What happened
On January 31, 2006, a Hawker 800XP (registration HB-VNJ), operated by Johnson Controls AG, was performing a flight from Sliač, Slovakia, to Prague Ruzyně Airport (LKPR). During the approach, the pilot-in-command requested priority landing on runway 24 due to increased vibrations detected in the left engine.
Following a successful landing, the crew proceeded to taxi toward the "Sever" parking stand. While taxiing on taxiway L, the pilot shut down both engines and came to a halt. The pilot justified the engine shutdown by citing a continuing unusual noise originating from the left engine. This unscheduled stop resulted in the obstruction of taxiway L for approximately 30 minutes. After this period, the crew restarted the engines and continued taxiing to their designated parking position.
There were no injuries to the crew or passengers, and the aircraft sustained no damage during the incident.
The investigation
The ÚZPLN investigation focused on the source of the vibrations and the unusual noise reported by the crew. Investigators reviewed radio communications between the crew and Prague ATC, as well as the aircraft's maintenance records. A subsequent technical inspection by a maintenance organization was conducted to identify the mechanical fault.
Findings
- The primary cause of the vibrations and unusual noise was a mechanical failure of the starter-generator (P/N 230-005) on the left engine.
- The crew was properly qualified and medically fit for the flight.
- The aircraft was fully compliant with all airworthiness and insurance requirements.
- Weather conditions at the time of the incident were clear with a temperature of -8°C, and did not contribute to the event.