AD 59-17-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Helio Aircraft LLC | H-391B | Airworthiness Directives; Helio Models H-391B and H-395 Aircraft |
| aircraft | Helio Aircraft LLC | H-395 (USAF L-28A or U-10B) | Airworthiness Directives; Helio Models H-391B and H-395 Aircraft |
Unsafe Condition
Cracks around bolt holes and the 2.0-inch diameter lightening hole in the horizontal tail front spar splice plate (P/N 391-020-305) could lead to structural failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the horizontal tail front spar splice plate for cracks around bolt holes and the 2.0-inch diameter lightening hole. Replace with a 0.063-inch 4130 steel part if cracks are found. If no cracks, inspect every 25 hours until the next 100-hour inspection or October 1, 1959, then replace with steel part.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 10 hours unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Helio Models H-391B (except serial numbers 093, 094, 098) and H-395 (serial numbers 502 through 510)
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.