Airworthiness Directive · Amendment 39-10420 · CFM International CFM56-2, -3, -3B, and -3C Series Turbofan Engines
CFM International CFM56-2, -3, -3B, and -3C Series Turbofan Engines
CFM International CFM56-2, -3, -3B, and -3C series turbofan engines installed on, but not limited to, McDonnell Douglas DC-8 series and Boeing 737 series aircraft.
This amendment adopts a new airworthiness directive (AD) that is applicable to CFM International CFM56-2, -3, -3B, and -3C series turbofan engines. This action requires the removal from service of certain No. 3 bearing rear stationary air/oil seals, replacement with serviceable parts, and the installation of retention bushings. This action also requires the removal from service of high pressure compressor rotor (HPCR) stage 1-2 spools that have contacted the outer cone of the seal. This amendment is prompted by several reports of outer cone separation of the No. 3 bearing rear stationary air/oil seal. The actions specified in this AD are intended to prevent rubs between the outer cone of the No. 3 bearing rear stationary air/oil seal and the HPCR stage 1-2 spool, which could result in a potential uncontained failure of the HPCR stage 1-2 spool, and damage to the aircraft.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
