AD 59-17-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Helio Aircraft LLC | H-391B | Airworthiness Directives; Helio Model H-391B Aircraft and Model H-395 |
| aircraft | Helio Aircraft LLC | H-395 (USAF L-28A or U-10B) | Airworthiness Directives; Helio Model H-391B Aircraft and Model H-395 |
Unsafe Condition
Failure of the stabilator control system pulleys due to lack of adequate guards could result in cable wear and possible failure.
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Required Actions
Install additional pulley guards at three 3-inch stabilator control system pulleys located at specified positions: upper left-hand corner of the fuselage truss aft of the firewall, forward of the lower left-hand side of the instrument panel, and under the forward attach point of the vertical stabilizer in the aft portion of the tail cone.
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Compliance Time
within next 100 hours or by November 1, 1959, whichever occurs first
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Affected Aircraft
Helio Model H-391B Aircraft and Model H-395, Serial Number 075 and 502 Through 509 Inclusive
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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