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D150 / H500, London UK, 2007 (LOS HF)

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Summary
On 5 October 2007, a loss of separation occurred between a Hughes 369 helicopter and a Jodel D150. The incident occurred outside controlled airspace, in VMC, and the estimated vertical separation as the Jodel took avoiding action by descending, was assessed by both pilots to be less than 50 feet.
Event Details
When October 2007
Event Type HF, LOS
Day/Night Day
Flight Conditions VMC
Flight Details
Aircraft JODEL D-150 Mascaret
Operator Private
Type of Flight Private
Origin Sleap
Intended Destination Lashenden/Headcorn
Flight Phase Cruise
ENR
Flight Details
Aircraft HUGHES 369
Operator Private
Type of Flight Private
Intended Destination White Waltham
Flight Phase Cruise
ENR
Location
Approx. Bricket Wood, UK
Loading map...
General
Tag(s) Aircraft-aircraft near miss
HF
Tag(s) Distraction
Ineffective Monitoring
LOS
Tag(s) See and Avoid Ineffective
Released to Own Separation
Near Miss
Outcome
Damage or injury No
Aircraft damage Nonewarning.png"None" is not in the list of possible values (Minor, Major, Hull loss) for this property.
Injuries Nonewarning.png"None" is not in the list of possible values (Few occupants, Many occupants, Most or all occupants) for this property.
Fatalities Nonewarning.png"None" is not in the list of possible values (Few occupants, Many occupants, Most or all occupants) for this property.
Causal Factor Group(s)
Group(s) Aircraft Operation
Safety Recommendation(s)
Group(s) None Made
Investigation Type
Type Independent

Description

On 5 October 2007, a loss of separation occurred between a Hughes 369 helicopter and a Jodel D150. The incident occurred outside controlled airspace, in VMC, and the estimated vertical separation as the Jodel took avoiding action by descending, was assessed by both pilots to be less than 50 feet.

The helicopter pilot's workload at the time of the incident was high as a result of frequency and transponder changes, and he did not notice the Jodel until it passed under his aircraft.

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