FAA Targets Wobbly Boeing 737 Parts to Prevent Mid-Air Jitters
Published Date: 1/9/2026
Proposed Rule
Summary
The FAA wants to make sure certain Boeing 737 planes don’t wobble dangerously in the air because of loose parts in the horizontal stabilizer. They’re asking airlines to check and fix these parts to keep flights safe. Comments on this plan are open until February 23, 2026, and fixing the issue might cost some money but will keep everyone flying smoothly.
Analyzed Economic Effects
3 provisions identified: 1 benefits, 2 costs, 0 mixed.
Mandatory Stabilizer Freeplay Checks
The FAA proposes a rule that would require operators of Boeing 737-600, -700, -700C, -800, -900, and -900ER airplanes to measure horizontal stabilizer pivot-hinge and jackscrew freeplay and do specified on-condition actions using Boeing Alert Requirements Bulletin 737-55A1104 RB, dated June 12, 2025. The rule is intended to address reports of pitch oscillations and reduce the risk of a flutter event that could lead to loss of control.
Inspection Cost per U.S. Airplane
The FAA estimates the required freeplay measurement will take 6 work-hours at $85 per hour, for a labor cost of $510 per airplane and $0 parts, and that 1,987 U.S.-registered airplanes would be affected, producing an estimated total cost to U.S. operators of $1,013,370. The estimated labor rate and total number affected are taken from the NPRM's cost table.
Possible Repair or Replacement Costs
If inspections find worn parts, operators may need to repeat measurements and replace or repair worn pivot hinges or jackscrew components. The FAA lists repeat measurement labor as 6 work-hours at $85 per hour and replacement labor as 1 work-hour at $85, but states it has no definitive data to estimate parts costs or how many airplanes will need replacements.
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Key Dates
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