FAA to Boeing: Double-check those stabilizer nuts, folks!
Published Date: 4/15/2025
Proposed Rule
Summary
The FAA wants to make sure all Boeing 737 planes from certain models are safe by checking if some parts on the horizontal stabilizer trim actuator were properly tightened and installed. Airlines will need to review maintenance records and fix any issues found, helping keep flights safe without big costs or delays. Comments on this plan are open until May 30, 2025, so everyone can weigh in!
Analyzed Economic Effects
4 provisions identified: 0 benefits, 4 costs, 0 mixed.
Potential costly on‑condition repairs for HSTA
If inspections find problems, operators may need on-condition work: general visual inspections and torque checks up to 5 work-hours (up to $425), replacement of under-torqued nuts up to 2 work-hours (up to $170), or full HSTA replacement costing 3 work-hours ($255) plus $325,585 in parts for a total of $325,840 per product. The FAA could not determine how many aircraft will need these repairs.
AD applies to all listed 737 models (broader scope)
The proposed AD applies to all Boeing Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes (not limited to certain line numbers). The FAA expanded applicability because affected HSTA parts are rotable and could be installed later on airplanes that were originally delivered with acceptable parts.
Operators must review HSTA maintenance records
If your company operates Boeing 737-600/-700/-700C/-800/-900/-900ER airplanes, you must review maintenance records to see if an overhauled horizontal stabilizer trim actuator (HSTA) was inspected and corrective actions were done per Boeing Alert Requirements Bulletin 737-27A1330 RB (dated October 7, 2024). The FAA estimates the required records review takes 1 work-hour at $85 per airplane and would affect 2,060 U.S.-registered airplanes (total estimated cost $175,100).
Prohibition on using old AMM for overhauled HSTA installs
As of the AD effective date, no person may use Boeing AMM 27-41-81 dated earlier than January 6, 2024 to install an overhauled HSTA on any airplane. Maintenance organizations must use the January 6, 2024 (or later) AMM procedure for such installations.
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Key Dates
Department and Agencies
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