Air Corsica grounds four new ATR planes after pilot headache reports

The immediate financial consequences are limited for now, covering just four aircraft from a 14-strong fleet at one French regional carrier. But the reputational and regulatory repercussions could be wider. The Pratt & Whitney engine involved is now the standard choice on new ATR turboprop deliveries and has been ordered by FedEx and IndiGo. Consequently, if the investigation points to a design defect instead of a fleet-specific problem, the fallout could affect RTX, Pratt & Whitney's parent, as well as Airbus and Leonardo, the joint owners of ATR. The episode also feeds into an ongoing, broader debate about bleed air systems used on most commercial jets, after a previous investigation found that leaks of engine oil and other fluids into aircraft air supplies had increased sharply over the last decade. For the moment, this is more a story about reputation and investigation than a market-moving event, but it merits attention given the size of ATR's order book for the new engine.

Summary:

• French airline Air Corsica has grounded four of its seven ATR turboprop aircraft out of a total 14 in its fleet over recent weeks, while ATR and engine maker Pratt & Whitney work to determine the cause
• Pilots reported repeatedly noticing odors linked to suspected fume events and experiencing migraines while operating the affected planes
• One of the grounded aircraft had been chartered by Airbus for shuttle flights between its western France factories and its southern headquarters; Air Corsica has reassigned other planes to keep those flights running
• Air Corsica stated that no causal link has been established between the reports and any specific technical cause and that it is cooperating with manufacturers to evaluate the issue
• The affected planes are less than four years old and feature a newer, more fuel-efficient Pratt & Whitney engine introduced at Air Corsica in 2022, the first application of that engine on ATR's regional turboprops
• ATR, a 50-50 joint venture between Airbus and Italy's Leonardo, said its root-cause investigation continues and that its aircraft are designed to meet regulatory safety standards; Pratt & Whitney and Airbus both declined to comment

French carrier Air Corsica has taken four of its seven ATR turboprop aircraft out of service in recent weeks. This followed repeated reports from pilots of fumes entering the cockpit and cabin, with some crew members experiencing migraines while flying, according to the Wall Street Journal. The airline, which operates a total of 14 aircraft, has pulled these planes while ATR and engine manufacturer Pratt & Whitney investigate.

Among the grounded planes was one chartered by Airbus for shuttle flights connecting its western France factories with its southern headquarters. Air Corsica has assigned other aircraft to keep those Airbus flights operational. In a statement, the airline said it is tracking issues with the air conditioning systems on its ATR turboprops and working with manufacturers to identify the underlying cause, adding that a formal causal link between the pilot reports and any specific technical source has not yet been established.

The affected aircraft are under four years old and use a newer, more fuel-efficient Pratt & Whitney engine that entered service with Air Corsica in 2022, marking its first use on ATR regional turboprops. This engine has become the default on new ATR deliveries and has been ordered by operators including FedEx and India's IndiGo. Consequently, if a broader design flaw rather than a problem unique to Air Corsica is found, the implications could be wider. An ATR spokeswoman, representing the joint venture between Airbus and Italy's Leonardo, said the company continues its root-cause analysis and that its aircraft are designed to meet regulatory safety standards. Spokespeople for Pratt & Whitney and Airbus declined to comment. One of the affected aircraft is now at ATR's Toulouse facility, where the manufacturer is conducting tests to identify the source of the reported fumes.

This incident occurs against a larger backdrop of a long-running dispute over so-called fume events, where oil leaking past engine seals is converted into toxic vapors that mix into the aircraft's air supply, a risk inherent in the bleed air systems used on nearly all commercial aircraft today. A separate Wall Street Journal investigation last year found that leaks of oil and other aircraft fluids into jet engines have surged over the past decade, and a recent Federal Aviation Administration study showed that even relatively small leaks can release levels of neurotoxic chemicals that exceed US occupational health exposure limits. It remains unclear whether the fumes reported at Air Corsica indicate an isolated issue at the airline or a deeper problem with the aircraft or its new engine.