From the official announcement by FAA ↗
If unaddressed, the condition could cause sudden engine shutdown during flight.
What is changing
According to an FAA announcement on August 17, 2026, the agency is proposing a new airworthiness directive applicable to all Rolls-Royce Deutschland Trent XWB-75, XWB-79, XWB-79B, and XWB-84 engines—the powerplants fitted to the Airbus A350 wide-body aircraft family. The proposal follows FAA recognition of reports of oil pressure differential lower than expected on operating engines. If unaddressed, this condition could cause a fire in the forward bearing compartment, risking sudden engine shutdown during flight or even simultaneous shutdown of both engines, degrading the aircraft's control capability.
The corrective action is to replace the oil conduit assembly on the forward bearing compartment housing with an improved version, while prohibiting installation of the old type on any engine. The FAA also proposes to incorporate the directive issued by the European Aviation Safety Agency (EASA) on March 14, 2024 into U.S. official documentation, effectively recognizing a measure that Europe had already implemented more than two years earlier.
Timeline and who is affected
The public comment deadline is October 1, 2026. The FAA estimates the proposal will affect 80 engines installed on aircraft registered in the United States, with an average cost of $6,672.50 per engine (comprising $297.50 in labor and $6,375 in parts), totaling $533,800 for U.S. operators. This remains a notice of proposed rulemaking and is not yet a binding final regulation.
Practical significance
For passengers, this represents one in a long series of safety directives targeting Rolls-Royce engines over the past decade. In 2018, Leeham News and Analysis noted that 32 Boeing 787 aircraft were grounded due to Trent 1000 engine failures, prompting the FAA and EASA to restrict single-engine flight time. By 2021, the FAA issued a directive requiring repeated ultrasonic inspection of low-pressure compressor fan blades on RB211 Trent 700 engines after EASA discovered cracking caused by maintenance processes. Even the RB211-535 variant used on Boeing 757s was once required to undergo inspection after seven cases of coolant system failure were documented.
This demonstrates that airworthiness directives are not uncommon for the Trent engine family in general, but rather part of the ongoing surveillance process as manufacturers and regulators identify technical weaknesses through real-world operational data.
See the official FAA announcement via the source link below.
Analysis
This process follows a familiar pattern: EASA identifies and addresses the issue first, and the FAA subsequently proposes applying similar measures to the fleet registered in the United States—exactly as the FAA did in 2016 when it proposed reducing usage cycle limits on high-pressure turbine disks in the Tay 650-15 engine, based on EASA's directive from 2015. This demonstrates that the aviation safety surveillance system between the two sides of the Atlantic operates through mutual learning rather than the U.S. always taking the lead. Following the comment period, the FAA typically publishes a final rule, which may retain the original terms or adjust implementation timelines based on feedback from airlines and manufacturers.
Diaspora Impact
This is a proposed directive and does not yet carry mandatory force, so passengers need take no action at this time. Airlines and aircraft owners with Trent XWB engines registered in the United States who wish to comment may submit remarks through the regulations.gov system using FAA docket number FAA-2026-8781, with a deadline of October 1, 2026, following the procedures outlined in 14 CFR 11.43 and 11.45. For passengers who regularly travel on wide-body aircraft with Trent engines on transpacific flights, this is an opportunity to understand that maintenance directives of this type are a normal part of the safety oversight system, not a sign of unsafe aircraft.
Bảo Nguyễn
Bảo Nguyễn founded Saigon Sentinel to give the Vietnamese diaspora truly independent, in-depth community coverage at a time when misinformation moves faster than fact-checks and the language barrier makes verification harder than it should be. He sets the editorial standards and quality controls that govern the reporting, chooses the subjects, writes and edits each article, reads it against its sources before publication, audits published output, and handles corrections.