AD 50-46-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC3-G102 | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3-G102A | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3-G103A | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3-G202A | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3A-S1C3G | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3A-S1CG | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3A-S4C4G | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3A-SC3G | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3A-SCG | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3C-R-1830-90C | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3C-S1C3G | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3C-S4C4G | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3C-SC3G | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
| aircraft | The Boeing Company | DC3D-R-1830-90C | Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft |
Unsafe Condition
Inability to feather the propeller due to inadequate feathering oil supply following loss of engine oil.
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Required Actions
Inspect the quantity of oil retained in the tank by the propeller feathering standpipe in level flight attitude. If less than 1.5 gallons, rework the standpipe to retain at least 1.5 gallons. Aircraft with C-47 type oil tanks (Douglas P/N 5110511) and standpipe (Douglas P/N 1355088) are considered satisfactory.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Not later than the first engine change after December 1, 1950.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas DC3 and C-47 Series Aircraft utilizing a standpipe in the engine oil tank for propeller feathering oil reserve.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Oil Tank Standpipe
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_50-46-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 50-46-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft Subject: Oil Tank Standpipe Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: DC3-G102 | DC3-G102A | DC3-G103A | DC3-G202A | DC3A-S1C3G | DC3A-S1CG | DC3A-S4C4G | DC3A-SC3G | DC3...Show more 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: 50-46-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 50-46-01 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 50-46-01 DOUGLAS: Applies to All Models DC3 and C-47 Series Aircraft Which Utilize a Standpipe in the Engine Oil Tank for Propeller Feathering Oil Reserve. Compliance required not later than the first engine change after December 1, 1950. There have been several cases of inability to feather the propeller due to inadequate feathering oil supply, following loss of engine oil. To correct this condition ascertain the quantity of oil retained in the tank by the propeller feathering standpipe with the airplane in the level flight attitude. If the quantity so retained is less than 1 1/2 gallons, rework the standpipe so that at least this quantity is retained. Aircraft employing C-47 type oil tanks, Douglas P/N 5110511 with Douglas P/N 1355088 standpipe will be considered satisfactory. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_50-46-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 50-46-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft Subject: Oil Tank Standpipe Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: DC3-G102 | DC3-G102A | DC3-G103A | DC3-G202A | DC3A-S1C3G | DC3A-S1CG | DC3A-S4C4G | DC3A-SC3G | DC3...Show more 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: 50-46-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 50-46-01 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All Models DC3 and C-47 Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 50-46-01 DOUGLAS: Applies to All Models DC3 and C-47 Series Aircraft Which Utilize a Standpipe in the Engine Oil Tank for Propeller Feathering Oil Reserve. Compliance required not later than the first engine change after December 1, 1950. There have been several cases of inability to feather the propeller due to inadequate feathering oil supply, following loss of engine oil. To correct this condition ascertain the quantity of oil retained in the tank by the propeller feathering standpipe with the airplane in the level flight attitude. If the quantity so retained is less than 1 1/2 gallons, rework the standpipe so that at least this quantity is retained. Aircraft employing C-47 type oil tanks, Douglas P/N 5110511 with Douglas P/N 1355088 standpipe will be considered satisfactory. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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