AD 53-19-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | Airworthiness Directives; DOUGLAS All DC-4 and C54-DC Series Aircraft |
| aircraft | The Boeing Company | DC-4 | Airworthiness Directives; DOUGLAS All DC-4 and C54-DC Series Aircraft |
Unsafe Condition
The magnesium cooling fan in the Eclipse Type 901 generator poses a fire hazard due to its material composition.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the magnesium fan unit and install Eclipse-Pioneer spacer P/N 866570 in its place as per Eclipse-Pioneer Service Bulletin No. 505.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
By the next engine overhaul, but not later than April 1, 1954.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas DC-4 and C54-DC Series aircraft utilizing Eclipse-Pioneer Type 901 generators.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Generator Cooling Fan
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_53-19-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 53-19-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All DC-4 and C54-DC Series Aircraft Subject: Generator Cooling Fan Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | DC-4 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 53-19-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 53-19-01 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All DC-4 and C54-DC Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 53-19-01 DOUGLAS: Applies to All DC-4 and C54-DC Series Aircraft Utilizing Eclipse-Pioneer Type 901 Generators. To be accomplished by the next engine overhaul, but not later than April 1, 1954. In view of the fire hazard existing in the use of the magnesium cooling fan in the Eclipse Type 901 generator in the DC-4 and C-54 Series aircraft installations, the magnesium fan as a unit must be removed and Eclipse-Pioneer spacer P/N 866570 installed in its place. (Eclipse-Pioneer Service Bulletin No. 505 covers the above subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_53-19-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 53-19-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All DC-4 and C54-DC Series Aircraft Subject: Generator Cooling Fan Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | DC-4 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: 53-19-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 53-19-01 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All DC-4 and C54-DC Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 53-19-01 DOUGLAS: Applies to All DC-4 and C54-DC Series Aircraft Utilizing Eclipse-Pioneer Type 901 Generators. To be accomplished by the next engine overhaul, but not later than April 1, 1954. In view of the fire hazard existing in the use of the magnesium cooling fan in the Eclipse Type 901 generator in the DC-4 and C-54 Series aircraft installations, the magnesium fan as a unit must be removed and Eclipse-Pioneer spacer P/N 866570 installed in its place. (Eclipse-Pioneer Service Bulletin No. 505 covers the above subject.) 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.
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