AD 78-26-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Allied Ag Cat Productions, Inc. | G-164 | Airworthiness Directives; Grumman Models G-164, G-164A, and G-164B Aircraft |
| aircraft | Allied Ag Cat Productions, Inc. | G-164A | Airworthiness Directives; Grumman Models G-164, G-164A, and G-164B Aircraft |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B | Airworthiness Directives; Grumman Models G-164, G-164A, and G-164B Aircraft |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B-15T | Airworthiness Directives; Grumman Models G-164, G-164A, and G-164B Aircraft |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B-20T | Airworthiness Directives; Grumman Models G-164, G-164A, and G-164B Aircraft |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B-34T | Airworthiness Directives; Grumman Models G-164, G-164A, and G-164B Aircraft |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B (with 73 inch wing gap) | Airworthiness Directives; Grumman Models G-164, G-164A, and G-164B Aircraft |
Unsafe Condition
Corrosion of the lower wing attachment fittings (P/N's A1050-1, -3, -4, -101, -102, -103, -104, -13, -19, -20, -411, -412 and 3050-13, -14, -15, -16) may lead to structural failure of the wing fittings.
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Required Actions
Visually inspect lower wing panel attachment fittings for corrosion within the next 25 hours in service and every 500 hours or six months, whichever comes first. Remove corrosion and wing if found, then ensure bushing alignment and fitting dimensions meet specified limits. Replace fittings if thickness or distance from edge falls below specified minimums.
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Compliance Time
Within the next 25 hours in service and thereafter at intervals not to exceed 500 hours in service or six months, whichever comes first, since the last inspection.
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Affected Aircraft
Grumman Models G-164 (S/N 001-400), G-164A (S/N 401 and up), G-164B (S/N 001 and up), including variants G-164B-15T, G-164B-20T, G-164B-34T, and G-164B with 73 inch wing gap, certificated in all categories, that have been in service for more than 500 hours or six months.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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