Accidente de Mucha Standard durante acrobacias en el aeródromo de Birrfeld resulta en la muerte del piloto
El 22 de mayo de 1970, un planeador Mucha Standard se estrelló durante un entrenamiento acrobático en el Aeródromo de Birrfeld en Suiza. El piloto realizaba una serie de maniobras cuando el planeador entró en una barrena a la izquierda desde una espiral pronunciada a baja altitud. El piloto no pudo recuperar la barrena y la aeronave impactó contra el suelo. El piloto sufrió heridas graves y falleció al día siguiente. El planeador fue destruido en el accidente.
- Aerotow aerobatic flight: During an aerobatic training flight after aerotow release at about 850 m above ground, the pilot began flying a left aerobatic test sequence in the Mucha Standard glider.
- Steep spiral with nose high: After an imperfect left renversement and a corrective turn back to the runway axis, the pilot initiated a left steep spiral with the glider’s nose slightly above the horizon, causing speed to decay.
- Low remaining altitude: By the time the glider entered the steep spiral and subsequent upset, the aircraft was already at relatively low altitude, leaving limited height for recovery.
- Turbulent, gusty conditions: The weather featured 10–20 kt winds with gusts up to 25–35 kt and local showers and thunderstorms, conditions that could have favored an uncommanded stall and spin entry.
- Unintended left spin: As airspeed decreased in the steep spiral, the glider stalled and entered an unintentional left spin.
- Partial spin recovery attempt: The pilot appears to have applied recovery inputs, briefly reducing the spin rate after about two turns, but did not fully stop the rotation and likely attempted to pull out at too low a speed, leading to continuation or re-entry into the spin.
- Crash - fatal: After a total of about five turns in the left spin, the glider impacted the ground at a nose-down attitude of roughly 35 degrees, fatally injuring the pilot and destroying the aircraft.