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Assessment Summary Sheet

Contributory factor assessment for each assessed Airprox can be downloaded.

Number of Airprox reports assessed, and their ICAO Risk rating
Total Risk A Risk B Risk C Risk D Risk E
15 1 4 4 1 5
Assessed Airprox reports
Airprox Aircraft 1 (Type) Aircraft 2 (Type) Airspace (Class) ICAO Risk
2020099 ASK13 (Civ Gld) Spitfire (Civ FW) London FIR (G) C
2020101 ASW27 (Civ Gld) Unk Helicopter (Civ Helo) London FIR (G) D
2020102 HpH Shark (Civ Gld) Ventus 2C (Civ Gld) London FIR (G) E
2020103 Skyranger (Civ FW) PA28 (Civ FW) London FIR (G) B
2020104 Venture TMG (Civ FW) Mooney M20 (Civ FW) London FIR (G) B
2020106 DA40 (Civ FW) Pitts (Civ FW) London FIR (G) B
2020107 PA25 (Civ FW) C510 (Civ Comm) London FIR (G) E
2020109 Falcon 2000 (Civ Comm) Glasflügel Mosquito (Civ Gld) London FIR (G) A
2020111 DA40 (Civ FW) Glider (Civ Gld) London FIR (G) C
2020112 P68 (Civ Comm) Unknown Glider (Civ Gld) London FIR (G) C
2020114 EC135 (NPAS) R22 (Civ Helo) Elstree ATZ (G) E
2020115 Falcon 20 (Civ Comm) PA18 (Civ FW) London FIR (G) E
2020116 PA28 (Civ FW) MD500 (Civ Helo) Blackbushe ATZ (G) C
2020117 Hapi Cygnet SF2A (Civ FW) PA23 (Civ FW) London FIR (G) B
2020119 Hawk (HQ Air Trg) EV97 (Civ FW) Scottish FIR (G) E


Consolidated Drone/Balloon/Model/Unknown Object Summary Sheet

Contributory factor assessment for each Drone/Balloon/Model/Unknown Object Airprox can be downloaded.

Number of Drone/Balloon/Model/Unknown Object reports, and their ICAO Risk rating
Total Risk A Risk B Risk C Risk D Risk E
1 0 1 0 0 0
Airprox Number Date

Time (UTC)

Object Location [1]



Pilot/Controller Report

Reported Separation

Reported Risk
Comments/ Risk Statement ICAO Risk

16 Oct 20   



(Civ Comm)


5127N 00023W

2NM ESE Heathrow


London CTR


The PA31 pilot reports a near miss with a drone while calibrating the London City ILS. The drone was 12-18 inches in size, green in colour and at 2000ft, approximately 1NM to the south of Heathrow's southern runway centreline.


Reported Separation: 0ft V/50-75ft H

Reported Risk of Collision: NR


The NATS Safety Investigation reports that the SVFR controller telephoned Heathrow Tower at 11:24:15 and informed them of the drone sighting by the crew of [the PA31]. This information was passed to aircraft waiting to depart, of which one was already established on the take-off roll on RW09R. At 1125:35, a sporadic radar contact displayed approximately 1NM northwest of the previously reported drone position.

In the Board’s opinion the reported altitude and/or description of the object were sufficient to indicate that it could have been a drone. Subsequently, another pilot reported sighting an object approximately 2min later in a similar position [Airprox 2020150].


Applicable Contributory Factors: 1, 2, 3, 4, 6


Risk: The Board considered that the pilot’s overall account of the incident portrayed a situation where safety had been much reduced below the norm to the extent that safety had not been assured.


[1] Latitude and Longitude are usually only estimates that are based on the reported time of occurrence mapped against any available radar data for the aircraft’s position at that time. Because such reported times may be inaccurate, the associated latitudes and longitudes should therefore not be relied upon as precise locations of the event.

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