FAA Orders Boeing 737 Checks After Horizontal Stabilizer Wobble
Published Date: 10/19/2026
Rule
Summary
The FAA is rolling out a new safety rule for certain Boeing 737 planes to fix a problem where the horizontal stabilizer can wobble too much, causing pitch issues. Airlines must check and fix the stabilizer parts by November 23, 2026, to keep flights safe. This update helps prevent unsafe flying conditions and might cost some time and money for inspections and repairs.
Analyzed Economic Effects
5 provisions identified: 2 benefits, 3 costs, 0 mixed.
Mandatory freeplay inspection for Boeing 737s
If you operate certain Boeing Model 737-600, -700, -700C, -800, -900, or -900ER airplanes, you must measure horizontal stabilizer pivot-hinge and jackscrew freeplay and perform required on-condition actions per Boeing Alert Requirements Bulletin 737-55A1104 RB, dated June 12, 2025. These actions become required as of November 23, 2026, and on-condition actions can include repeating measurements, determining total freeplay, and replacing or repairing worn parts.
Estimated inspection cost per airplane
The FAA estimates the basic freeplay measurement takes 6 work-hours at $85/hour for a cost of $510 per airplane. The FAA estimates the AD affects 1,987 U.S.-registered airplanes, for a total estimated U.S. operator cost of $1,013,370 for the required measurements.
Potential on-condition and repair costs
If inspections find issues, the FAA estimates a repeat freeplay measurement costs $510 (6 work-hours x $85/hour) and replacement or repair labor is estimated at 1 work-hour ($85); parts cost for worn parts is not estimated. The FAA states it cannot determine how many airplanes will need replacements.
Operators may seek alternative compliance (AMOC)
Operators may request Alternative Methods of Compliance (AMOCs) under 14 CFR 39.19; the Manager, AIR-520, Continued Operational Safety Branch, FAA, can approve AMOCs. The Boeing Organization Designation Authorization (ODA) may approve certain repairs or deviations if authorized and if the approval specifically refers to this AD.
FAA finds no significant small-entity impact
The FAA certifies that this AD "will not have a significant economic impact, positive or negative, on a substantial number of small entities" under the Regulatory Flexibility Act.
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