AAIB UK issued two safety recommendations following their investigation into an icing incident involving a Jetstream 41.
The aircraft departed Aberdeen in snow and freezing conditions, but had not been de-iced and anti-iced appropriately. During the climb the elevator became jammed by ice. The crew used changes in power and higher forces on the elevator controls to gain sufficient control to descend into warmer air, where the ice melted. The investigation also identified that the commander’s fitness to fly, coupled with pressures he may have felt to operate the flight, may have been contributory factors in the incident.
Safety Recommendation 2009-077
It is recommended that BAE Systems review the emergency and abnormal checklist for the Jetstream 41 aircraft to ensure that it includes adequate instruction and advice for flight crews who encounter in-flight control problems associated with airframe ice.
Safety Recommendation 2009-078
It is recommended that BAE Systems review the advice contained in the emergency and abnormal checklist concerning flap extension following failure of the aircraft’s ice protection systems, or when ice is present on the airframe, to ensure that advice and instruction relating to flap extension is optimized for safety.