What happened
On the afternoon of March 16, 1997, a Beagle A-109 Airdale, registration CS-ALV, was performing a recreational flight from Viseu municipal aerodrome. The aircraft, operated by Aeroclube Asas da Beira, was carrying a pilot and two passengers under Visual Flight Rules (VFR).
While flying over the Águeda area, the pilot performed a low pass over the Águeda airstrip. Following this pass, the pilot attempted a rapid and pronounced climb accompanied by a right bank. During this maneuver, the aircraft lost significant airspeed. Fearing a left-wing stall, the pilot attempted to level the wings and divert the aircraft toward the Águeda runway. However, the aircraft entered a left-hand spin. Due to the extremely low altitude, recovery was impossible. The aircraft struck the treetops and impacted the ground belly-first in a pine forest approximately 80 meters from the end of the runway. The impact ruptured the wing fuel tanks, causing a fire that destroyed the aircraft and spread to the surrounding vegetation.
The investigation
The investigation examined the flight history, the pilot's credentials, and the aircraft's maintenance status. The pilot held a valid Portuguese private pilot license and had significant flight experience. The CS-ALV was airworthy, with a valid certificate of airworthiness and a recent scheduled inspection completed in January 1997. Investigators also reviewed the wreckage, noting that while the fuselage, engine, and propeller survived the impact, the airframe was heavily charred by the subsequent fire.
Findings
- The pilot attempted a high-performance maneuver (a rapid climb and steep bank) that exceeded the aircraft's performance capabilities at the prevailing speed and altitude.
- The pilot's attempt to correct the aircraft's attitude by leveling the wings during the stall led to an unrecoverable left-hand spin.
- The three occupants sustained serious injuries but managed to evacuate the cabin before the fire fully engulfed the aircraft.
- The crash resulted in the total destruction of the aircraft and a localized forest fire.