AD 95-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Robinson Helicopter Company | R22 | Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters |
| aircraft | Robinson Helicopter Company | R22 ALPHA | Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters |
| aircraft | Robinson Helicopter Company | R22 BETA | Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters |
| aircraft | Robinson Helicopter Company | R22 MARINER | Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters |
Unsafe Condition
The main rotor (M/R) mast spanner nuts may become loose due to under-torqued nuts and paint on the clamping surface of the M/R shaft, leading to failure of the M/R mast support structure and potential M/R separation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and disassemble the main rotor gearbox; measure the break-loose torque value of the upper spanner nut; replace the lock washers with part number A269-2; increase the torque values of both spanner nuts; reassemble and reinstall the gearbox; verify main rotor balance per the maintenance manual.
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
Robinson Helicopter Company Model R22 helicopters with main rotor gearbox part number A006-1, Revisions A through Z, manufactured or overhauled prior to June 15, 1992.
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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