The Federal Aviation Administration has proposed tighter inspection and maintenance requirements for certain Boeing 787 airplanes after receiving additional reports of corrosion. The proposal matters because the agency says undetected corrosion could weaken the structure supporting the vertical fin.
Key Facts
- Federal proposal: The measure covers certain Boeing 787-8, 787-9 and 787-10 airplanes.
- Estimated scope: The FAA estimates that 116 U.S.-registered airplanes would be affected.
- Current status: The proposal is not final, and comments are due September 28, 2026.
- Existing requirements: Airworthiness Directive 2022-15-01 remains in effect.
What the FAA proposed
The notice is a proposed rule, not a new binding airworthiness directive. If adopted, it would supersede Airworthiness Directive 2022-15-01 for covered airplanes.
The proposal would retain certain existing inspection and maintenance duties while shortening some compliance periods. For certain airplanes, operators would also review records to determine whether the correct sealant method was used.
Follow-up work would depend on the records and inspection results. It could include inspections, repairs, new bolts or barrel nuts, sealant and finish work, or maintenance-program revisions.
Why the FAA wants a change
The FAA said optional sealants permitted under the earlier directive may not allow enough time to install all bolts. The agency said fastener installation could damage the sealant and make the earlier work ineffective.
The FAA also said it received additional corrosion reports after issuing the 2022 directive. In some cases, the reported corrosion was more severe than expected.
The agency described the condition as an aviation-safety risk. It said undetected corrosion could reduce structural strength, contribute to loss of the vertical fin and cause loss of airplane control.
Which airplanes could be affected
The proposal applies only to specified Boeing 787-8, 787-9 and 787-10 airplanes. It does not establish that every 787 has corrosion or an incorrect sealant installation.
The FAA estimates that 116 U.S.-registered airplanes would be covered. Its cost table estimates up to $4,438,160 for sealant inspection and bolt-and-nut installation across U.S. operators.
Boeing issued the technical requirements bulletin cited in the proposal on March 11, 2026. The FAA reviewed that material and proposes to require its actions, subject to exceptions in the proposed regulatory text.
What remains in effect
AD 2022-15-01 requires covered operators to inspect vertical-fin tension-bolt holes, review maintenance procedures and records, and complete applicable corrective work.
The 2026 notice does not replace those requirements now. A superseding directive would become binding only if the FAA completes the rulemaking and publishes a final action with an effective date.
TheFirstFile’s aviation law guide provides broader background on the federal regulatory framework.
What happens next
The FAA will accept comments in Docket FAA-2026-7234 through September 28, 2026. The agency said it will consider timely comments and may change the proposal in response.
The current record does not set a date for a final rule. Any final directive could differ from the proposal.
