AD 81-10-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | FH1100 Manufacturing Corporation | FH-1100 | Airworthiness Directive; HILLER AVIATION Models FH 1100 Series Helicopter |
Unsafe Condition
The upper controls support column may contact and damage the main rotor mast due to an undersized base flange (P/N 24-30210) with thickness less than 0.080 inches (0.090 ± 0.010 inches specification).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 10 calendar days from the AD effective date, inspect the support column (P/N 24-30208) base flange for undersized thickness per Hiller SB 30-9, Part 2, Subpart B. If undersized, replace the support column with a compliant part before further flight, inspect the main rotor mast for damage at the specified location and replace damaged masts. Verify replacement support columns comply with type design before return to service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next ten (10) calendar days from the effective date of this AD and prior to further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Hiller Aviation FH-1100 Series Helicopter, serial numbers 001 through 254
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.