The FAA proposes to adopt a new airworthiness directive (AD) for certain GE/Walter M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E-11S and M601F model turboprop engines. This proposed AD was prompted by the absence of life limits for propeller shaft part number (P/N) M601-6081.6 in the airworthiness limitation section of the applicable M601 Engine Shop Manual.
For M601D-11, M601E-11, M601E-11A, M601E-11AS and M601E-11S model turboprop engines, this proposed AD would require calculating the accumulated life of the propeller shaft and, depending on the number of accumulated flight hours, removal and replacement of the propeller shaft with a part eligible for installation. GE Aviation Czech Alert Service Bulletins listed in the proposed AD specify procedures for calculating the accumulated life of propeller shafts.
The FAA estimates that there are 14 engines in the U.S. that may be affected and require the replacement of the propeller shaft. To read the proposed AD or to comment, click here.
