The NTSB’s
guidance to Textron Aviation, current holder of the Hawker type certificate, recommended a review of the aircraft documentation provided to pilots on all airplanes on the A3EU type certificate. Updated guidance should, according to the agency, include the effects of wing deformities or contamination on stall behavior, including that tiny changes in wing shape can have dramatic effect, allowing stalls to commence before there's any indication from the aircraft, and include an abrupt roll. The NTSB recommends that any pilot conducting such a flight be trained on proper recovery procedures, beginning with sufficient altitude.
The NTSB also recommended Textron develop for the Hawker 700, 800, 800XP, 850XP, and 900XP a “clear and thorough” stall test plan; define manufacturer-authorized training and experience requirements to qualify pilots to conduct stall training; and review all other airplanes on the type certificate model for similar issues.
