H500 / D150, en-route, North of London UK, 2007

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	Not Recorded
Type of Flight	Private
Origin	Sleap
Intended Destination	Lashenden/Headcorn
Actual Destination	Lashenden/Headcorn
Take off Commenced	Yes
Flight Airborne	Yes
Flight Completed	Yes
Flight Phase	Cruise
	ENR

Flight Details
Aircraft	HUGHES 369
Operator	Not Recorded
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.	near Elstree, UK
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General
Tag(s)	Aircraft-aircraft near miss

HF
Tag(s)	Ineffective Monitoring

LOS
Tag(s)	See and Avoid Ineffective, Near Miss

Outcome
Damage or injury	No

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 ft15.24 m
.

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.

Related Articles

• Loss of Separation

Further Reading

• For further information, see the UK Airprox Board Report No. 148/07, pages 40 - 42 of bookshelf entry, which was one of a number of incidents assessed at the December 2007 Board.