What happened
On 20 March 2000, at approximately 1847 UTC, a mid-air proximity incident occurred approximately 26.5 nautical miles north of Newcastle airport. The incident involved two aircraft: a Shorts SD3-60 100 series, registration G-OLAH, and a Tornado F3.
An aerial exercise was being conducted at the time, which had been communicated to relevant authorities via an Airspace Co-ordination Notice (ACN). This notice was distributed to the Air Traffic Control managers at both Aberdeen and Newcastle airports.
The investigation
During the review of the investigation findings, it was established that the Notice to Airmen (NOTAM) associated with the exercise did not come into effect until 1900 UTC. This means the NOTAM was not active for 13 minutes prior to the occurrence of the AIRPROX.
Furthermore, the investigation clarified the specific flight rules applicable to the operation. The requirement for pilots to maintain appropriate quadrantal levels and comply with the rules of the air was specified as maintaining VMC (Visual Meteorological Conditions) rather than VFR.