Contributory factor assessment for each Airprox can be downloaded here
Contributory factor assessment for this Airprox can be downloaded here
16 Oct 20
2NM ESE Heathrow
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
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].
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.
 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.