AD 47-10-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
The absence of grounding jumpers between the engine autosyn transmitters and their support brackets could lead to electrical interference or shorts.
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Required Actions
Install 12 grounding jumpers between the engine autosyn transmitters and their support brackets as specified in LAC Service Bulletin 049/SB-20.
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Compliance Time
prior to March 15, 1947
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Affected Aircraft
Lockheed Aircraft Corporation Model 49-46, serial numbers 2021, 2022, 2026, 2027, 2028, 2034, and 2035.
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Federal Register Abstract
Engine Autosyn Transmitter Jumpers
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-10-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-10-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 49 Subject: Engine Autosyn Transmitter Jumpers Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 49-46 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-10-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-10-04 SUBJECT HEADING: LOCKHEED Model 49 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-10-04 LOCKHEED: (Was Mandatory Note 4 of AD-763-3.) Applies Only to Model 49 Serial Numbers 2021, 2022, 2026, 2027, 2028, 2034, and 2035. Compliance required prior to March 15, 1947. Add 12 grounding jumpers between the engine autosyn transmitters and their support brackets. (LAC Service Bulletin 049/SB-20 covers this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_47-10-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-10-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 49 Subject: Engine Autosyn Transmitter Jumpers Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 49-46 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: 47-10-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-10-04 SUBJECT HEADING: LOCKHEED Model 49 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-10-04 LOCKHEED: (Was Mandatory Note 4 of AD-763-3.) Applies Only to Model 49 Serial Numbers 2021, 2022, 2026, 2027, 2028, 2034, and 2035. Compliance required prior to March 15, 1947. Add 12 grounding jumpers between the engine autosyn transmitters and their support brackets. (LAC Service Bulletin 049/SB-20 covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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