FAA 2023-25-03

Requires a one-time detailed inspection of the horizontal stabilizer central box for corrosion; an assessment of the corrosion level; depending on the determination, repetitive detailed inspections of the central box for corrosion and the internal composite structure for surface cracks, distortion, and damage; and repair or replacement of the horizontal stabilizer assembly. Repair or replacement of the horizontal stabilizer assembly is a terminating action for the repetitive inspections. Prompted by a report of corrosion on the various aluminum alloy reinforcements in the horizontal stabilizer central box caused by a humid environment inside the box from water ingress and/or condensation.