AD 75-12-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED Model L-1011-385-1 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED Model L-1011-385-1 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED Model L-1011-385-1 Series Airplanes |
Unsafe Condition
Possible unwanted pitch-up while in the autoland mode due to Collins FCS-110 autopilot installation.
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Required Actions
Install a placard stating 'AUTOPILOT CMD MODE USE PROHIBITED BELOW 100' AGL' and notify flight crews of the operating limitation. Remove the limitation and placard after incorporating the auto flight pitch computer modification per Lockheed Service Bulletin 093-22-080 or FAA-approved revisions.
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Compliance Time
Effective 48 hours after receipt of this telegram
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Affected Aircraft
Lockheed Model L-1011-385-1 Series airplanes with Collins FCS-110 autopilot installed
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Federal Register Abstract
Auto Flight Pitch Computer
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_75-12-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-12-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model L-1011-385-1 Series Airplanes Subject: Auto Flight Pitch Computer Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/02/1975 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L-1011-385-1 | L-1011-385-1-14 | L-1011-385-1-15 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 75-12-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2349 AD NUMBER: 75-12-11 SUBJECT HEADING: LOCKHEED Model L-1011-385-1 Series Airplanes ACTION: SUMMARY: DATES: Effective September 2, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-12-11 LOCKHEED: Amendment 39-2234 as amended by Amendment 39-2349. Applies to L-1011-385-1 Series airplanes, certificated in all categories with Collins FCS-110 autopilot installed. To prevent possible unwanted pitch-up while in the autoland mode, accomplish the following: (1) Effective 48 hours after receipt of this telegram, the following operating limitation applies: 'Autopilot command mode use prohibited below 100 feet AGL', and a placard must be installed in plain view of the pilots stating: 'AUTOPILOT CMD MODE USE PROHIBITED BELOW 100' AGL'. (2) Operators shall, by the most immediate and practicable means, notify flight crews of the foregoing. (3) When an operator's entire fleet, including spares, incorporates the auto flight pitch computer modification described in Lockheed Service Bulletin 093-22-080, dated August 11, 1975, or later FAA-approved revisions, remove the operating limitation and placard. Amendment 39-2234 was effective 6-12-75 for all persons except those to whom it was made effective immediately by telegrams dated May 14, 1975. This amendment 39-2349 is effective September 2, 1975. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_75-12-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-12-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model L-1011-385-1 Series Airplanes Subject: Auto Flight Pitch Computer Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/02/1975 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: 75-12-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2349 AD NUMBER: 75-12-11 SUBJECT HEADING: LOCKHEED Model L-1011-385-1 Series Airplanes ACTION: SUMMARY: DATES: Effective September 2, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-12-11 LOCKHEED: Amendment 39-2234 as amended by Amendment 39-2349. Applies to L-1011-385-1 Series airplanes, certificated in all categories with Collins FCS-110 autopilot installed. To prevent possible unwanted pitch-up while in the autoland mode, accomplish the following: (1) Effective 48 hours after receipt of this telegram, the following operating limitation applies: 'Autopilot command mode use prohibited below 100 feet AGL', and a placard must be installed in plain view of the pilots stating: 'AUTOPILOT CMD MODE USE PROHIBITED BELOW 100' AGL'. (2) Operators shall, by the most immediate and practicable means, notify flight crews of the foregoing. (3) When an operator's entire fleet, including spares, incorporates the auto flight pitch computer modification described in Lockheed Service Bulletin 093-22-080, dated August 11, 1975, or later FAA-approved revisions, remove the operating limitation and placard. Amendment 39-2234 was effective 6-12-75 for all persons except those to whom it was made effective immediately by telegrams dated May 14, 1975. This amendment 39-2349 is effective September 2, 1975. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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