Incident Overview
The aircraft involved was a Viscount 815, christened 'City of Dacca', which had been delivered just five months prior to the accident. It was operating a training flight from Karachi.
Sequence of Events
According to the investigation, the aircraft departed Karachi at 14:30 GMT for a training sortie. It returned to Karachi at 16:39 and then took off again at 16:48 for further training. At 17:07, the crew received clearance to land. During the approach, which was likely an Instrument Landing System (ILS) procedure, the aircraft was not properly aligned with the runway, prompting a go-around. On the second approach, the Viscount was observed flying very low over the runway with engines No. 3 and 4 inoperative. During the overshoot, the aircraft yawed almost 90 degrees to the right, causing the right wing to strike a blast pen wall. The aircraft then crashed in flames.
Casualties and Damage
Two crew members were killed, and a third occupant sustained injuries. The aircraft was destroyed by the impact and subsequent fire.
Investigation and Probable Cause
The official investigation determined that the trainee captain attempted a maneuver in disregard of the prescribed limitations. A two-engine overshoot was attempted at a very low height and below the prescribed minimum speed, when the aircraft was already committed to landing. This resulted in a violent yaw and sharp drop that could not be controlled. The training captain was conversant with the minimum requirements of a two-engine overshoot for the Viscount 815 but appears to have overestimated his own performance.