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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
14 2 7 4 0 1
Assessed Airprox reports
Airprox Aircraft 1 (Type) Aircraft 2 (Type) Airspace (Class) ICAO Risk
2020136 Sportavia (Civ FW) DA40 (Civ FW) Exeter ATZ (G) B
2020143 EC145 (HEMS) C150 (Civ FW) London FIR (G) B
2020145 BE76 (Civ FW) EMB505 (Civ Comm) Bournemouth CTR (D) C
2020149 AW169 (HEMS) R66 (Civ Helo) London FIR (G) E
2020151 PA34 (Civ FW) Grob109 (Civ FW) London FIR (G) C
2020152 SF25C Glider (Civ FW) PA28 (Civ FW) London FIR (G) B
2020153 ASK13 (Civ Gld) PA22 (Civ FW) London FIR (G) B
2020154 Tutor (HQ Air Trg) F35x2 (Foreign Mil) Marham ATZ (G) B
2020156 Sonaca 200 (Civ FW) PA28(A) (Civ FW) Blackbushe ATZ (G) B
2020157 BE200 (Civ Comm) Embraer 145 (CAT) Scottish FIR (G) C
2020158 Wildcat(A) (HQ JHC) Wildcat(B) (RN) Yeovilton ATZ (G) C
2020159 SZD-51 Junior (Civ Gld) PA28 (Civ FW) London FIR (G) A
2020160 C42 (Civ FW) PA28 (Civ FW) London FIR (G) A
2020161 AC11 (Civ FW) R44 (Civ Helo) Blackbushe ATZ (G) B


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 0 1 0 0
Airprox Number Date

Time (UTC)

Object Location [1]



Pilot/Controller Report

Reported Separation

Reported Risk
Comments/ Risk Statement ICAO Risk

3 Jan 21





5138N 00020W

Overhead Elstree


London TMA


The A319 pilot reports departing Heathrow RW09R on an ULTIB1B departure. When near ULTIB and level at 6000ft, the Captain sighted a drone approximately 500m away in the 11 o’clock position and around 300ft below. The drone was white in colour, approximately 1m diameter and with green and red lights. It passed directly underneath their aircraft.


Reported Separation: 300ft V/0m H

Reported Risk of Collision: NR


The NW Departures controller reports that the pilot reported the drone sighting to them and that they subsequently passed the reported position to the Heathrow Approach controller for passing to other aircraft in the vicinity.


The NATS Safety Investigation found that there were no associated primary or secondary contacts visible on radar at the approximate time of the event.


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.


Applicable Contributory Factors: 1, 2, 3, 4, 5


Risk: The Board considered that the pilot’s overall account of the incident portrayed a situation where although safety had been reduced, there had been no risk of collision.


[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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