Coverings on both engines were left unlatched after maintenance on the BA plane in last week's Heathrow landing drama according to a report.
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The largest commercial aircraft in the world has landed at Heathrow this morning.
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Jean Ralphs, from Oxford, was a passenger sitting in seat 3F on the BA flight forced to make an emergency landing at Heathrow last week, after both engines were left unlatched.
Here she tells ITV Meridian what she saw as one engine caught fire.
The report has made the following safety recommendation and a fuller report is expected later in the year:
"It is recommended that Airbus formally notifies operators of A320-family aircraft of the fan cowl door loss event on A319 G-EUOE on 24 May 2013, and reiterates the importance of verifying that the fan cowl doors are latched prior to flight by visually checking the position of the latches."
The report said the BA plane had undergone scheduled maintenance the night before the incident, which required opening the fan cowl doors on both engines to check oil levels.
The report noted that the plane manufacturer Airbus had recommended airlines strictly adhere to maintenance standards following previous instances of fan cowl door separation on the A320 "family" of planes, which include the A319 in last week's incident.
The report said that last July Airbus said there had been 32 reported fan cowl door detachments.
On some occasions, significant damage was caused to the aircraft but none of those events resulted in a fire.
"The source of ignition that led to the in-flight fire is still under investigation," the AAIB said.
It has been revealed there were 32 other incidents of aircraft engine doors falling off according to today's safety report.
Airlines are being told of the dangers and to ensure they meet proper maintenance procedures.
The report says: "This event has shown that the consequences of fan cowl door detachment are unpredictable and can present a greater risk to flight safety than previously experienced."
Of the previous incidents is says: "80% occurred during the take off phase of flight. On some occasions significant damage was caused to the aircraft, however, none of these events had resulted in a subsequent engine fire."
An interim report into the incident at Heathrow last week in which a plane made an emergency landing says poor maintenance is to blame.
Doors that cover both engines were "left unlatched during maintenance" says the report from air investigators at Farnborough.
Both of the fan cowl doors came off after the plane left Heathrow but one punctured a fuel pipe causing a fire and the emergency.
The report says: "Fan cowl doors from both engines detached puncturing a fuel pipe on the right engine and damaging the airframe, and some aircraft systems.
"The flight crew elected to return to Heathrow. On the approach to land an external fire developed on the right engine. The left engine continued to perform normally throughout the flight. The right engine was shut down and the aircraft landed safely and was brought to a stop on Runway 27R."
A full-scale emergency was declared after the A319 plane took off. It had 75 passengers and was heading to Oslo.
The report continues: "The emergency services quickly attended and extinguished the fire in the right engine. The passengers and crew evacuated the aircraft via the escape slides, without injury."