AD 68-06-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | FH1100 Manufacturing Corporation | FH-1100 | Airworthiness Directives; Fairchild-Hiller Model FH-1100 Helicopters |
Unsafe Condition
Failure of the engine-to-transmission coupling shaft due to corrosion resulting from water contamination.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove Bendix coupling shaft P/N 19E49-3A, inspect for corrosion. If corrosion is found, replace with P/N 19E49-3B; if absent, modify per Fairchild Hiller Service Bulletin No. FH-1100-24-1 or equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.
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Compliance Time
Within the next 100 helicopter hours' time in service following the effective date of this AD
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Affected Aircraft
Fairchild-Hiller Model FH-1100 helicopters, serial numbers 10 thru 76 inclusive and 83.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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