FAA Proposed Airworthiness Directive Targets PW4000 Sensor Flaw Linked to Tailpipe Fires and In-Flight Shutdowns
Impact Assessment Rationale
The directive affects 210 US-registered aircraft requiring mandated sensor replacements at cost to operators, with prior incidents of in-flight shutdowns and tailpipe fires representing hull and liability exposure; however, no groundings are required and the remediation is structured around scheduled maintenance cycles, limiting acute loss potential.
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Geographic Zone Matches
1 active match
- TRIA Certified AreasRule-basedConfidence 100%
Geographic zone matches are RiskEvents spatial/analytical indicators, not coverage determinations or Lloyd's official classifications.
Summary
The FAA has issued a proposed airworthiness directive requiring replacement of pressure burner sensors on several Pratt & Whitney PW4000 turbofan variants following multiple incidents of tailpipe fires, loss of thrust control, and in-flight engine shutdowns. The directive would affect 210 US-registered aircraft including Boeing 747-400s, 767s, and MD-11 Freighters. Sensor deterioration causes erroneous readings leading to incorrect fuel commands. Pratt & Whitney has already issued service bulletins aligned with the proposed rule, and no groundings are anticipated.
This summary is AI-generated from linked source reports and may change as more information becomes available. See our correction policy for how to report errors.
Structured Intelligence
known
- FAA issued a proposed airworthiness directive on 22 May 2026 targeting PW4000 turbofan pressure burner sensors
- Multiple reports of tailpipe fire, loss of thrust control, and engine in-flight shutdown have occurred due to sensor deterioration
- 210 US-registered jets are affected, including Boeing 747-400s, 767s, and MD-11 Freighters
- The proposed AD would require sensor replacement or repair every 30,000 flight hours or 10 years
- Sensors already exceeding limits must be repaired or replaced within 10-30 months
- Pratt & Whitney has already issued service bulletins aligned with the FAA proposal
- No groundings are required; inspections will occur during scheduled overhauls
- FAA is accepting public comments for 45 days
reported
- Sensor deterioration leads to incorrect fuel commands via erroneous sensor readings within electronic engine control modules
uncertain
- Specific details of individual incidents have not been disclosed by the FAA
- The exact number of incidents that prompted the directive is not revealed
- Whether any incidents resulted in hull damage, injuries, or losses is not stated
Affected Countries
Key Entities
Sources
Trade Media
- FlightGlobal22 May 2026, 16:54
Timeline
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remediation: existing authoritative signal
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Initial Detection
The FAA has issued a proposed airworthiness directive requiring replacement of pressure burner sensors on several Pratt & Whitney PW4000 turbofan variants following multiple incidents of tailpipe fires, loss of thrust control, and in-flight engine shutdowns. The directive would affect 210 US-registered aircraft including Boeing 747-400s, 767s, and MD-11 Freighters. Sensor deterioration causes erroneous readings leading to incorrect fuel commands. Pratt & Whitney has already issued service bulletins aligned with the proposed rule, and no groundings are anticipated.
"This proposed AD was prompted by multiple reports of tailpipe fire, loss of thrust control and engine in-flight shutdown due to undetected deterioration of pressure burner sensors," says the FAA's proposal, released on 22 May.
Source: FlightGlobal (Trade Media) · View source