Dundee Airport has been ordered to review its flight control procedures after two planes came within 50 feet of crashing above the airfield.
The incident was described as a “very near miss” by the UK Airprox Board.
The accident occurred on August 31 last year when a Piper Cherokee plane was coming into land.
As it reached 750 feet in the air the pilot spotted a Cessna 152 coming in from a different direction and had to take evasive action.
The board said the incident was caused by Dundee Air Traffic Control giving instructions which resulted in the Cessna pilot flying into the path of the Piper and that the Cessna pilot had not ensured adequate separation from the approach path.
The board has now ordered Dundee to review its departure and arrival procedures.
A spokesman for HIAL, which runs Dundee Airport, said: “Dundee Airport Air Traffic Controllers perform to the highest standards expected in the exercise of their licence to control aircraft. Safety of air traffic is paramount and Dundee Airport will continue to implement their departure procedures in order to ensure safe operations at all times.
“However, there are lessons to learn for all the parties concerned in this incident and we will ensure that this is the case.”