Which Canadian maintenance entity may approve data for major repairs to U.S.-registered aircraft?

The correct understanding is that neither an Aviation Maintenance Engineer (AME) nor an Approved Maintenance Organization (AMO) has the authority to approve data for major repairs on U.S.-registered aircraft.

In general, while AMEs in Canada are qualified to perform maintenance and repairs, and AMOs are organizations approved to carry out maintenance, the approval of data for major repairs specifically for U.S.-registered aircraft is governed by the regulations of the Federal Aviation Administration (FAA) in the United States. U.S. regulations require that major repairs to U.S.-registered aircraft must comply with FAA standards, which typically would not allow for Canadian entities to grant approval of such data without proper authorization from the FAA.

Thus, while both AMEs and AMOs have important roles in aircraft maintenance, they do not possess the jurisdiction to approve repair data for U.S.-registered aircraft, leading to the conclusion that the correct answer is that neither can provide such approvals.