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FAA Targets PW4000 Sensor Flaw Linked to Tailpipe Fires

May 22, 2026

2 min read

Key Takeaways

FAA proposes airworthiness directive for PW4000 engines.
Directive targets pressure burner sensor flaw linked to tailpipe fires.
Affects 210 US-registered jets, including Boeing 747-400s and 767s.
Operators must replace sensors every 30,000 flight hours or 10 years.

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Strategic Implications

The FAA's proposed directive may indicate a growing concern about engine safety and reliability. The requirement for sensor replacement could suggest a significant maintenance burden for airlines, which may impact their operational costs and potentially influence future engine procurement decisions.

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What Happened

Regulator Proposes Mandatory Replacement of Pressure Burner Sensors

The Federal Aviation Administration has proposed an airworthiness directive to address a sensor durability problem affecting Pratt & Whitney PW4000 turbofans, which have experienced tailpipe fires and in-flight shutdowns. The directive would require airlines to replace pressure burner sensors on several PW4000 variants powering 210 US-registered jets, including Boeing 747-400s, 767s, and MD-11 Freighters. The proposed rule aims to prevent erroneous sensor readings that can cause incorrect fuel commands. This development was first reported by FlightGlobal.

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