Investigation led by AAIB - Islamic Republic of Iran

Serious incident to the Airbus A350 registered A7-ANO operated by Qatar Airways and to the McDonnell Douglas MD83 registered EP-CAS operated by Caspian Airlines on 12/04/2021 en route

Preliminary data based on the notification from the Islamic Republic of Iran authorities:

Due to auto pilot malfunction aircraft (MD83) climbed 400 feet above cleared level and caused RA and A350 got speed alert (stall Warning) while climbing .