Airbus A320neos subject to airworthiness directive due to ‘potentially unsafe’ centre of gravity issues

Albert Galea The Airbus A320neo – of which Air Malta currently has three – has become the subject of an airworthiness directive issued by the European Aviation Safety Agency ( EASA) following the finding of an issue with the aircraft’s centre of gravity envelope.

The issue, while described by the EASA as being ‘potentially unsafe’, has never been encountered during operations, but is deemed serious enough by the EASA to warrant a directive.

The directive was issued on 31 July 2019 and came into force on 14 August 2019.

“Analysis and laboratory testing of the behaviour of the flight control laws of the A320neo identified a reduced efficiency of the angle of attack protection when the aeroplane is set in certain flight configurations and in combination with specific manoeuvres commanded by the flight crew,” the directive reads.

“This condition, although never encountered during operations, if not corrected, could lead to excessive pitch attitude, possibly resulting in increased flight crew workload,” it continues.

As a result of the directive, Airbus has restricted the centre of gravity envelope with an Aircraft Flight Manual Temporary Revision which will prevent the aforementioned condition.

In simple terms, the centre of gravity of an aircraft is an average of where its weight is located. More weight at the front of the aircraft means that the centre of gravity will move forward, and vice-versa.

Centre of gravity could affect the aircraft’s handling, and aircraft manufacturers produce what is called an ‘envelope’ of the acceptable centre of gravity. If the centre of gravity exits this envelope, the aircraft may not handle as expected.

The directive applies to Airbus A320neo aircraft – more specifically, the A320-251N, A320-253N, A320-271N and A320-273N models.

Air Malta is one of 51 airlines across the globe which utilises this type of aircraft, and has three Airbus A320-251Ns in its fleet – 9H-NEO, 9H-NEB, and 9H-NEC. The first was delivered to the airline in June 2018, the second in July 2019, and the third just two weeks ago, on 12 September 2019.

However, questions sent by this newsroom to the national air carrier over a week ago asking what precautions had been taken as a result of the EASA’s directive and whether the directive would in any way affect future orders of the aircraft remained unanswered time of writing.

Currently, Air Malta has a fleet of 11 aircraft. Besides the new aircraft, the airline operates seven Airbus A320-200s and one Airbus A319.

The national carrier last year began embarking on a plan which will, by 2022, see its fleet fully replaced by A320neos.

While it is unclear what precautions the national carrier has taken, international media has reported that other airlines have employed various mitigation at the measures to deal with the issue, with the most common being to block off the last row of seats on the aircraft from being booked.

In fact, Lufthansa – which currently operates 20 A320neos – has blocked off the back row of the aircraft as a precaution, while British Airways has also done the same thing due to the this directive. According to the UK’s Daily Mail, budget airline EasyJet has chosen to change the way it loads luggage onto the plane rather than blocking off the last row of seats.