What happened
On 23 April 2006, a Skyranger 912S, registration G-PSKY, was conducting a private flight near Diggle, Oldham. Approximately 15 minutes after departing from Crosland Moor, the pilot performed a circling manoeuvre over a farmhouse. Upon attempting to climb following the turn, the engine failed to respond adequately, instead spluttering and losing the power necessary to maintain altitude.
While the pilot identified a suitable field for an emergency landing, the aircraft's length was deemed insufficient for a safe approach. The pilot attempted to use the remaining engine power to climb away, but the aircraft could not gain altitude. The aircraft subsequently struck a dry stone wall, bouncing before the nose wheel and main wheels came to rest on top of the wall. The pilot and passenger, both wearing appropriate safety harnesses, escaped the aircraft without injury, and no fire occurred.
The investigation
Investigators examined the engine and fuel systems to determine the cause of the power loss. The fuel used for the flight had been sourced from a local garage. Analysis of the fuel drain from both tanks showed no immediate signs of water contamination. However, a detailed inspection of the aircraft later identified the presence of water within the carburettor float bowls of both carburettors, as well as water and sediment settled at the bottom of both fuel tanks.
Findings
- The engine failure was caused by water and sediment contamination in the fuel system.
- The presence of water in the carburettor float bowls and fuel tanks was identified during post-accident inspections.
- It was noted that the aircraft was typically stored with partially full tanks, a practice that may have allowed condensate to accumulate in the tanks over time.