Transport Secretary Patrick McLoughlin told MPs it was currently thought what happened "was not an automaton occurrence".
Air mishap examiners said they had not precluded an automaton but rather had no confirmation to bolster the proposal.
An examination was propelled after the pilot of a BA flight from Geneva on April 17 said an item struck the plane.
The Metropolitan Police had said the plane was flying at around 1,700ft over the zone of Richmond Park, in south west London, at the season of the occurrence.
The Airbus A320 was conveying 132 travelers and five group as it drew nearer the airplane terminal. It landed securely.
The episode had been thought to be the primary automaton impact with a flying machine in the UK.
The UK Air Closeness Board - which examines close miss occurrences in UK airspace - says there had been various genuine close misses at UK air terminals including rambles.
The most recent insights from the load up appeared there was another automaton close miss on February 14 with an Airbus A320 that was flying out of Heathrow at 12,500ft.
The group reported missing the 6ft wide dark automaton, which had a glimmering red light, by 20ft.
The pilot surveyed the danger of impact as "high". The automaton administrator couldn't be followed.
The leader of the Worldwide Air Transport Affiliation, Tony Tyler, recently cautioned that automatons flown by the overall population were "a genuine and developing danger" to regular citizen air ship.
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