UK Airprox Board UK Airprox Board
  • Assessment Summary Sheet for Aircraft incidents for UKAB Meeting on 24th May 2017


      Total Risk A Risk B Risk C Risk D Risk E
    Aircraft 15 2 1 8 0 4

     

    Airprox

    Aircraft 1

    (Type)

    Aircraft 2

    (Type)

    Airspace

    (Class)

    Cause ICAO Risk
    2016241

    PA28(A)

    (Civ Pte)                       

    PA28(B)

    (Civ Trg)

    London FIR

    (G)

    A late sighting by the PA28(A) pilot and a non-sighting by the PA28(B) pilot.

    Contributory: 1. ATC instructed the PA28(A) pilot to hold at a VRP.

    2. A lack of coordination between Radar and Tower regarding the holding PA28(A).

    B
    2017001

    MD902

    (HEMS)

    Light Aircraft

    (Unknown)

    London FIR

    (G)

    A late sighting by the MD902 pilot and potentially a non-sighting by the microlight pilot. C
    2017002

    Voyager

    (HQ Air Ops)                            

    F15

    (Foreign Mil)

    AARA8

    (G)

    The F15 pilot flew into conflict with the Voyager.

    Contributory: 1. The radar controllers did not issue timely Traffic Information.

    2. The Tac Right controller’s workload was such that he was distracted and did not sufficiently monitor the F15s.

    3. The F15 crews were not aware that AARA8 was active.

    4. Misunderstanding between the F15 crews and both controllers regarding the F15 planned operating area.

    A
    2017003

    PA34

    (Civ Trg)

    Chinook

    (HQ JHC)

    London FIR

    (G)

    The PA34 pilot was concerned by the proximity of the Chinook.

    Contributory: The Chinook pilot flew towards the Oxford approach path without calling Oxford ATC.

    E
    2017005

     A319(A)

    (CAT)

    A319(B)

    (CAT)

    London TMA

    (A)

    A TCAS sighting report. E
    2017006

    S92

    (Civ Comm)

    EC175

    (Civ Comm)

    Scottish FIR

    (G)

    The S92 pilot was concerned by the proximity of the EC175. E
    2017012

    C152

    (Civ Trg)

    AS350

    (Civ Pte)

    Wycombe ATZ

    (G)                                                    

    The AS350 pilot inadvertently flew through the Wycombe ATZ and into conflict with the C152. A
    2017014

    Tutor(A)

    (RN)

    Tucano

    (HQ Air Trg)                   

    Yeovilton ATZ

    (G)

    The Tutor(A) pilot was concerned by the proximity of the Tucano. E
    2017015

    S92

    (SAR)

    Hawk

    (HQ Air Ops)

    London FIR

    (G)

    A conflict in Class G. C
    2017016

    AW139

    (HEMS)

    Duo Discus

    (Civ Club)

    Lee on Solent ATZ

    (G)      

    A conflict in the visual circuit resolved by the AW139 pilot. C
    2017020

    RV8

    (Civ Pte)

    SR20

    (Civ Pte)

    North Weald Airfield

    (G)

    The RV8 pilot was concerned by the proximity of the SR20. C
    2017022

    S92(1)

    (Civ Comm)

    S92(2)

    (Civ Comm)

    Scottish FIR

    (G)

    The S92(2) pilot set the wrong QNH and flew into conflict with the S92(1).

    Contributory: 1. The controller did not detect the incorrect QNH readback from the S92(2) pilot.

    2. ATC distraction resulted in the controller not assimilating the STCA warning.

    C
    2017023

    Squirrel(A)

    (HQ Air Trg)

    Squirrel(B)

    (HQ Air Trg)

    London FIR

    (G)

    The Squirrel pilots did not integrate sufficiently with each other. C
    2017024

    CL601

    (Civ Exec)

    TBM700

    (Civ Pte)

    Biggin Hill ATZ

    (G)

    Biggin ATC released the CL601 into conflict with the TBM700.

