https://www.rtx.com/prattwhitney/newsroom/multimedia/pw4000-100-engine
PW4000-100" Engine | Pratt & Whitney
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https://aviationweek.com/air-transport/aircraft-propulsion/ntsb-united-pw4000-shutdown-linked-fan-blade-loss
NTSB: United PW4000 shutdown linked to fan blade loss | Aviation Week
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https://en.wikipedia.org/wiki/Pratt_%26_Whitney_PW4000
Pratt & Whitney PW4000 - Wikipedia
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https://www.newswire.com/news/chromalloy-signs-exclusive-pw4000-agreement-with-aar-22529905
Chromalloy Signs Exclusive PW4000 Agreement With AAR | Newswire
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https://www.mhi.com/business/products-services/aviation/civil-aeroengines/pw4000-turbofan-engine
PW4000 Turbofan Engine | Mitsubishi Heavy Industries
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