What happened
On November 2, 2008, at approximately 16:33 UTC, a Piper PA34-220T was conducting an instrument flight rules (IFR) approach to Graz Airport (LOWG). During the approach, the aircraft deviated from its intended flight path and impacted a forested area located west of the runway 35C approach centerline. The impact destroyed the aircraft, and all three occupants on board were killed.
The investigation
The Austrian Federal Safety Investigation Board (SUB) examined the flight path, the aircraft's technical condition, and the environmental factors present at the time of the accident. The investigation reviewed air traffic control records from Austro Control GmbH, witness statements, and the aircraft's maintenance history. Investigators focused on the transition from instrument meteorological conditions (IMC) to the impact, as well as the pilot's proficiency in night IFR operations and the aircraft's trim configuration.
Findings
- The primary cause of the accident was a deviation from the prescribed flight path resulting from a spiral descent while flying in instrument meteorological conditions.
- The pilot experienced spatial disorientation after entering clouds during night operations.
- The aircraft was found to be trimmed for the elevator in a manner that contributed to the loss of control.
- The pilot possessed limited experience conducting night IFR approaches and maneuvers within these specific weather conditions.
- There was an insufficient level of technical proficiency regarding the execution of approaches and missed approaches in night IMC, alongside an error in assessing these capabilities.
- The investigation noted that the pilot's impairment cannot be ruled out as a contributing factor to the flight path deviation.