Mt Mynydd Perfedd | Bureau of Aircraft Accidents Archives

The crew was performing a flight from the RAF Llandwrog (Caernarfon Airport) and while cruising by night over the Snowdonia mountains, the twin engine aircraft hit the slope of Mt Mynydd Perfedd (812 meters high). The aircraft was destroyed by impact forces and all four occupants were killed.
Crew (9th AFU):
Sgt John George Shepherd, pilot,
Sgt Edwin John Keightley, wireless operator and air gunner,
LAC John Chrystal, navigator,
LAC John Thomas Key, navigator.
Source and photos:
http://www.peakdistrictaircrashes.co.uk/pages/wales/walesperfedd.htm

Probable cause:

The accident was caused by a navigation error on part of the pilot.

Crash of an Avro 652 Anson I on Mt Mynydd Perfedd: 4 killed

Date & Time: Oct 5, 1943 at 0015 LT

Type of aircraft:

Avro 652 Anson

Operator:

Registration:

LT184

Flight Phase:

Flight

Flight Type:

Training

Survivors:

Site:

Mountains

Schedule:

Bishops Court - Bishops Court

Location:

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Circumstances:

The crew left RAF Bishops Court for a night training exercise. While flying over the north of Wales by night and marginal weather conditions, the aircraft hit the east slope of Mt Mynydd Perfedd and was destroyed. All four crew members were killed.
Crew (7th AOS):
Sgt John George Shepherd, pilot,
Sgt Edwin John Keightley, wireless operator and air gunner,
LAC John Chrystal, navigator,
LAC John Thomas Key, navigator.

Probable cause:

The accident was caused by a navigational error as the aircraft was more than 30 km away from its initial track at the time of the accident.