    Contributory: Lack of Traffic Information to either pilot.

    C
    2017049

    PA28(A)

    (Civ Pte)

    PA28(B)

    (Civ Pte)

    Sleap ATZ

    (G)

    The PA28(B) pilot did not fly a correct overhead join and descended into conflict with PA28(A). C

     

  • Consolidated Drone/Balloon/Model/Unknown Object Report Sheet for UKAB Meeting on 24th May 2017

    Download below sheet as pdf  

    Total Risk A Risk B Risk C Risk D Risk E
    22 5 9 5 2 1

     

    Airprox

    Number

    Date

    Time (UTC)

    Aircraft

    (Operator)

    Object

    Location

    Description

    Altitude

    Airspace

    (Class)

    Pilot/Controller Report

    Reported Separation

    Reported Risk

    Cause/Risk Statement

    ICAO

    Risk

    2017004

    5 Jan 17

    1212

    C152

    (Civ Pte)

     
    Drone

    5118N 00032W

    1.5nm SE Woking

    310ft agl

    London FIR

    (G)

    THE DRONE PILOT reports conducting an aerial survey of a building. Fairoaks aerodrome, Woking police and HMP Send had previously been contacted to advise them of the activity.  Fairoaks were re-contacted on the morning of flight and the drone operator was asked to advise when finished. On the second sortie around the building he heard an aircraft approaching from behind, heading toward the drone. The operator saw a white/cream coloured, high-wing, single-engine aircraft. He started to descend the drone but then stopped because he could not assess whether he was descending into the flight-path of the approaching aircraft. The aircraft passed over the drone.

     

    THE C152 PILOT reports transiting the area at 1100ft altitude. He did not see a drone.

    Cause: The drone was entitled to operate at that location and altitude, and was not endangering other aircraft by, for example, being flown in proximity to airfield approach paths. The Board commended the drone pilot for reporting the Airprox and agreed that he had been concerned due to his perception of the C152 aircraft’s altitude but that the radar analysis showed it was at an altitude which provided adequate separation from the drone. The incident was therefore best described as a sighting report.

     

    Risk: The Board considered that the drone’s separation, allied to the operator’s ability to avoid the C152 portrayed a situation where normal procedures and/or safety standards had applied.

    E
    2017007

    2 Jan 17

    1450

    A320

    (CAT)

    Drone

    5124N 00004W

    5nm NW BIG VOR

    6000ft

    London TMA

    (A)

    THE A320 PILOT reports that they had reached the initial SID altitude when the first officer noticed a ‘regular-sized’, light grey quadcopter type drone a few hundred meters away in the 1 o’clock position which passed down the right hand side of the aircraft.

     

    Reported Separation: 300ft V/200m H

    Reported Risk of Collision: Medium

    Cause: The drone was being flown beyond VLOS limits and was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the A320.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his ability to avoid the object portrayed a situation where although safety had been compromised, there had been no risk of collision.

    C
    2017008

    21 Jan 17

    1615

    S92

    (SAR)

    Drone

    5311N 00413W

    Menai Strait

    500ft

    London FIR

    (G)

    THE S92 PILOT reports en-route from Bangor Hospital to Caernarfon when a black quadcopter drone was seen. The aircraft was turned away and continued to base.

     

    Reported Separation: 0ft V/200m H

    Reported Risk of Collision: High

    Cause: The drone was entitled to operate at that location and altitude, and was not endangering other aircraft by being flown in proximity to airfield approach paths etc, and so the Board agreed that the incident was therefore best described as a conflict in Class G.

     

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

    C
    2017009

    22 Jan 17

    1437

    Bell 206

    (Civ Comm)

    Drone

    5129N 00007W

    Vauxhall Bridge

    1300ft

    London CTR

    (D)

    THE BELL 206 PILOT reports that whilst on Heliroute H4 at Vauxhall Bridge, he encountered a drone at the same altitude, approx 200ft away.

