AD 77-07-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | FH1100 Manufacturing Corporation | 1100 | Airworthiness Directives; Fairchild (Hiller) Models 1100 and FH 1100 Helicopters |
| aircraft | FH1100 Manufacturing Corporation | FH-1100 | Airworthiness Directives; Fairchild (Hiller) Models 1100 and FH 1100 Helicopters |
Unsafe Condition
Improper surface finish in the bolt holes at each end of the tail rotor tension torsion bars, P/N's 24-55106 with serial numbers prior to 1922 or illegible serial numbers, could lead to cracking of the bar plates.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the tail rotor tension torsion bars in accordance with Fairchild FH-1100 Service Bulletin No. SBFH1100-55-2A or equivalent procedure approved by the FAA. Replace unacceptable bars with inspected and acceptable ones per the service bulletin or approved procedure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 25 hours in service after the effective date of this AD unless already accomplished
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Affected Aircraft
Fairchild (Hiller) Models 1100 and FH-1100 helicopters with tail rotor tension torsion bars P/N 24-55106 having serial numbers prior to 1922 or illegible serial numbers
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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