speed. At 2326:45, Moncton ACC instructed the aircraft to turn right (north) and proceed back to the OBVUP due to the landing traffic. The aircraft turned left (south).
After the aircraft turned left the flight path became erratic (see Figure 1). The aircraft changed heading numerous times with altitude deviations of up to 500 feet, which was consistent with the aircraft being flown manually (possibly while the GPS was being reprogrammed). During this period the airspeed did not substantially change. This erratic flight path continued for more than 4 minutes during which radio communications were maintained with both Moncton ACC and Charlottetown Radio. 5
Figure 1. Aircraft flight path
At 2328:00 Moncton ACC offered the aircraft the RNAV (GNSS) Runway 25 approach via the south initial waypoint (LERES) and instructed the aircraft to descend to 3000 feet asl. The pilot acknowledged the offer but declined to conduct the approach from the south; the aircraft did not descend. At 2329:06, after the other aircraft had landed and cleared the runway, Moncton ACC again instructed the pilot to descend to 3000 feet asl. Again the pilot acknowledged the instructions; however, the aircraft did not descend.
Charlottetown Radio is the remote communications outlet for the Sydney Airport.