AD 66-01-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Allied Ag Cat Productions, Inc. | G-164 | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164A | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B-15T | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B-20T | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B-34T | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B (with 73 inch wing gap) | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164C | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164D | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164D (with 73 inch wing gap) | Airworthiness Directives; Grumman Model G-164 Series Airplanes |
Unsafe Condition
Loose propeller hubs due to unmatched propeller cone and spacer sets or improper propeller nut seating on crankshaft threads.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove propeller and check for matched cone and spacer sets; ensure AN 5008-20 cone with AN 5010-20 spacer (1.969 inch total) or No. 525-B cone with No. 30091 spacer (1.980 inch total). Verify propeller nut allows at least one full turn less when installed versus removed. Install Grumman spacer P/N A1600-99 if needed on Gulf Coast W-670-240 engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 25 hours' time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Grumman Model G-164 Series Airplanes equipped with J-5404/MA96K, SR-5404R/MA96K or SR-5404/MA96K propellers on Continental W-670 (R-670) Series, Gulf Coast W-670-240, and Jacobs R-755 and L-4M Series engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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