The global fleet of 128 Boeing 777s with PW4000s has been grounded since late February following a failure onboard a United 777 near Denver—the third PW4000-powered 777 in-service event in three years linked to a cracked fan blade.
More consistent reporting, better forecasting, and more proactive onboard risk-mitigation measures such as wearing seatbelts and protecting cabin crew are keys to reducing turbulence-related accidents and related injuries, an NTSB study on the issue found.
Global regulators and operators moved quickly to minimize the risk of another incident involving a Pratt & Whitney-powered Boeing 777, banning them from airspace or voluntarily pulling them from service while the FAA, Boeing, and Pratt develop immediate inspection parameters.
The Indonesian ministry of transport has ordered the inspection of all Boeing 737 Classics in the country—consisting of the 737-300,-400 and -500 variants—following the crash of Sriwijaya Air flight SJ182.
The NTSB is urging Brazil’s National Civil Aviation Agency (ANAC) and the FAA to mandate Embraer E-Jets control column wiring inspections, revamp maintenance procedures and review pitch-trim runaway checklists, based on preliminary findings in the probe of a November 2019 incident on board a Republic Airways E175.