AD 96-09-29
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
Failure of the upper V-belt sheave (part numbers A170-1I/J or A170-2J) due to cracks in the flange, which could result in damage to other drive system components 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
Replace the upper V-belt sheave (P/N A170-1I/J or A170-2J) with an airworthy sheave (P/N A170-1 or A170-2) having a dimension ≤0.30 inch from the forward retainer plate to the sheave flange, following Robinson SB-77 paragraphs 2-15. Compliance must occur within 100 hours time-in-service or 60 calendar days, whichever comes first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours time-in-service (TIS) or 60 calendar days, whichever occurs first 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 upper V-belt sheave part numbers A170-1I/J or A170-2J installed, certificated in any category.
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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