AD 98-21-09
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
Kinking of the flexible vent tube connecting the rigid vent tube to the main fuel tank, leading to fuel starvation, loss of engine power, and a subsequent forced landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install fuel tank vent tube(s) with modified attachment to the mast tube if not already done; install spring part number B408-2 into the flexible tube leading to the main fuel tank; and install spring part number B408-1 into the flexible tube leading to the auxiliary fuel tank if installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 25 hours time-in-service or 30 calendar days after the effective date of this AD, whichever occurs first
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Affected Aircraft
Robinson Helicopter Company Model R22 helicopters, serial numbers 0002 through 1451, inclusive, 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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