OTTAWA—The Harper government’s decision to grant Bell Helicopter Canada a special weight exemption for one of its aircraft strained relations between Transport Canada and aviation safety regulators in the U.S. and Europe, federal documents show.

The declaration, involving the Bell model 429, was made over strenuous objections from the U.S. Federal Aviation Administration and the European Aviation Safety Agency EASA, which complained that Transport Canada kept them in the dark about the significant regulatory change.

The adjustment, also the subject of a court challenge, increased the maximum weight gross weight limit to 3,400 kilograms, and allowed Bell to enter and recently win a $172-million contract to provide 15 light helicopters to the coast guard.

Documents obtained by The Canadian Press under Access to Information showed both international agencies felt sandbagged prior to the easing of the weight restriction in December 2011.

“EASA expressed disappointment that we had not given them a heads up about this exemption and about our intention to consider it,” said a June 17, 2011, email from Transport Canada’s director of policy and regulatory authority.

Emails between the agencies say the exception has also given the Mirabel, Que.-based company, a subsidiary of U.S. conglomerate Textron, a competitive advantage in more than a dozen other countries around the world.

Days after the complaint, the department’s director of national aircraft certification wrote to the FAA that Canada have every intention of being “as transparent as possible” on a decision “we know may have repercussions on the rotocraft industry world.”

U.S. and European officials were deeply skeptical, worried about the impact on safety and wondered whether Canada was making the change to just please Bell. They were also uneasy about the secrecy and urged Canadian officials to bring the discussion out of the back rooms.

“We must also consider whether this is an industry-wide concern, or a single companies (sic) business concern,” said a U.S. official, whose name was censored from an email, dated July 7, 2011.

“In other words, what’s good for Bell may or may not be good for the industry. If it is an industry wide issue, we would welcome a public debate with industry and regulators to consider the need for future rulemaking.”

One day later, the Europeans added their voice saying: “It would be more beneficial to consider an open rule-making process.”

Bell president Barry Kohler said his company is not the only one that has been granted weight exemptions at one time or another.

He said the manufacturer is currently working with the FAA, EASA and the industry to modernize the regulations that govern this issue.

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The intent is to have rules that “more accurately meet the needs of modern rotorcraft operations in a way that will more efficiently introduce newer technologies that can improve safety,” he said in an email.

The added weight is critical for commercial clients, such as helicopter ambulance and law enforcement, “who need the increased range and load for emergency services, and is increasingly important in remote (and) rural areas.”

Editor’s Note: This article has been edited from a previously published version to correct the date of an email.