AD 63-18-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Helio Aircraft LLC | H-391B | Airworthiness Directives; Helio Models H-391B, H395 and H-395A |
| aircraft | Helio Aircraft LLC | H-395 (USAF L-28A or U-10B) | Airworthiness Directives; Helio Models H-391B, H395 and H-395A |
| aircraft | Helio Aircraft LLC | H-395A | Airworthiness Directives; Helio Models H-391B, H395 and H-395A |
Unsafe Condition
Possible loss of engine oil through the vacuum oil separator due to blockage of the engine breather tube with ice or snow.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the oil breather tube P/N 391-060-317 by slicing a flute cut 18 inches from contour of lower cowl 0.25 to 0.31 inch depth and 0.75 inch in height on aft side of tube.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to September 15, 1963
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Affected Aircraft
Helio Models H-391B, H-395 (Serial Numbers 1 to 591), and H-395A (Serial Numbers 1 to 1008)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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