AD 56-22-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Helio Aircraft LLC | H-391B | Airworthiness Directives; Helio Model H-391B Aircraft |
Unsafe Condition
Cracked upper wing attachment thrust washers, P/N HS-15, installed beneath the head of the bolt attaching the top of the front wing spar to the carry-through structure.
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Required Actions
Replace cracked upper wing attachment thrust washers P/N HS-15 with new improved type procured from the airplane manufacturer. Follow torque requirements specified in Helio Field Service Bulletin No. 13 dated July 18, 1956.
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Compliance Time
within next 100 hours
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Affected Aircraft
Helio Aircraft LLC Model H-391B Aircraft, Serial Numbers 003 to 029 Inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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