The FAA has issued an airworthiness directive (AD) for Ag Cat G-164A and G-164B aircraft that have a Honeywell TPE331 series engine installed. This AD requires the installation of a secondary retention feature (bolt, washer and safety wire) between the aircraft’s propeller pitch control (PPC) linkage and the engine’s PPC assembly to prevent loosening and possible detachment.
This AD is effective June 21, 2023, and requires compliance prior to June 21, 2024. Honeywell issued a letter detailing how to install the secondary retention feature in 2011 (see photo below).
NAAA previously reported on this issue in June 2022 and October 2021.
View the full AD here.
 for Ag Cat G-164A and
G-164B aircraft that have a Honeywell TPE331 series engine installed.
This AD requires the installation of a secondary retention feature
(bolt, washer and safety wire) between the aircraft’s propeller pitch
control (PPC) linkage and the engine’s PPC assembly to prevent loosening
and possible detachment.){kind=small}
