Investigators are probing an incident in which a Vietnam Airlines Boeing 787-9 executed a missed approach after being informed by air traffic control that the undercarriage was not deployed.

The aircraft had been operating to Melbourne on 19 September, having departed from Ho Chi Minh City.

“During approach to land, Melbourne air traffic control advised the crew that the aircraft’s landing-gear was observed not to be extended,” says the Australian Transport Safety Bureau.

The aircraft had been conducting its approach to runway 34, and executed a go-around.

Visibility at the time – around 08:04 – was good, and there was no adverse weather, according to meteorological data from the airport.

Investigators have not disclosed the altitude of the 787 or its distance from touchdown at the point when the undercarriage advisory was transmitted. The flight, after carrying out the missed approach, landed around 15min later.

The bureau says it will “obtain information from the flightcrew and additional information as required”.

It has identified the twinjet involved as VN-A870. The General Electric GEnx-powered aircraft was delivered to Vietnam Airlines in November 2016, according to Cirium fleets data.