Airworthiness Directive · Amendment 39-22422 · Propeller controlling system
Allied Ag Cat Productions, Inc. Airplanes
This AD applies to the following Allied Ag Cat Productions, Inc. airplanes, all serial numbers, certificated in any category.
(1) Model G-164A airplanes with Supplemental Type Certificate (STC) No. SA7769SW, SA7966SW, or SA8720SW installed.
(2) Model G-164B airplanes with STC No. SA7546SW, SA7966SW, SA7987SW, or SA8720SW installed.
The FAA is adopting a new airworthiness directive (AD) for Allied Ag Cat Productions, Inc. (Allied Ag Cat) Model G-164A and G-164B airplanes with certain supplemental type certificates (STCs) installed. This AD was prompted by an accident involving an Allied Ag Cat Model G- 164B airplane where the airplane's propeller pitch control (PPC) linkage detached from the PPC of the engine and resulted in an accident that significantly damaged the airplane and injured the pilot. This AD requires installing a secondary retention feature (bolt, washer, and safety wire) on the PPC lever and the PPC assembly. The FAA is issuing this AD to address the unsafe condition on these products.
Within 12 months after the effective date of this AD, install a secondary retention feature (bolt, washer, and safety wire) on the PPC lever and the PPC assembly. If rework of the PPC assembly (specifically, the shouldered shaft within the cam assembly within the PPC assembly) is required to do this installation, do the rework in accordance with the procedures in Section 3.C(3)(d)2 of Honeywell Service Bulletin TPE331-72-2190, Revision 0, dated December 21, 2011. After the rework is completed, re-identify the part number of the PPC assembly, cam assembly, and shouldered shaft, in accordance with Sections 3.C(4), 3.C(5), and 3.C(7), as applicable, of Honeywell Service Bulletin TPE331-72-2190, Revision 0, dated December 21, 2011.
Note 1 to paragraph (g): Honeywell TPE331 Propeller Pitch Control Lever letter, dated August 26, 2011, to the original equipment manufacturer, contains information related to this subject.
