AD 75-27-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pilatus Aircraft Limited | PC-6 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6-H1 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350-H1 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/350-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A-H1 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/A-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/B-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/B1-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/B2-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/C-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
| aircraft | Pilatus Aircraft Limited | PC-6/C1-H2 | Airworthiness Directives; Pilatus Model PC-6 Airplanes |
Unsafe Condition
Hazardous fuel leaks developing at the elbow fittings connecting the fuel line to the fuel pump and carburetor, and a broken fuel line.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace aluminum fittings (AN 822-8D and AN 823-8D) with stainless steel fittings (MS 20822-8C and MS 20823-8C) or FAA-approved equivalents. Replace aluminum fuel line P/N 6238.0094.80 with stainless steel fuel line P/N 6238.0094.80C or FAA-approved equivalents.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours time in service after the effective date of this AD, unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pilatus Aircraft Limited Model PC-6 airplanes, serial numbers 685 and below (all variants) powered by Lycoming GSO-480-B1A6 engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Fuel Leak Fittings
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_75-27-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-27-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Pilatus Model PC-6 Airplanes Subject: Fuel Leak Fittings Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/19/1976 Make: Pilatus Aircraft Limited Model: PC-6 | PC-6-H1 | PC-6-H2 | PC-6/350 | PC-6/350-H1 | PC-6/350-H2 | PC-6/A | PC-6/A-H1 | PC-6/A-H2 | P...Show more 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 75-27-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2478 AD NUMBER: 75-27-06 SUBJECT HEADING: Airworthiness Directives; Pilatus Model PC-6 Airplanes ACTION: SUMMARY: DATES: Effective January 19, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-27-06 PILATUS AIRCRAFT LTD: Amendment 39-2478. Applies To Pilatus Model PC-6 airplanes, serial numbers 685 and below (all variants) manufactured by Pilatus Aircraft Ltd., powered by Lycoming GSO-480-B1A6 engines. NOTE: This AD does not apply to Pilatus PC-6 airplanes manufactured by Fairchild Hiller. Compliance is required within the next 100 hours time in service after the effective date of this AD, unless already accomplished. To prevent hazardous fuel leaks from developing at the elbow fittings connecting the fuel line to the fuel pump and carburetor and to prevent a broken fuel line, accomplish the following: (a) Replace aluminum fittings (AN 822-8D and AN 823-8D) with stainless steel fittings (MS 20822-8C and MS 20823-8C), or FAA-approved equivalents. (b) Replace aluminum fuel line P/N 6238.0094.80 with a stainless steel fuel line P/N 6238.0094.80C, or an FAA-approved equivalent. This amendment becomes effective on January 19, 1976. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_75-27-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-27-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Pilatus Model PC-6 Airplanes Subject: Fuel Leak Fittings Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/19/1976 Make: Pilatus Aircraft Limited Model: PC-6 | PC-6-H1 | PC-6-H2 | PC-6/350 | PC-6/350-H1 | PC-6/350-H2 | PC-6/A | PC-6/A-H1 | PC-6/A-H2 | P...Show more 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 75-27-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2478 AD NUMBER: 75-27-06 SUBJECT HEADING: Airworthiness Directives; Pilatus Model PC-6 Airplanes ACTION: SUMMARY: DATES: Effective January 19, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-27-06 PILATUS AIRCRAFT LTD: Amendment 39-2478. Applies To Pilatus Model PC-6 airplanes, serial numbers 685 and below (all variants) manufactured by Pilatus Aircraft Ltd., powered by Lycoming GSO-480-B1A6 engines. NOTE: This AD does not apply to Pilatus PC-6 airplanes manufactured by Fairchild Hiller. Compliance is required within the next 100 hours time in service after the effective date of this AD, unless already accomplished. To prevent hazardous fuel leaks from developing at the elbow fittings connecting the fuel line to the fuel pump and carburetor and to prevent a broken fuel line, accomplish the following: (a) Replace aluminum fittings (AN 822-8D and AN 823-8D) with stainless steel fittings (MS 20822-8C and MS 20823-8C), or FAA-approved equivalents. (b) Replace aluminum fuel line P/N 6238.0094.80 with a stainless steel fuel line P/N 6238.0094.80C, or an FAA-approved equivalent. This amendment becomes effective on January 19, 1976. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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