AD 76-18-07
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; Gates Learjet Models 24, 25, 35 and 36 Airplanes |
| aircraft | Learjet Inc. | 25 | Airworthiness Directives; Gates Learjet Models 24, 25, 35 and 36 Airplanes |
| aircraft | Learjet Inc. | 35 | Airworthiness Directives; Gates Learjet Models 24, 25, 35 and 36 Airplanes |
| aircraft | Learjet Inc. | 36 | Airworthiness Directives; Gates Learjet Models 24, 25, 35 and 36 Airplanes |
Unsafe Condition
Incorrect connection of the inverter input power wiring to the wrong power bus could result in electrical system malfunction.
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Required Actions
Perform an inverter operational check per Gates Learjet Service Bulletins SB 24/25-273 or SB 35/36-24-3. If the electrical system does not operate correctly, rewire the inverter input power wiring per applicable manufacturer's Service Manual Wiring Diagram and repeat the operational check. Equivalent methods must be approved by the FAA.
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Compliance Time
within the next 25 hours' time in service after the effective date of this AD
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Affected Aircraft
Gates Learjet Models 24 (Serial Numbers 24-230 thru 24-331 and 24-333); 25 (Serial Numbers 25-061 and 25-067 thru 25-207); 35 (Serial Numbers 35-001 thru 35-079); and 36 (Serial Numbers 36-001 thru 36-020)
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Federal Register Abstract
Inverter Input Power
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_76-18-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-18-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Gates Learjet Models 24, 25, 35 and 36 Airplanes Subject: Inverter Input Power Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/10/1976 Make: Learjet Inc. Model: 24 | 25 | 35 | 36 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 76-18-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2714 AD NUMBER: 76-18-07 SUBJECT HEADING: Airworthiness Directives; Gates Learjet Models 24, 25, 35 and 36 Airplanes ACTION: SUMMARY: DATES: Effective September 10, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-18-07 GATES LEARJET: Amendment 39-2714. Applies to Models 24 (Serial Numbers 24-230 thru 24-331 and 24-333); 25 (Serial Numbers 25-061 and 25-067 thru 25-207); 35 (Serial Numbers 35-001 thru 35-079); and 36 (Serial Numbers 36-001 thru 36-020) airplanes. Compliance: Required as indicated, unless already accomplished. To determine that each inverter is connected to the correct power bus, within the next 25 hours' time in service after the effective date of this AD, accomplish the following in accordance with Gates Learjet Service Bulletins SB 24/25-273, dated August 9, 1976, or SB 35/36-24-3, dated August 9, 1976, or later approved revisions, as applicable: A) Perform inverter operational check as outlined in the aforementioned Service Bulletins. B) If the electrical system does not operate as indicated re the operational checks required by Paragraph A, rewire the inverter input power wiring per the applicable manufacturer's Service Manual Wiring Diagram and repeat the operational check required by Paragraph A to verify proper operation of the electrical system. 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 September 10, 1976. FOOTER:
Document Text
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AD Final Rules - DRS_76-18-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-18-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Gates Learjet Models 24, 25, 35 and 36 Airplanes Subject: Inverter Input Power Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/10/1976 Make: Learjet Inc. Model: 24 | 25 | 35 | 36 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: 76-18-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2714 AD NUMBER: 76-18-07 SUBJECT HEADING: Airworthiness Directives; Gates Learjet Models 24, 25, 35 and 36 Airplanes ACTION: SUMMARY: DATES: Effective September 10, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-18-07 GATES LEARJET: Amendment 39-2714. Applies to Models 24 (Serial Numbers 24-230 thru 24-331 and 24-333); 25 (Serial Numbers 25-061 and 25-067 thru 25-207); 35 (Serial Numbers 35-001 thru 35-079); and 36 (Serial Numbers 36-001 thru 36-020) airplanes. Compliance: Required as indicated, unless already accomplished. To determine that each inverter is connected to the correct power bus, within the next 25 hours' time in service after the effective date of this AD, accomplish the following in accordance with Gates Learjet Service Bulletins SB 24/25-273, dated August 9, 1976, or SB 35/36-24-3, dated August 9, 1976, or later approved revisions, as applicable: A) Perform inverter operational check as outlined in the aforementioned Service Bulletins. B) If the electrical system does not operate as indicated re the operational checks required by Paragraph A, rewire the inverter input power wiring per the applicable manufacturer's Service Manual Wiring Diagram and repeat the operational check required by Paragraph A to verify proper operation of the electrical system. 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 September 10, 1976. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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