AD 43-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC3A-S1C3G | DOUGLAS Model DC3A Aircraft |
| aircraft | The Boeing Company | DC3A-S1CG | DOUGLAS Model DC3A Aircraft |
| aircraft | The Boeing Company | DC3A-S4C4G | DOUGLAS Model DC3A Aircraft |
| aircraft | The Boeing Company | DC3A-SC3G | DOUGLAS Model DC3A Aircraft |
| aircraft | The Boeing Company | DC3A-SCG | DOUGLAS Model DC3A Aircraft |
Unsafe Condition
Cracks in elevator hinge brackets due to vibration-induced fatigue from engine speeds between 1,300 and 1,600 r.p.m.
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Required Actions
Inspect elevator hinge brackets during periodic inspections and replace if cracks are found. Avoid continuous engine operation between 1,300 and 1,600 r.p.m. during cruising flight, maintaining a minimum of 1,700 r.p.m.
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Compliance Time
At each periodic inspection
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Affected Aircraft
The Boeing Company DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG aircraft
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Federal Register Abstract
Elevator Hinge Brackets
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_43-12-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 43-12-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model DC3A Aircraft Subject: Elevator Hinge Brackets Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: DC3A-S1C3G | DC3A-S1CG | DC3A-S4C4G | DC3A-SC3G | DC3A-SCG Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 43-12-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 43-12-01 SUBJECT HEADING: DOUGLAS Model DC3A Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 43-12-01 DOUGLAS: (Was Service Note 4 of AD-669-3.) Applies to DC3A aircraft. At each periodic inspection, check the elevator hinge brackets and if cracks are present the brackets should be replaced. Due to the possibility of vibration causing fatigue failures, continuous operation of the airplanes in the range of engine speeds between 1,300 and 1,600 r.p.m. should be avoided. A minimum engine speed of 1,700 r.p.m. during cruising flight is recommended. (Douglas Service Letter dated January 15, 1943, covers this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_43-12-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 43-12-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model DC3A Aircraft Subject: Elevator Hinge Brackets Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: DC3A-S1C3G | DC3A-S1CG | DC3A-S4C4G | DC3A-SC3G | DC3A-SCG 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: 43-12-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 43-12-01 SUBJECT HEADING: DOUGLAS Model DC3A Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 43-12-01 DOUGLAS: (Was Service Note 4 of AD-669-3.) Applies to DC3A aircraft. At each periodic inspection, check the elevator hinge brackets and if cracks are present the brackets should be replaced. Due to the possibility of vibration causing fatigue failures, continuous operation of the airplanes in the range of engine speeds between 1,300 and 1,600 r.p.m. should be avoided. A minimum engine speed of 1,700 r.p.m. during cruising flight is recommended. (Douglas Service Letter dated January 15, 1943, covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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