AD 74-23-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 23 | Airworthiness Directives; Gates Learjet Model 23 and 24 Airplanes |
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; Gates Learjet Model 23 and 24 Airplanes |
Unsafe Condition
Shorting of the external power receptacle terminals and battery positive terminal to adjacent structure, control cables and equipment
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the external power receptacle terminals for sealing and install insulation as per Gates Learjet Service Bulletin SB-23/24-258 or approved revisions. Equivalent methods require approval from FAA's Engineering and Manufacturing Branch.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 10 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
Gates Learjet Model 23 (Serial Numbers 23-003, 23-005, 23-006, 23-008 through 23-099) and Model 24 (Serial Numbers 24-100 through 24-134)
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
External Power Receptacle
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-23-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-23-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Gates Learjet Model 23 and 24 Airplanes Subject: External Power Receptacle Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/05/1974 Make: Learjet Inc. Model: 23 | 24 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 74-23-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2000 AD NUMBER: 74-23-01 SUBJECT HEADING: Airworthiness Directives; Gates Learjet Model 23 and 24 Airplanes ACTION: SUMMARY: DATES: Effective November 5, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-23-01 GATES LEARJET: Amendment 39-2000. Applies to Model 23 (Serial Numbers 23-003, 23-005, 23-006, and 23-008 through 23-099) and Model 24 (Serial Numbers 24-100 through 24-134) airplanes. Compliance: Required within the next 10 hours' time in service after the effective date of this AD, unless already accomplished. To prevent possible shorting of the external power receptacle terminals and battery positive terminal to adjacent structure, control cables and equipment, accomplish the following: A) On Model 23 (Serial Numbers 23-003, 23-005, 23-006, 23-008 and 23-009) airplanes, check to determine if the battery quick disconnects are installed and visually inspect the external power receptacle terminals for sealing and if not installed and/or properly sealed, prior to further flight, comply with Gates Learjet Service Bulletin No. SB-23/24-258, or later approved revisions. B) On Model 23 (Serial Numbers 23-010 thru 23-099) and Model 24 (Special Numbers 24-100 thru 24-134) airplanes, visually inspect the external power receptacle terminals for sealing and if not properly sealed, prior to further flight, insulate the terminals in accordance with Gates Learjet Service Bulletin SB-23/24-258 or later approved revisions. C) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective November 5, 1974. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_74-23-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-23-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Gates Learjet Model 23 and 24 Airplanes Subject: External Power Receptacle Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/05/1974 Make: Learjet Inc. Model: 23 | 24 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: 74-23-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2000 AD NUMBER: 74-23-01 SUBJECT HEADING: Airworthiness Directives; Gates Learjet Model 23 and 24 Airplanes ACTION: SUMMARY: DATES: Effective November 5, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-23-01 GATES LEARJET: Amendment 39-2000. Applies to Model 23 (Serial Numbers 23-003, 23-005, 23-006, and 23-008 through 23-099) and Model 24 (Serial Numbers 24-100 through 24-134) airplanes. Compliance: Required within the next 10 hours' time in service after the effective date of this AD, unless already accomplished. To prevent possible shorting of the external power receptacle terminals and battery positive terminal to adjacent structure, control cables and equipment, accomplish the following: A) On Model 23 (Serial Numbers 23-003, 23-005, 23-006, 23-008 and 23-009) airplanes, check to determine if the battery quick disconnects are installed and visually inspect the external power receptacle terminals for sealing and if not installed and/or properly sealed, prior to further flight, comply with Gates Learjet Service Bulletin No. SB-23/24-258, or later approved revisions. B) On Model 23 (Serial Numbers 23-010 thru 23-099) and Model 24 (Special Numbers 24-100 thru 24-134) airplanes, visually inspect the external power receptacle terminals for sealing and if not properly sealed, prior to further flight, insulate the terminals in accordance with Gates Learjet Service Bulletin SB-23/24-258 or later approved revisions. C) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective November 5, 1974. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.