1974 Norfolk mid-air collision. The 1974 Norfolk mid-air collision happened on 9 August 1974 at Fordham Fen, Norfolk, England when a Royal Air Force McDonnell-Douglas F-4M Phantom FGR.2 of No. 41 Squadron RAF (41 Sqn) collided with a Piper PA-25-235 Pawnee crop spraying aircraft. All three aviators were killed: the pilot and navigator of the Phantom and the pilot of the Pawnee. The Phantom pilot was a Royal Air Force Group Captain and station commander of RAF Coningsby. It was the first collision between a civil aircraft and a military fast jet in the United Kingdom low flying military training system.

Aircraft
The Pawnee registered G-ASVX was a single-engined single-seat crop spraying aircraft built in 1974. The Phantom serial number XV493 was a twin-engined two-seat, all-weather military strike/interceptor aircraft.

Background
The RAF pilot, David Robert Kidgell Blucke, was born on 28 November 1931, and attended Malvern College. He joined the RAF in 1950, and had been on exchanges in Canada, flying the F-101. Around 1966 he had commanded 11 Sqn flying English Electric Lightnings from RAF Leuchars. He was promoted to Group Captain in January 1972 and moved to Coningsby in August 1972.

The RAF navigator, Terence Wesley Kirkland, had attended Foyle College.

Accident
The Pawnee had departed earlier on 9 August 1974 from Southend Airport to a disused airfield, formerly RAF Downham Market, situated near Broomhill and Bexwell, in Norfolk. This location was used as a temporary base to refuel the aircraft and to load pesticide. At about 14:04 the aircraft had finished spraying a field  south of Downham Market and was returning to replenish the pesticide hopper. The sprayer was of ADS Aerials of Southend, with pilot Paul Hickmott, aged 24. He had taken off from the airfield near Bexwell, taking off at 14:30, due to land at 15:10.

The Phantom departed RAF Coningsby at 13:51 to fly a low-level navigation and reconnaissance flight at no lower than  above ground level. The Phantom was following a standard low-flying route; the Pawnee pilot was aware that military low-flying routes were in the area, but the exact routing was classified and not released by the military. About 14:08 about  west of the village of Hilgay, and at an estimated height of around  the Phantom, flying at a speed of about , struck the Pawnee on its right side. The Pawnee disintegrated, while the Phantom, on fire and shedding parts of its structure, continued on its heading for a further  before it hit the ground inverted. All three aviators were killed: the pilot and navigator of the Phantom and the pilot of the Pawnee. All flying was stopped at Coningsby for the day.

Investigation
Both aircraft were found to have been maintained correctly and were legally authorized for the flights. Farmwork Services, who had chartered the Pawnee, had informed the local police authority about their proposed operation and the type of chemical to be used. Nothing in the regulations required them to inform the military, although Farmwork Services had, as usual, informed nearby RAF Marham (an operational airfield about  from the accident) that they would be spraying an extensive area of Norfolk between June and August 1974.

Investigation of the wreckage failed to determine if either had a working anti-collision light, and it was only possible to determine the height of the accident from eyewitness accounts. The collision occurred in good visibility at an estimated height above ground level of . The investigation could find no evidence to suggest that either of the pilots had a medical problem or that either aircraft had any defect that would have contributed to the accident.

The rules of the air state that the Pawnee should have given way to the Phantom which was closing from the right. But it was accepted that at a closing speed of about  the time needed by the Pawnee pilot to assess the situation and execute a manoeuvre was minimal. It was also a requirement of the Phantom pilot to make sure that he did not collide with the Pawnee, but clearly in this accident the lack of time was an element. Also the military aircraft had only just turned onto the heading, and with the Pawnee 15° to his left the view may well have been obstructed by the Phantom's canopy frame.

While it accepted the need for the Royal Air Force to practise low level high-speed flying, the investigation report was concerned about the lack of information on the military low-flying route available to civil pilots, particularly those involved with crop spraying, pipeline, and powerline inspection.

Cause
The investigation determined "The accident occurred because neither pilot saw the other aircraft in time to avoid collision. The 'see and be seen' principle was inadequate for preventing collision in the circumstances that existed. A significant feature which contributed to the accident was the absence of any system for co-ordinating military and civil low flying activities in the low flying areas and link routes."

Recommendations
The accident report made seven recommendations:
 That the location and vertical extent of the low flying areas and link routes should be made available.
 Private pilots should be alerted to the nature of military low flying activities and the need to avoid them.
An advisory service be provided to enable civil pilots to co-ordinate their activities with the military.
That civil aircraft involved in low flying activities should be painted as conspicuously as possible and fitted with high-power collision warning lights preferably strobe type. Also recommended that the military consider fitment of strobe type high-power collision warning lights to aircraft engaged in low level training.
The military review their need for airspace for low-level high-speed operations and withdraw any areas not needed.
That the upper limit of the military low flying link routes be limited to  instead of , if not possible then  should be considered.
That the rules of the air be amended to allow aircraft with the right of way to climb and if necessary pass over the other aircraft.

References

Aviation accidents and incidents in 1974
Aviation accidents and incidents in Norfolk
Mid-air collisions in the United Kingdom
Accidents and incidents involving Royal Air Force aircraft
Norfolk Mid-air Collision, 1974
Low flying
Military history of Norfolk
Mid-air collisions involving general aviation aircraft
Mid-air collisions involving military aircraft
McDonnell Douglas F-4 Phantom II
20th century in Norfolk
1974 in military history
August 1974 in the United Kingdom
1974 disasters in the United Kingdom