FAA Requires Inspections of 1,987 737 NG Aircraft Before Directive Takes Effect in November
Key Facts
The U.S. Federal Aviation Administration issued final airworthiness directive No. 2026-20-14, estimating that it covers 1,987 Boeing 737-family aircraft registered in the United States. The directive takes effect on November 23, 2026, giving operators time to arrange inspections and maintenance before the deadline. It covers the 737-600, -700, -700C, -800, -900 and -900ER models, and excludes the 737 MAX family. The action followed reports from operators of aircraft pitch oscillations that the agency linked to increased play in the horizontal stabilizer. The rule requires measuring play in the stabilizer pivot hinges and jackscrew, with follow-up actions depending on the measurement results.
The FAA said the unaddressed condition could lead to aerodynamic flutter, an oscillatory motion that could result in loss of control of the aircraft. The directive is based on reports of pitch oscillations, not on a description of an uncontrolled movement of the aircraft's nose. The inspection focuses on the amount of play in the horizontal stabilizer's right and left pivot hinges, as well as in the jackscrew that moves it. Depending on the measurements, the aircraft may require additional inspections or repair or replacement of worn parts. The technical procedures are based on a Boeing service bulletin issued on June 12, 2025, covering measurement, remeasurement when needed and treatment of worn parts.
The agency estimated that the initial inspection would require 6 labor hours per aircraft, using a labor rate of $85 per hour. That puts the cost of measurement at $510 per aircraft, with total estimated costs for U.S. operators of $1,013,370. The estimate does not include spare parts needed for repair or replacement; the FAA said it had not received definitive data to estimate those costs. Actual expenses could therefore exceed the cost of the initial inspection for aircraft where measurements reveal worn parts requiring corrective action. The agency said changes it made to the final text were minor editorial revisions and would not increase the economic burden on any operator.
The regulatory process began with a proposal published by the FAA on January 9, 2026, with February 23 set as the deadline for comments. During consultations, Canadian North asked to extend the initial inspection deadline from 12 to 36 months, saying that aligning the inspection with a routine heavy maintenance visit would allow time for planning and parts procurement and reduce unscheduled downtime. The agency rejected the extension, however, and kept the compliance schedule in the service bulletin. It said the specified deadlines ensure an acceptable level of safety for the fleet. The FAA then adopted the final directive in October, with minor editorial revisions to the proposal.
The bulletin's schedules include some phased inspections within 3,100 flight hours or within 6 months of the last inspection, depending on the applicable case. Repair or replacement may require a verification inspection before the aircraft returns to service. This means operators must monitor measurement results and bulletin requirements when scheduling maintenance, as well as complete the inspection within the compliance deadlines. The next regulatory date remains November 23, 2026, when the directive takes effect for the covered aircraft. These requirements are based on the final directive published by the FAA on October 19.