AD 79-14-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes |
Unsafe Condition
Uncontrolled pressure buildup in the hydraulic system return lines which could reduce flight control capability.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the hydraulic system return filter module inlet shutoff valve assemblies per Lockheed Service Bulletin 093-29-069. Equivalent modifications may be approved by the Chief, Aircraft Engineering Division, FAA Western Region. Special flight permits may be issued under FAR 21.197 and 21.199 to operate the airplane to a base for modifications.
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Compliance Time
within the next 350 hours time in service
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Affected Aircraft
Lockheed Martin Corporation L-1011-385-1 series airplanes certificated in all categories
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Federal Register Abstract
Hydraulic System
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_79-14-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 79-14-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes Subject: Hydraulic System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/16/1978 Make: Lockheed Martin Corporation Model: L-1011-385-1 | L-1011-385-1-14 | L-1011-385-1-15 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 79-14-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3511 AD NUMBER: 79-14-03 SUBJECT HEADING: LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes ACTION: SUMMARY: DATES: Effective July 16, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 79-14-03 LOCKHEED CALIFORNIA: Amendment 39-3511. Applies to Lockheed L-1011-385-1 series airplanes certificated in all categories. Compliance required within the next 350 hours time in service, unless already accomplished. To prevent uncontrolled pressure buildup in the hydraulic system return lines and to maintain full flight control capability, accomplish the following: (a) Remove the hydraulic system return filter module inlet shutoff valve assemblies from the hydraulic system return filter modules per Lockheed Service Bulletin 093-29-069, dated June 27, 1979. (b) Equivalent modifications may be approved by the Chief, Aircraft Engineering Division, FAA Western Region. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a base to perform the required modifications. This amendment becomes effective July 16, 1978. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_79-14-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 79-14-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes Subject: Hydraulic System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/16/1978 Make: Lockheed Martin Corporation Model: L-1011-385-1 | L-1011-385-1-14 | L-1011-385-1-15 Product Type: Aircraft Product Subtype: Large 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: 79-14-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3511 AD NUMBER: 79-14-03 SUBJECT HEADING: LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes ACTION: SUMMARY: DATES: Effective July 16, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 79-14-03 LOCKHEED CALIFORNIA: Amendment 39-3511. Applies to Lockheed L-1011-385-1 series airplanes certificated in all categories. Compliance required within the next 350 hours time in service, unless already accomplished. To prevent uncontrolled pressure buildup in the hydraulic system return lines and to maintain full flight control capability, accomplish the following: (a) Remove the hydraulic system return filter module inlet shutoff valve assemblies from the hydraulic system return filter modules per Lockheed Service Bulletin 093-29-069, dated June 27, 1979. (b) Equivalent modifications may be approved by the Chief, Aircraft Engineering Division, FAA Western Region. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a base to perform the required modifications. This amendment becomes effective July 16, 1978. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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