Background
The helicopter, a single-engine SA341G Gazelle 1 (registration N123TY), was manufactured in 1975. The flight was private, with one pilot and three passengers on board. The pilot, aged 40, held a Private Pilot's Licence (Helicopters) and had 71 total flying hours, 31 of which were on type. His recent experience included 19 hours in the last 90 days and 4 hours in the last 28 days.
Intended Flight
The pilot planned to fly from a private landing site in Hartlepool to Weybridge, Surrey, with a refueling stop at Gamston. He obtained a meteorological forecast the day before, which predicted a cloudbase of 2,500 feet, lowering to 1,800 feet in showers. At 0314 hrs on the day of the accident, a METFORM 215 was issued for 0600-1200 hrs. It indicated a cold front west of Hartlepool moving east at 15 kt, with general visibility of 10 km in rain, cloudbase 1,000 feet occasionally falling to 500 feet, and isolated patches down to 200 feet east of the front. Lower cloudbases were accompanied by reduced visibility to 1,500 metres with cloud on hills. A meteorological aftercast confirmed good agreement between forecast and actual conditions at the accident time.
Flight and Accident
After takeoff, the pilot obtained a Flight Information Service from Teesside ATC and set heading for Gamston. Approaching the Cleveland Hills, he realized the cloudbase was lower than forecast. He informed Teesside of his intention to route further west through a gap in the hills. When approaching the gap, he observed even lower cloud and advised Teesside he would return to Hartlepool. The pilot then commenced a right turn away from high ground, during which he entered cloud and lost sight of the ground. The ATC controller reported the pilot transmitted he was "850 feet on instruments." Having entered cloud, the pilot commenced a descent and regained visual contact with the ground at about 50 feet. Despite flaring the aircraft and applying power, he was unable to prevent impact with the ground. The helicopter was severely damaged by the impact, but the pilot and three passengers evacuated with only minor injuries.
Aftermath
The accident was investigated by the AAIB, with information sourced from the pilot's Aircraft Accident Report Form. No probable cause is stated in the report.