AD 75-03-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | FH1100 Manufacturing Corporation | 1100 | Airworthiness Directives; Fairchild (Hiller) Model 1100 and FG-1100 Helicopters |
| aircraft | FH1100 Manufacturing Corporation | FH-1100 | Airworthiness Directives; Fairchild (Hiller) Model 1100 and FG-1100 Helicopters |
Unsafe Condition
Cracks in the tail fin spar channel, P/N 24-62030-7 or P/N 24-62030-43, in the area of the tail rotor gear box mount, P/N 24-62006-3.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the tail fin spar channel for cracks by removing the tail rotor gear box fairing and fin leading edge cover, cleaning the area with metachlor or equivalent, and using a ten power magnifying glass. Replace with an uncracked fin assembly or alter if cracks are found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next five hours in service after the effective date of this AD unless already accomplished within the last 95 hours in service and at every 100 hours in service thereafter
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Fairchild (Hiller) Model 1100 and FH1100 helicopters certificated in all categories.
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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