AD 84-18-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Robinson Helicopter Company | R22 | Airworthiness Directives; ROBINSON HELICOPTER COMPANY Model R-22 Series Helicopters |
| aircraft | Robinson Helicopter Company | R22 ALPHA | Airworthiness Directives; ROBINSON HELICOPTER COMPANY Model R-22 Series Helicopters |
Unsafe Condition
Main rotor gearbox failure due to bolt failure (including head separation) on the underside of the ring gear.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 15 hours time in service after the effective date, inspect all 12 bolt heads on the underside of the ring gear. If bolt failure is observed, replace the gearbox before further flight. If no failure is found, reinstall the sight glass. Additionally, within 200 hours time in service, modify the gearbox with Robinson Kit No. KI-37 to discontinue inspections. If the oil chip detector illuminates, perform the inspection before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 15 hours time in service after the effective date of this AD, unless already accomplished within the last 35 hours time in service, and thereafter at intervals not to exceed 50 hours time in service from the last inspection. The modification must be done within the next 200 hours time in service after the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Robinson Helicopter Company Model R-22 series helicopters with main rotor gearbox Part Number A006-1, Revision A through V.
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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