Summary
The FAA proposes to revise an existing airworthiness directive (AD) that applies to certain Boeing Model 737-600, -700, -700C, and - 800 series airplanes. The existing AD currently requires inspecting/ measuring the length of the attachment fasteners between the nacelle support fittings and the lower wing skin panels, and related investigative/corrective actions if necessary. This proposed AD would correct errors found in the existing AD. This proposed AD results from detection of those inadvertent errors. We are proposing this AD to prevent inadequate fastener clamp-up, which could result in cracking of the fastener holes, cracking along the lower wing skin panels, fuel leaking from the wing fuel tanks onto the engines, and possible fire.