Airworthiness Directive · Amendment 39-17553 · General Electric Company Turbofan Engines
General Electric Company Turbofan Engines
This AD applies to all General Electric Company (GE) model GEnx-2B67B turbofan engines with booster anti-ice (BAI) air duct, part number (P/N) 2469M32G01, and support bracket, P/N 2469M46G01, installed.
We are adopting a new airworthiness directive (AD) for all General Electric Company (GE) model GEnx-2B67B turbofan engines with booster anti-ice (BAI) air duct, part number (P/N) 2469M32G01, and support bracket, P/N 2469M46G01, installed. This AD was prompted by reports of cracks in the BAI air duct. This AD requires initial and repetitive visual inspections of the BAI air duct, removal from service of the BAI air duct if it fails inspection and, as a mandatory terminating action, the installation of new BAI air duct support brackets. We are issuing this AD to prevent failure of the BAI air duct, resulting in an in-flight shutdown of one or more engines, loss of thrust control, and damage to the airplane.
(1) Perform an initial visual inspection of the BAI air duct, P/N 2469M32G01, for cracks prior to accumulating 400 cycles since new (CSN).
(2) Thereafter, repeat the visual inspection within every 100 cycles since last inspection.
(3) If cracks in the BAI air duct are found during any inspection required by this AD, remove the BAI air duct from service.
As mandatory terminating action to the repetitive inspection requirement of this AD, at the next removal of BAI air duct, P/N 2469M32G01, or if the BAI air duct is found cracked, after the effective date of this AD, do the following:
(1) Install new BAI air duct support brackets, P/Ns 2550M03G01, 2548M66G01, 2548M67P01, 2550M18G01, and 2550M17P01.
(2) Replace the BAI air duct with one that is eligible for installation.
For the purpose of this AD, a BAI air duct that is eligible for installation is one that has accumulated 25 CSN or fewer.
