What happened
On the night of 07 November 2010, a Cessna 150, registration ZS-PPD, departed from George aerodrome (FAGG) for a local training flight. The flight, conducted under visual flight rules, initially proceeded without incident. However, while cruising at 1500 feet above mean sea level, the pilot experienced a sudden loss of radio communication alongside a total failure of the aircraft's flight and engine instruments.
Unable to communicate with air traffic control, the pilot returned to George aerodrome and selected runway 1s1 for landing, as it was the only active runway clear of traffic. During the landing roll, the pilot lost control of the aircraft, causing it to veer left off the paved surface and onto the grass. The impact was severe, causing the aircraft to nose over and come to rest in an inverted position. While the pilot sustained minor injuries, the aircraft suffered substantial damage, including a broken nose strut, destroyed propeller, and damage to the wings and engine mounts.
The investigation
Investigators examined the aircraft's electrical system following the impact. The inspection revealed that the aircraft's alternator field switch had been left in the OFF position. This oversight meant the battery was not being recharged during flight. As the pilot utilized the aircraft's lights and radio, the battery eventually depleted entirely, leading to the loss of all electrical instruments and communications.
Findings
- The electrical system failure was directly caused by the alternator field switch being left OFF.
- The depletion of the battery was accelerated by the use of essential electrical components, such as lighting and radio, while the alternator was inactive.
- The pilot was flying with a valid license and medical certificate, and the aircraft's airworthiness was current.
- Weather conditions at the time of the accident were favorable, with clear visibility and light winds.