AD 73-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Grumman American Aviation Corporation | G-21 | Airworthiness Directives; Grumman Model G-21 and G-21A Type Airplanes |
| aircraft | Grumman American Aviation Corporation | G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B) | Airworthiness Directives; Grumman Model G-21 and G-21A Type Airplanes |
Unsafe Condition
Failure of the elevator torque tube assembly P/N 12755, rudder torque tube assembly P/N 12756, L.H. and R.H. rudder pedal torque tube assemblies P/Ns 12757, 12758, and hinge support assembly P/N 12725 due to cracks and corrosion below the cockpit floor.
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Required Actions
Visually inspect assemblies for cracks and corrosion within one month after the effective date unless done within the last eleven months, then every twelve months. For assemblies with 3000 hours or 36 months in service, disassemble and inspect using visual, dye penetrant, or magnaflux methods within one month after effective date unless done in last 23 months, then every 2000 hours or 24 months. Repair or replace corroded parts and replace cracked parts with new or inspected parts before further flight.
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Compliance Time
Within one month after the effective date of this A.D. unless already accomplished within the last eleven months and thereafter at intervals not to exceed twelve months in service from the last inspection. For assemblies with 3000 hours or 36 months in service: within one month's time in service after the effective date unless already accomplished within the last 23 months and thereafter at intervals of 2000 hours in service but not exceeding 24 months in service.
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Affected Aircraft
Grumman Models G-21 and G-21A Type Airplanes (Army OA-9, Navy JRF-1 through JRF-6B under TC654)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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