AD 70-18-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | FH1100 Manufacturing Corporation | 1100 | Airworthiness Directives; Fairchild Hiller Model 1100 Series Helicopters |
Unsafe Condition
Failure of transmission vertical struts and mounts (P/N 24-28030-1 and -2) due to cracks in weld areas.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Strip epoxy paint from weld areas of transmission vertical struts and mounts using commercial paint stripper, dye penetrant inspect weld areas for cracks, replace any cracked parts before further flight, refinish stripped areas with two coats of zinc chromate, and repeat the procedure every 100 flight hours.
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Compliance Time
within the next 25 flight hours of the effective date of this A/D unless already accomplished
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Affected Aircraft
Fairchild Hiller Model 1100 series helicopters certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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