FAA orders stabiliser checks on nearly 2,000 Boeing 737 NG jets

The US Federal Aviation Administration (FAA) has ordered inspections of nearly 2,000 Boeing 737 Next Generation aircraft after operators reported pitch oscillations linked to excessive looseness in the horizontal stabiliser mechanism. According to AeroTime, the airworthiness directive was published on 19 October 2026 and takes effect on 23 November 2026.

What the directive requires

Operators must measure movement in the stabiliser's pivot hinges and jackscrew, then carry out further checks, repairs or parts replacements depending on the findings. AeroTime reports that the FAA estimates 1,987 US-registered aircraft are affected. The directive covers the 737-600, -700, -700C, -800, -900 and -900ER. It does not apply to the 737 MAX.

The horizontal stabiliser is the movable surface on the tail that helps control the aircraft's nose-up or nose-down attitude. The FAA said the reported pitch oscillations were caused by excessive freeplay, meaning too much movement in the supporting mechanism. It warned that leaving the condition uncorrected could lead to flutter, a potentially dangerous vibration that can result in loss of control.

Airline requests rejected

The final rule follows a proposal published in January 2026 and uses inspection procedures from a Boeing bulletin dated 12 June 2025. During the comment period, some airlines asked for changes, AeroTime says.

• Canadian North asked for the initial inspection threshold to be extended from 12 to 36 months, so the work could coincide with heavy maintenance and allow more time to arrange parts and labour.
• United Airlines asked for longer repeat inspection intervals on aircraft fitted with replacement hinge bearings than on those with original parts.

The FAA rejected both requests, saying the schedule is needed to maintain an acceptable level of safety and that freeplay must be monitored whether parts are original, repaired or new. It said it would consider individual extension requests if operators provide sufficient evidence that an alternative schedule would remain safe.

Cost and scope

The FAA estimates the freeplay measurement will take six work-hours per aircraft, costing $510 at an assumed rate of $85 an hour, or roughly $1 million across the affected US fleet. Further inspections and repairs would add to this. The agency said it could not determine how many aircraft would need replacement components and had no definitive prices for worn parts.

What this means for travellers

The sources do not say which airlines will have to take aircraft out of service, nor whether schedules will change. The figure of 1,987 refers to US-registered aircraft only, and AeroTime does not list the affected carriers beyond the two that commented on the proposal. Passengers on 737-600, -700, -800 and -900 flights could in principle see aircraft swaps if inspections reveal parts needing replacement, but this has not been confirmed. The 737 MAX is not covered. Travellers concerned about a specific flight should check the aircraft type with their airline.

The measurement work is a relatively short task at six hours per aircraft, and the FAA has not indicated any immediate grounding.

Sources: AeroTime