     

    Reported Separation: 0ft V/200ft H

     

    THE LTCC RADAR CONTROLLER reports that at about 1437Z the Bell 206 pilot on Heliroute H4 reported a drone encounter.  He reported it as being black and at approx 1500ft in the vicinity of the Oval cricket stadium.  Other aircraft in the vicinity were warned, but no further reports were received.

    Cause: The drone was being flown beyond practical VLOS limits and was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the Bell 206.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where safety had been much reduced below the norm to the extent that safety had not been assured.

    B
    2017011

    26 Jan 17

    0854

    A321

    (CAT)

    Balloon

    5156N 00003W

    5nm SW of BKY

    FL070

    London TMA

    (A)

    THE A321 PILOT reports that whilst on departure towards CPT an object, probably a weather balloon was observed passing overhead the aircraft within a few hundred feet.

     

    Reported Separation: 100-200ft V/0m H

     

    THE SWANWICK NW DEPS RADAR CONTROLLER reports that the A321 was outbound, about 7nm west of BKY, when the crew reported a weather balloon passing them. The following aircraft did not report seeing anything.

    Cause: Being an un-tethered and unmanned balloon or unknown object, the Board agreed that it was not under direct control and that the incident was therefore best described as a conflict in Class A airspace.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where safety had been much reduced below the norm.

    B
    2017013

    03 Feb 17

    1145

    Squirrel

    (HQ Air Trg)

    Unknown

    5247N 00244W

    RAF Shawbury

    800ft

    Shawbury ATZ

    (G)

    THE SQUIRREL PILOT reports that he was joining the airfield at 1000ft, on commencing a descending base-leg turn the LHS pilot called out that he had seen a drone in the 11 o’clock position, approx 100ft above. They were already turning and descending away from the drone so no further avoiding action was required. The drone was approx 5ft in diameter and white with red outriggers.  It was reported to ATC.

     

    Reported Separation: 100ft V/0m H

    Reported Risk of Collision: High

     

    THE SHAWBURY ADC reports that as the Squirrel approached the airfield, the pilot requested permission to cross the approach lane, immediately after the clearance was given the pilot reported seeing a drone at 800ft QFE, approx 1/2nm north of the airfield. The UAV was not visible from the tower, and all subsequent joining aircraft were warned of its presence.

    Cause: The drone was being flown in the vicinity of an airfield approach path such that it was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the Squirrel.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where providence had played a major part in the incident and/or a definite risk of collision had existed.

    A
    2017017

    13 Feb 17

    1930

    Q400

    (CAT)

    Drone

    5054N 00123W

    3nm SSW Southampton

    1000ft

    Southampton CTR

    (D)

    THE Q400 PILOT reports that at approximately 1000 feet agl & flying a visual approach onto RW02 at SOU, he noticed an object with a light flying towards him. It was slightly above and to the right of his position heading in a Southerly direction. He at first believed it may have been a Chinese lantern however, as it got closer he realised that it was jelly fished shaped and was more likely to be a drone. The wind at 1500ft was 080/35kts & it would be impossible for a Chinese lantern to maintain a southerly direction. He informed ATC at 1.5nm that he believed a drone had come within about 100ft of the aircraft.

     

    Reported Separation: 100ft V/50-100m H

    Reported Risk of Collision: Medium

     

    THE SOUTHAMPTON ADC reports that the Q400 crew reported sight of a drone at approximately 3nm and 1000ft height. Police were informed and attended the area.

    Cause: The drone was being flown in the vicinity of an airfield approach path such that it was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone/model was flown into conflict with the Q400.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where safety had been much reduced below the norm to the extent that safety had not been assured.

    B
    2017018

    12 Feb 17

    1727

    A320

    (CAT)

    Drone

    5127N 00058W

    15nm WSW Heathrow

    4800ft

    London TMA

    (A)

    THE A320 PILOT reports that whilst in a right turn and descending he saw a drone passing slightly above the left wing, it was immediately reported to Heathrow Director. The drone was approx 50cm in size, grey and a ‘crossbeam’ type with 4 rotors.

