French investigators are probing a serious approach incident involving a misaligned Hop Bombardier CRJ700 at Lyon earlier this month.

The aircraft had been operating from Lille on 23 January and was conducting the approach – about 25min before sunrise – to runway 35R.

Meteorological data from Lyon shows freezing fog and visibility down to 400m, with the runway visual range for 35R at 275m and falling.

French investigation authority BEA says the airport was operating under low-visibility procedures and the CRJ700 was carrying out an ILS Category III approach.

But the authority says the aircraft “deviated to the left” during the final approach and the crew aborted the landing.

The jet subsequently flew over the threshold of the parallel runway 35L as well as the “aerodrome facilities”, without elaborating.

Cirium fleets data lists the aircraft involved (F-GRZL) as having been delivered new to the Air France regional division in 2006.