An Air India Boeing 787-8 descended to 200ft above sea level around 2.6nm before the runway while attempting to land at Hong Kong International airport on 20 October.
A preliminary report from Hong Kong’s Air Accident Investigation Authority (AAIA) states that the aircraft’s ground proximity warning system triggered an alert to the crew following a rapid descent and deviation from the normal glide path while it was on approach to land at runway 07R.
For a standard 3° glideslope an aircraft would typically be descending through 830ft at a distance of 2.6nm.
After the alert, the crew initiated a go-around and landed safely on the same runway. There were 197 passengers and 10 crew on board the jet, which is registered VT-ANE.
The report notes that the air traffic information service and air traffic controllers had alerted the crew of potential signal fluctuations from the instrument landing system.
Indications are that there was a 12kt wind at 80 degrees while visibility was 10km.
The AAIA has collected statements from the pilots involved, as well as air traffic control recordings, radar and meteorological data.