AD 51-26-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lear, Inc. | Automatic Pilots | Airworthiness Directives; LEAR: Applies to All L-2 Series Automatic Pilots |
| appliance | Lear, Inc. | Automatic Pilots | Airworthiness Directives; LEAR: Applies to All L-2 Series Automatic Pilots |
Unsafe Condition
Servo clutches in L-2 Series autopilot servos may lack proper marking (green dot on shaft, green dot on nameplate, or yellow dot on clutch housing), indicating potential clutch failure or improper installation.
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Required Actions
Inspect all L-2 Series autopilot servos to check for the presence of green or yellow dots as specified. Replace any clutches not marked accordingly with replacement clutches supplied by Lear upon request.
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Compliance Time
next 100-hour airplane inspection, but not later than January 1, 1952
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Affected Aircraft
Lear, Inc. Automatic Pilots, models 121C, 121D, 121F, 121G, 121H, 121J, manufactured prior to March 1, 1952
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Federal Register Abstract
Automatic Pilots
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_51-26-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 51-26-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; LEAR: Applies to All L-2 Series Automatic Pilots Subject: Automatic Pilots Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lear, Inc. Model: Automatic Pilots Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 51-26-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 51-26-02 SUBJECT HEADING: Airworthiness Directives; LEAR: Applies to All L-2 Series Automatic Pilots ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 51-26-02 LEAR: Applies to All L-2 Series Automatic Pilots. Compliance required at next 100-hour airplane inspection, but not later than January 1, 1952. Inspect all L-2 Series autopilot servos to determine whether servo clutches have green dot on the shaft at the output end of servo capstan shaft, or a green dot on or below the servo nameplate, or a yellow dot on the clutch housing. All clutches not so marked must be replaced. Replacement clutches will be supplied by Lear upon request. (Lear Service Bulletin No. L-2-16 dated October 26, 1951, covers this same subject.) This applies only to Servo Models 121C, 121D, 121F, 121G, 121H, 121J, manufactured prior to March 1, 1952. Reference Lear Service Bulletin No. L-2-44, dated May 24, 1954. FOOTER:
Document Text
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AD Final Rules - DRS_51-26-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 51-26-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; LEAR: Applies to All L-2 Series Automatic Pilots Subject: Automatic Pilots Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lear, Inc. Model: Automatic Pilots Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 51-26-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 51-26-02 SUBJECT HEADING: Airworthiness Directives; LEAR: Applies to All L-2 Series Automatic Pilots ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 51-26-02 LEAR: Applies to All L-2 Series Automatic Pilots. Compliance required at next 100-hour airplane inspection, but not later than January 1, 1952. Inspect all L-2 Series autopilot servos to determine whether servo clutches have green dot on the shaft at the output end of servo capstan shaft, or a green dot on or below the servo nameplate, or a yellow dot on the clutch housing. All clutches not so marked must be replaced. Replacement clutches will be supplied by Lear upon request. (Lear Service Bulletin No. L-2-16 dated October 26, 1951, covers this same subject.) This applies only to Servo Models 121C, 121D, 121F, 121G, 121H, 121J, manufactured prior to March 1, 1952. Reference Lear Service Bulletin No. L-2-44, dated May 24, 1954. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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