     

    Reported Separation: 15-20ft V/20-50m H

    Reported Risk of Collision: High

    Cause: The drone was being flown beyond practical VLOS limits and was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone/model was flown into conflict with the A320.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where providence had played a major part in the incident and/or a definite risk of collision had existed.

    A
    2017025

    24 Feb 17

    1400

    Chinook

    (JHC)

    Drone

    5133N 00033W

    Black Park, Slough

    1400ft

    London CTR

    (D)

    THE CHINOOK PILOT reports that whilst transiting along Heliroute H10 between Cookham and Iver when a small (approx 2ftx2ft) drone was seen to pass about 100m down the left hand side of the aircraft at the same altitude.  The sighting was reported to Northolt App.

     

    Reported Separation: 0ft V/100m H

    Reported Risk of Collision: High

     

    THE NORTHOLT APP CONTROLLER reports that the Chinook was on Helilane H10, when passing Wexham park he reported passing a drone at the same altitude (1400ft).  Denham Tower and Northolt Tower were both informed, as were subsequent Northolt departures.

    Cause: The drone was being flown beyond practical VLOS limits and was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone/model was flown into conflict with the Chinook.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where safety had been much reduced below the norm to the extent that safety had not been assured.

    B
    2017027

    28 Feb 17

    1510

    King Air Balloon

    5315N 00002W

    10nm NNE Coningsby

    6500ft

    London FIR

    (G)

    THE KING AIR PILOT reports that he was at the start of the descent process at 6500ft approximately 10nm NNE of Coningsby when what appeared to be a dark coloured object of approximately 80cm diameter was spotted late about 20m from the aircraft passing down the left hand side. The crew felt the object passed over the top of the aircraft but could not rule out the possibility of it striking the tail. Once clear of the object a full low speed handling check was completed and the aircraft recovered to base without further incident. The crew felt that the object was most likely a balloon and informed ATC

     

    Reported Separation: 0ft V/<5m H

    Reported Risk of Collision: Medium

    Cause: Being an un-tethered and unmanned balloon or unknown object, the Board agreed that it was not under direct control and that the incident was therefore best described as a conflict in Class G airspace.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where providence had played a major part in the incident and/or a definite risk of collision had existed.

    A
    2017033

    6 Mar 17

    2010

    DH8

    (CAT)

    Unknown Object

    5130N 00003E

    W London City

    1500ft

    London TMA

    (A)

    THE DH8 PILOT reports that after a normal departure from London City RW27 the crew were ‘heads-in’ undertaking after take-off checks, the CP was reading the checks and the FO responding. On passing approx 1500 -1700ft both pilots’ attention was drawn to something passing overhead the aircraft. Neither could be sure exactly what they saw, but independently witnessed an object that had at least 4 white lights, travel up the view of the windscreen to pass directly overhead the centre of the aircraft.  No other detail could be made out, the size and speed of the object could not be assessed, it was assumed to be in very close proximity, at around 100ft.  Both pilots assumed it to be a drone, due to the lights, although it may have been another object reflecting the aircraft’s own landing lights. The traffic ahead (approx 3000ft above) was on TCAS, but no other TCAS contacts were observed. The event happened too quickly for either pilot to react to.

     

    Reported Separation: 100ft V/0m H

    Cause: The Board agreed that here was not enough information to identify the unknown object and the incident was therefore classified as a conflict in Class A.

     

    Risk: The Board considered that the incident portrayed a situation where there was insufficient information to make a sound judgement of risk.

    D
    2017034

    7 Mar 17

    1125

    Eurostar

    (Civ Pte)

    Drone

    5410N 00242W

    6nm NE Hest Bank

    4600ft

    London FIR

    (G)

    THE EUROSTAR PILOT reports in level cruise when a white two-rotor drone passed 200 feet below and 50 feet to the left of his aircraft. He noted that he was operating in broken cloud and that it was unlikely the drone was visible to an operator on the ground as it was white against a cloudy sky.

