about where the aircraft, and the now lone fourth crewman was located. The hill parties were recalled and then drove to Tal-y-bont before proceeding up the track to Melynllyn to search the mountains in that area. At about 15:30 one of the search parties came across the wreck in the area between Foel Grach and Garnedd Uchaf and the cliffs of Craig y Dulyn. The fourth crew member was found alive in the aircraft's turret. He was reported to be "suffering from dehydration, starvation and a fractured foot, but his spirits were high". He was recovered by a stretcher party, arriving at the Ambulance after nightfall.
Crew (5th AOS):
Sgt James A. Knight, pilot,
Sgt Roy Gilbert, wireless operator and air gunner,
LAC Reed, navigator,
LAC Thomson, navigator.
Source:
http://www.peakdistrictaircrashes.co.uk/pages/wales/walesef909.htm

While performing a night training mission from RAF Hixon, the aircraft hit the slope of Mt Foel Grach, southeast of Bangor, north of Wales. All five crew members were killed.
Crew (30th OTU):
Sgt Edward Gerrard Frezell, pilot,
P/O Frederick Keith Thorogood, navigator,
Sgt Cecil Gordon Bennett, bomb aimer,
Sgt George Newton Rafferty, wireless operator,
Sgt Edwin Towler, air gunner.

The crew of the aircraft were on a night navigation training exercise from RAF Llandwrog near to Caernarfon, while on the return leg from Shrewsbury at 2100LT the aircraft struck the southern side of Foel Grach. All of the crew survived the initial impact though three of them were seriously injured and were unable to leave the wrecked aircraft. Pilot Officer Archer, being the least injured, was the only man able to walk out for help. Rescuers arrived on site on January 16 around 1000LT. Sgt Brocklehurst was found lying across the navigator's table, apparently as though he had fallen asleep there and died, Sgt Barnett was in the co-pilot's seat and was also found to be dead. Sgt Paterson was alive and reported to be warm.
Crew (9th AFU):
P/O Kenneth Archer, pilot,
Sgt Eric Thomas Brocklehurst, wireless operator and air gunner, †
Sgt William Henry Barnett, navigator, †
Sgt Frank Paterson, navigator.
Source:
http://www.peakdistrictaircrashes.co.uk/pages/wales/waleseg110.htm