AD 66-27-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Allied Ag Cat Productions, Inc. | G-164 | Airworthiness Directives; Grumman Models G-164 and G-164A Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164A | Airworthiness Directives; Grumman Models G-164 and G-164A Airplanes |
Unsafe Condition
Failure of the elevator torque tube due to cracks where the inboard elevator rib is welded to the torque tube and between the two inboard blind rivets.
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Required Actions
Remove two inboard blind rivets, visually inspect the torque tube for cracks, install new rivets if no cracks are found, and modify the torque tube in accordance with Grumman Model G-164 Alert Service Bulletin No. 33 or equivalent. Repeat inspections at intervals not to exceed 100 hours' time in service until modified.
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Compliance Time
Within specified intervals based on time in service as of April 22, 1966: (a) 25 hours' time in service after April 22, 1966, for airplanes with 1,000+ hours; (b) 100 hours' time in service or before 1,025 hours, whichever comes first, for airplanes with 500-999 hours; (c) before 600 hours' time in service for airplanes with less than 500 hours. Inspections must also be repeated at intervals not exceeding 100 hours' time in service until modified.
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Affected Aircraft
Grumman Models G-164 and G-164A Airplanes with elevators having Serial Number 461 and below.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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