     

    Reported Separation: 200ft V/50ft H

    Reported Risk of Collision: Medium

    Cause: The drone was being flown beyond practical VLOS limits and was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the Eurostar.

     

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

    C
    2017035

    2 Feb 17

    1603

    A319

    (CAT)

    Unknown

    5438N 00157W

    6nm N Barnard Castle

    FL170

    Airway P18

    (A)

    THE A319 PILOT reports in the climb to cruise level. As the aircraft was approaching FL180 (with a higher cleared level), positioned approximately 5nm west abeam P18 airway between waypoints GIRLI & TILNI, a moving object/aircraft caught the attention of the Captain (PF), heading almost directly overhead the aircraft in the opposite direction. The object/aircraft passed at high speed, very quickly, only being in view for approximately 2 seconds.  It passed overhead, in-line with engine 2 [right engine], estimated to be about 200ft above the aircraft.  It was angular & appeared fast moving.  PF initially believed it was a military fast jet.  PF took the radio and enquired with controller what had passed overhead.  Controller responded to say there was only an aircraft about 20,000ft above their level.  A subsequent ATC call enquired if the conflicting traffic could have been a drone to which the Captain responded that it could have been. ATC advise they would be submitting a report.

     

    Reported Separation: 200ft V/0m H

    Reported Risk of Collision: Low

    Cause: Being an unknown object, the Board agreed that it was not under direct control and that the incident was therefore best described as a conflict in Class A.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his ability/inability to avoid the object portrayed a situation where safety had been much reduced below the norm to the extent that safety had not been assured.

    B
    2017039

    5 Feb 17

    1250

    A319

    (CAT)

    Drone

    5320N 00259W

    4.5nm W Liverpool Airport

    1550ft

    Liverpool CTR

    (D)

    THE A319 PILOT reports approaching LPL RW09, at 4.5nm from the runway threshold, when he saw a white quadcopter pass down the left side at the same level. He noted there was no time to manoeuvre but that this would have been unwise in any case due to the high-drag configuration at relatively low speed whilst in proximity to the ground The incident was reported to ATC.

     

    Reported Separation: 0ft V/200m H

    Reported Risk of Collision: Medium

    Cause: The drone was being flown in the vicinity of an airfield approach path such that it was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the A319.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where safety had been much reduced below the norm to the extent that safety had not been assured.

    B
    2017041

    24 Feb 17

    1108

    A319

    (CAT)

    Drone

    5135N 00027W

    7nm N of Heathrow

    FL080

    London TMA

    (A)

    THE A319 PILOT reports that he was leaving BNN on a heading of 165 degrees and about 7nm north of LHR when he saw a drone pass underneath the aircraft.

     

    Reported Separation: 100-200ft V/0m H

    Reported Risk of Collision: Not reported.

    Cause: The drone was being flown beyond practical VLOS limits and was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the A319.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his ability/inability to avoid the object portrayed a situation where safety had been much reduced below the norm to the extent that safety had not been assured.

    B
    2017055

    08 Apr 17

    1452

    B737

    (CAT)

    Drone

    5458N 00130W

    12nm SSE Newcastle VOR

    FL095

     

    Newcastle CTA

    (D)

    THE B737 PILOT reports that during the climb from NCL with autopilot engaged an object passed down the left and side of the aircraft within 1000ft vertically, 0.5nm horizontally. The object appeared to be a drone dark in colour and was glinting in the sun. The location was approximately 12nm SSE from NEW VOR.

