Overview
On 4 January 2003 at approximately 1330Z, a Piper PA-25-235 aircraft, registration ZS-NVF, operated by Cape West Aviation under Part 135 of the Civil Aviation Regulations, was involved in an accident near Green Point, Cape Town. The pilot, who held a valid commercial pilot licence and medical certificate but was not rated for banner towing, sustained serious injuries. The aircraft was extensively damaged.
Flight Details
The flight originated from Stellenbosch Aerodrome (FASH) after the aircraft had been refuelled to maximum capacity. The purpose of the flight was to tow a banner in the Green Point area. Meteorological information reported wind at 15–20 knots gusting to 30 knots with clear skies.
Accident Sequence
While flying over Camps Bay at approximately 300 ft above ground level (AGL) in fine weather conditions, the aircraft encountered turbulence and inverted. The pilot managed to return the aircraft to an upright attitude and decided to return to Stellenbosch. Shortly thereafter, the engine began running rough, steadily lost power, and eventually failed. The pilot executed a forced landing on an open field adjacent to Hamilton Sports Field in Green Point Commune. The pilot chose not to release the banner to avoid potential injuries to pupils on the ground.
Investigation
The engine was dismantled and inspected following the accident. Apart from damage attributable to the forced landing, no abnormal conditions that could have caused the loss of power or engine failure were found. The aircraft was properly maintained according to available documentation. The Civil Aviation Authority (CAA) audit status of the approved maintenance organisation could not be confirmed because the AMO file could not be located.
Probable Causes
The South African Civil Aviation Authority listed four probable causes: 1. Strong and gusty wind conditions, which considerably increase fuel consumption. 2. Increased drag from banner towing, further increasing fuel consumption. 3. The pilot's lack of a banner towing rating, with inexperience possibly contributing to miscalculations of fuel consumption and aircraft maneuverability. 4. Flying at 300 ft AGL, which left the pilot with virtually no options when the engine failed.