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Howmet, an aircraft supplier, may stop orders if Trump tariffs are imposed.

According to a letter obtained by, Howmet Aerospace - which supplies parts for aircraft built by Airbus or Boeing - may stop some shipments in the event that tariffs announced by U.S. president Donald Trump are implemented.

Howmet, based in Pittsburgh, said that it had declared a force-majeure event. This is a legal term that allows contracting parties to escape their obligations when faced with unavoidable or unpredictable external circumstances.

Howmet wrote that it would be excused from providing any products or services impacted by the declared national emergency, and/or tariff executive order.

Howmet refused to comment.

Howmet supplies critical metal components to the $150 billion jetliner market.

Boeing and Airbus have not responded to requests for comment regarding the letter. Three industry sources claim that the letter was sent to multiple companies in the aerospace sector.

One source said that this was the first time a major aerospace firm had made a move like this since the announcement of tariffs.

Howmet's rare declaration of legal intent does not automatically mean that the supply will be stopped or disrupted, but it opens the door for the supplier to claim they cannot meet their contracts if affected by the emergency order.

The letter said that Howmet was willing to work with its customers, "including your interest in reducing the impact of the Tariff Executive Order for Howmet".

Three industry sources have said that a successful declaration of force majeure would ripple throughout the supply chain, as companies try to shift the burden.

This is just the latest twist in an already hard-hit supply chain for aerospace products. Some companies are now facing higher costs as a result of U.S. duties on imported steel and aluminum, along with new duties that will be imposed by other countries.

Trump announced tariffs ranging between 10% and around 50% on Wednesday. This escalated a dispute which has rattled investors, and fueled fears of an upcoming recession.

Two sources say that aerospace companies usually contest such maneuvers. They also add that the success or failure of Howmet’s move will depend on how unpredictable the tariffs are, especially since Trump mentioned them during his election campaign. (Reporting from Allison Lampert, in Montreal, and Tim Hepher, in Paris; editing by Joe Brock and Matthew Lewis.)

(source: Reuters)