     

    Reported Separation: 1000ft V/0.5nm H

    Reported Risk of Collision: Low

     

    THE NEWCASTLE CONTROLLER reports that the B737 departed RW07 climbing straight ahead to FL80 due to a survey aircraft to the south of him. He instructed the B737 to climb to FL150 and when he was clear of the survey aircraft he turned him right onto a heading of 190 degrees and then further right onto 220 degrees. At 1452 the B737reported sighting a Drone on his left hand side about 1000ft below him as he was passing about 9500ft. No Drone activity had been advised to Newcastle in our Controlled Airspace. Nothing significant was observed on the Radar near the B737 however an intermittent contact did appear on the Radar very briefly but disappeared immediately, he regarded this as spurious or anoprop as it was inside Controlled Airspace.

    Cause: The drone was being flown beyond practical VLOS limits and was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the B737.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his ability/inability to avoid the object portrayed a situation where although safety had been compromised, there had been no risk of collision.

    C
    2017058

    6 Apr 17

    1600

    Hawk

    (RN)

    Drone

    5005N 00515W

    RNAS Culdrose

    800ft

    Culdrose ATZ

    (G)

    THE HAWK PILOT reports that on the downwind leg for Culdrose RW30, at 1200 for a PFL, he saw a large black quadcopter type drone hovering at a height of about 800ft.  It was between his position and the ATC Tower. He informed the ADC then broke off the PFL and climbed to 1500ft to try and regain visual contact, but couldn’t see it again. He noted that had he been flying a normal visual circuit he would have been much closer to it.

     

    Reported Separation: 500ft V/0.5nm H

    Reported Risk of Collision: High

     

    Cause: The drone was being flown in the vicinity of an airfield such that it was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the Hawk.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his ability to avoid the object portrayed a situation where although safety had been compromised, there had been no risk of collision.

    C
    2017061

    11 Apr 17

    1912

    DH8

    (CAT)

    Balloon

    5257N 00127W

    NW Derby

    FL240

    London UIR

    (A)

    THE DH8 PILOT reports that whilst cruising at FL240, approx 7nm SE of TNT VOR, a dark object, about 1-2ft in diameter, rapidly passed the right-hand-side of the aircraft.  Both pilots witnessed it and exclaimed loudly. It was estimated to be within 5-10m of the right wing.  ATC were informed and were asked whether any Met Balloons were due to be released in the area.  They advised that a Met balloon was launched from Sheffield, although this was East of their position and had been planned for 3 hours earlier.

    Cause: Being an un-tethered and unmanned balloon or unknown object, the Board agreed that it was not under direct control and that the incident was therefore best described as a conflict in Class A airspace.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where providence had played a major part in the incident and/or a definite risk of collision had existed.

    A
    2017063

    10 Apr 17

    1230

    Puma

    (JHC)

    Drone

    5200N 00027W

    NW Maulden

    350ft

    London FIR

    (G)

    THE DRONE OPERATOR reports that the drone was at approximately 350ft and hovering stationary above the flying field.  He heard a loud Helicopter noise which and seemed very close by, so he started to descend immediately. He asked his spotter if he could see the helicopter, he saw it almost immediately appear just above the tree line coming from the west at very low level, the spotter shouted to stop descending as the Helicopter was lower than the drone and on a course to where the drone currently was.  He had only been descending for a couple of seconds so he estimates the drone would now be between 250 and 320 feet.  The helicopter, which he is confident was a military Merlin type, then flew underneath the drone. It was hard to estimate the separation, but given his drones altitude was approximately 300ft, it would not have been a large margin.  The Helicopter then proceeded towards the East at "tree top" level until out of sight. He estimates the time frame from hearing the Helicopter to it being overhead was less than 10 seconds and it was travelling at a very fast speed.

     

    Reported Separation: 150ft V/0m H

    Reported Risk of Collision: High

     

    THE PUMA PILOT reports that he was on a training sortie which included a transit through the London heli-lanes. After the sortie, an Airprox was filed from a UAS operator stating his aircraft passed close to the drone’s area of operation. Upon checking the NOTAMS there was nothing notified and the crew did not observe the aforementioned UAS.

