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D150 / H500, London UK, 2007

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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
Actual or Potential
Event Type 		Human Factors, Loss of Separation
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
Take off Commenced Yes
Flight Airborne Yes
Flight Completed Yes
Flight Phase Cruise
ENR
Flight Details
Aircraft HUGHES 369
Operator Private
Type of Flight Private
Intended Destination White Waltham Airfield
Take off Commenced Yes
Flight Airborne Yes
Flight Completed Yes
Flight Phase Cruise
ENR
Location
Approx. Bricket Wood, UK
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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 None"None" is not in the list (Minor, Major, Hull loss) of allowed values for the "Aircraft damage" property.
Injuries None"None" is not in the list (Few occupants, Many occupants, Most or all occupants) of allowed values for the "Injuries" property.
Fatalities None"None" is not in the list (Few occupants, Many occupants, Most or all occupants) of allowed values for the "Fatalities" 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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