UA328 Boeing 777-200 (Image: NTSB/Public Domain)
Air Safety

FAA orders thermal checks on PW4000 compressor fans

The Federal Aviation Administration (FAA) has issued an emergency airworthiness directive (AD #2021-05-51) ordering US operators of Boeing 777 aircraft powered by Pratt & Whitney PW4000-112 engines to carry out thermal checks on compressor blades before allowing them to return to service. The directive comes after initial findings by the [read more]

UA328 Boeing 777-200 (Image: NTSB/Public Domain)
Engineering, Leasing & Finance

UA328: Initial NTSB findings show metal fatigue

Initial inspections of the Pratt & Whitney PW4000-112 engine that caught fire on flight UA328 on Saturday have found that Turbine Blade No11 sheared off at the root “likely caused by metal fatigue”. Turbine Blade 10 was also sheared mid-way along its length, probably after being hit by Blade 11. [read more]

United Airlines Boeing 777 (File Image)
Civil Aviation

Pratt & Whitney powered 777s grounded

Boeing has recommended that any airline flying the Pratt & Whitney 4000-112 powered Boeing 777 should ground them pending an investigation into the United Airlines flight which suffered an uncontained engine failure on Saturday. United Airlines,  Korean Air, Asiana Airlines, All Nippon Airways and Japan Airlines all operate the type of [read more]