The FAA is adopting a new airworthiness directive (AD) for certain GE Aviation M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E-11S, M601F, H75-100, H75-200, H80, H80-100, H80-200, H85-100 and H85-200 model turboprop engines. This AD was prompted by reports of cracks in dilution tube weld areas of the combustion chamber outer liner. The AD requires initial and repetitive borescope inspections of the dilution tube weld areas of the combustion chamber outer liner and, depending on the results of the inspections, replacement of the combustion chamber outer liner with a part eligible for installation.
This AD was first proposed on Sept. 27, 2022. Action is required at the next 300-hour (Type 3) engine inspection or within 25 flight hours (FHs) after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 300 FHs.
The effective date of this AD is Jan. 26, 2023. View the complete AD here.
 for certain GE
Aviation M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E-11S, M601F,
H75-100, H75-200, H80, H80-100, H80-200, H85-100 and H85-200 model
turboprop engines. Reports of cracks in dilution
tube weld areas of the combustion chamber outer liner prompted this AD.){kind=small}
