FAA Targets Regional Jet Stabilizer Trim Gear for Inspections
Published Date: 4/15/2025
Proposed Rule
Summary
The FAA wants to make sure certain MHI RJ Aviation regional jets stay safe by checking and possibly replacing worn parts in their stabilizer trim system. This comes after a warning message showed a problem with a gear wheel that could wear out too soon. Owners need to inspect these parts soon and avoid using faulty ones, with comments on the plan due by May 30, 2025.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 1 costs, 0 mixed.
Inspections and Part Replacements Required for MHI RJ Jets
If you operate or maintain MHI RJ Aviation ULC Model CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, or CL-600-2E25 airplanes, the FAA would require you to inspect horizontal stabilizer trim actuator (HSTA) rubber bull gear (RBG) wheels for certain part numbers and replace affected wheels. The FAA estimates this proposed AD would affect 460 U.S.-registered airplanes, with an estimated 1-hour inspection cost of $85 per airplane (total $39,100) and possible on-condition replacement cost of up to $2,550 per affected product (the FAA estimates up to 32 affected parts in the fleet). The rule also prohibits installing affected parts under certain conditions as specified in Transport Canada AD CF-2024-25 (to be incorporated by reference).
Reduces Risk of Stabilizer Trim System Failure
The proposed AD addresses a reported event where worn teeth on an HSTA rubber bull gear wheel could cause premature wear and lead to failure of the horizontal stabilizer trim system. The FAA is proposing the AD to correct this unsafe condition on the listed MHI RJ airplane models to reduce the risk of stabilizer-trim failure.
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