AD 99-02-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Robinson Helicopter Company | R22 | Airworthiness Directives; Robinson Helicopter Company (RHC) Model R22 Helicopters |
| aircraft | Robinson Helicopter Company | R22 ALPHA | Airworthiness Directives; Robinson Helicopter Company (RHC) Model R22 Helicopters |
| aircraft | Robinson Helicopter Company | R22 BETA | Airworthiness Directives; Robinson Helicopter Company (RHC) Model R22 Helicopters |
| aircraft | Robinson Helicopter Company | R22 MARINER | Airworthiness Directives; Robinson Helicopter Company (RHC) Model R22 Helicopters |
Unsafe Condition
Failure of the forward flexplate (flexplate), part number A947-1 A through D or A193-1, could result in failure of the main rotor drive system and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and replace the flexplate with an airworthy flexplate, P/N A947-1 E or F, including supporting the clutch shaft, installing washers under the nut, inspecting sheave alignment and clutch shaft angle, and reinstalling shims.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 25 hours time-in-service (TIS) or 15 calendar days, whichever occurs first
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Robinson Helicopter Company Model R22 helicopters with forward flexplate part number A947-1 A through D or A193-1 installed
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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