The FAA has proposed adopting a new airworthiness directive (AD) for certain GE Aviation M601E–11AS, M601E‐11S, H75–100, H80–100 and H85–100 model turboprop engines. These engines are known to be installed on Air Tractor AT-400 and AT-500 series; Allied Ag Cat Productions Inc. (formerly Grumman) G-164 series; and Thrush Aircraft (formerly Quality, Ayres, Rockwell) 510G and S-2R series.
This proposed AD was prompted by reports of multiple failures of the needle bearing installed in propeller governors having part numbers (P/Ns) P–W11–1 or P–W11–2, caused by self-generated debris from the needle bearing, which led to oil contamination.
This proposed AD would require replacement of the affected propeller governors with a redesigned propeller governor having P/N P–W11–4 or P–W11–5.
The FAA is currently accepting comments on this proposed AD through May 22. View the complete proposed AD here.
 for
certain GE Aviation M601E–11AS, M601E‐11S, H75–100, H80–100 and H85–100
model turboprop engines. These engines are known to be installed on Air
Tractor AT-400 and AT-500 series; Allied Ag Cat Productions Inc.
(formerly Grumman) G-164 series; and Thrush Aircraft (formerly Quality,
Ayres, Rockwell) 510G and S-2R series.){kind=small}