    Comments: The Board were heartened that that the drone operator submitted the original Airprox report, they acknowledged this displayed a good example of best practice. The Board they looked at the actions of the drone operator, they agreed that the operator had endeavoured to separate his drone from the helicopter to the best of his ability by firstly trying to descent his drone then, when he realised the helicopter would pass beneath his drone, stopping the descent until the helicopter had passed. The Board agreed that both aircraft were entitled to operate in the area and therefore see and avoid was an effective barrier in this situation.  

     

    Cause: The drone was entitled to operate at that location and altitude and so the Board agreed that the incident was therefore best described as a conflict in Class G.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his ability/inability to avoid the object portrayed a situation where safety had been much reduced below the norm to the extent that safety had not been assured.

    B
    2017067

    12 Apr 17

    1001

     

    A320

    (CAT)

    Unk Obj

    5049N 00027E

    10nm SE TIMBA

    FL100

    London TMA

    (A)

    THE A320 PILOT reports that he was descending through FL100, routing direct to TIMBA, after sequencing vectors from the TIMBA4B arrival, approximately 10DME SE of TIMBA at 220kts IAS, CM2 caught sight of an object passing almost directly above the aircraft in the opposite direction at speed. The appearance was metallic/reflective, with an angular shape, not round. Object only in field of view for 2 seconds maximum at 11 o'clock, high, opposite direction. No actions were taken other than PIREP to LGW DIR. The object was not in conflict, although had it been there would have been no time for avoiding action. TCAS briefly set to above to look for fast moving traffic on an opposite track, nothing seen. No traffic information sought, as he had been handed over to LGW DIR, from LONDON a couple of minutes prior to the event. CM1 did not see the object. His immediate perception was a small object close by moving slowly or drifting, with the high closure rate perceived as a result of his own speed. An alternative could be fast jet traffic well above, in which case no loss of separation existed. He is not used to seeing southbound aircraft in this area at these levels, which is usually dominated by LGW and LHR inbounds. Bright environment, with reflections on windscreens, may also have factored.

     

    Reported Separation: 1000ft V/200m H

    Cause: The A320 pilot was concerned by the proximity of the unknown object.

     

    Risk: The Board agreed that there was insufficient information to make a sound judgement of risk.

    D
    2017068

    22 Apr 17

    1733

    A319

    (CAT)

    Drone

    5325N 00251W

    5nm N Liverpool Airport

    2500ft

    Liverpool CTR

    (D)

    THE A319 PILOT reports the he was 5nm N of the Airfield on a downwind approach to RW27.  The FO noticed something flying towards the aircraft.  It was initially presumed to be a bird.  However, as it got closer the FO realised it was a blue drone with flashing lights. It passed at the same level within a metre of the wing-tip. Had the aircraft been in manual control the FO would have taken avoiding action, the only reason there was not a collision was down to luck.

     

    Reported Separation: 0ft V/1m H

    Reported Risk of Collision: High

    Cause: The drone was being flown beyond practical VLOS limits and was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the A319.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his inability to avoid the object portrayed a situation where providence had played a major part in the incident and/or a definite risk of collision had existed.

    A
    2017070

    15 Apr 17

    1704

    A320

    (CAT)

    Drone

    5128N 00006W

    2.3nm E LHR

    870ft alt

    London CTR

    (D)

    THE A320 PILOT reports that the RPAS crossed their flight path from their 2 o'clock position on a heading of about 130 degrees in level flight. It was about 100ft below their altitude at the crossing point of both trajectories

     

    Reported Separation: 100ft V/50m H

     

    Cause: The drone was being flown in the vicinity of an airfield approach path such that it was endangering other aircraft at that location and altitude. The Board agreed that the incident was therefore best described as the drone was flown into conflict with the A320.

     

    Risk: The Board considered that the pilot’s estimate of separation, allied to his overall account of the incident and his ability/inability to avoid the object portrayed a situation where safety had been much reduced below the norm to the extent that safety had not been assured.

    B