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
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Helio Models H-391B, H-395 (Serial Numbers 1 to 591), and H-395A (Serial Numbers 1 to 1008)
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Engine Breather
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_63-18-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 63-18-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Helio Models H-391B, H395 and H-395A Subject: Engine Breather Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/01/1963 Make: Helio Aircraft LLC Model: H-391B | H-395 (USAF L-28A or U-10B) | H-395A Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 63-18-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 63-18-02 SUBJECT HEADING: Airworthiness Directives; Helio Models H-391B, H395 and H-395A ACTION: SUMMARY: DATES: Effective September 1, 1963. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 63-18-02 HELIO: Amdt. 609 Part 507 Federal Register August 31, 1963. Applies to All Models H-391B, H-395 Serial Numbers 1 to 591, Inclusive, and H-395A Serial Numbers 1 to 1008, Inclusive. Compliance required prior to September 15, 1963. To preclude possible loss of engine oil through the vacuum oil separator due to blockage of the engine breather tube with ice or snow, accomplish the following: 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. This cut can be added to the present breather tube. (Helio Service Bulletin No. 30A dated April 20, 1963, covers this same subject.) This supersedes AD 62-12-05. This directive effective September 1, 1963. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_63-18-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 63-18-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Helio Models H-391B, H395 and H-395A Subject: Engine Breather Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/01/1963 Make: Helio Aircraft LLC Model: H-391B | H-395 (USAF L-28A or U-10B) | H-395A Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 63-18-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 63-18-02 SUBJECT HEADING: Airworthiness Directives; Helio Models H-391B, H395 and H-395A ACTION: SUMMARY: DATES: Effective September 1, 1963. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 63-18-02 HELIO: Amdt. 609 Part 507 Federal Register August 31, 1963. Applies to All Models H-391B, H-395 Serial Numbers 1 to 591, Inclusive, and H-395A Serial Numbers 1 to 1008, Inclusive. Compliance required prior to September 15, 1963. To preclude possible loss of engine oil through the vacuum oil separator due to blockage of the engine breather tube with ice or snow, accomplish the following: 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. This cut can be added to the present breather tube. (Helio Service Bulletin No. 30A dated April 20, 1963, covers this same subject.) This supersedes AD 62-12-05. This directive effective September 1, 1963. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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