UK Airprox Board UK Airprox Board
  • Assessment Summary Sheet for UKAB Meeting on Wednesday 24th February 2021

    Contributory factor assessment for each Airprox can be downloaded here


    Total A B C D E
    14 2 7 4 0 1


    Airprox Aircraft 1 (Type) Aircraft 2 (Type) Airspace (Class)



    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 for UKAB Meeting on 24th February 2021

    Contributory factor assessment for this Airprox can be downloaded here


    Total Risk A Risk B Risk C Risk D Risk E
    1 0 0 1 0 0





    Time (UTC) 









    Pilot/Controller Report

    Reported Separation

    Reported Risk

    Comments/Risk Statement




    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.