Incident Overview
A maintenance run-up at Tunis-Carthage Airport resulted in a ground collision when an aircraft, under the control of engineers and mechanics, moved unexpectedly. The aircraft was parked for maintenance when the engines were started for a run-up procedure. As engine power was increased to 80%, the aircraft overran its wheel chocks and collided with a hangar. No injuries were reported, but the aircraft sustained damage beyond repair.
Probable Cause
According to the official investigation, the accident occurred because the maintenance crew forgot to set the parking brakes before starting the engines. This oversight allowed the aircraft to move forward when thrust was applied.
Sequence of Events
The aircraft was positioned on the maintenance apron at Tunis-Carthage Airport. Engineering staff were conducting an engine run-up, a routine check to verify engine performance. After engine start, the power was advanced to 80% of maximum thrust. At this point, the aircraft surged forward, passing over the wheel blocks that had been placed to prevent movement. It continued until it struck a hangar structure.
Damage and Injuries
The collision caused extensive structural damage to the aircraft, rendering it irreparable. There were no injuries to maintenance personnel or any other individuals in the vicinity. The hangar also sustained damage, though details are not specified.
Investigation Findings
Investigators determined that the parking brakes were not engaged prior to the run-up. The maintenance crew's failure to set the brakes was identified as the direct cause of the incident. No other factors were cited in the official findings.