AD 48-17-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft |
| aircraft | The Boeing Company | C54A-DC | Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft |
| aircraft | The Boeing Company | C54B-DC | Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft |
| aircraft | The Boeing Company | C54D-DC | Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft |
| aircraft | The Boeing Company | C54E-DC | Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft |
| aircraft | The Boeing Company | C54G-DC | Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft |
| aircraft | The Boeing Company | DC-4 | Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft |
Unsafe Condition
Malfunctioning of vacuum pumps or other vacuum pump system components can cause fire within the lines, leading to burn through of hose connections into the engine compartment.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a hose liner between the exhaust port vacuum pump fittings and the separator line or install a stainless steel flexible hose between the pump and the separator.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Not later than the date established in accordance with the provisions of special Civil Air Regulation Serial Number SR-329, or any subsequent regulation affecting this compliance date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas All DC-4 and C-54 Aircraft equipped with Pesco Vacuum Pumps and Separators.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Vacuum Pumps
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_48-17-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-17-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft Subject: Vacuum Pumps Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | C54A-DC | C54B-DC | C54D-DC | C54E-DC | C54G-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: 48-17-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-17-04 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-17-04 DOUGLAS: Applies to All DC-4 and C-54 Aircraft Equipped With Pesco Vacuum Pumps and Separators. To be accomplished not later than the date established in accordance with the provisions of special Civil Air Regulation Serial Number SR-329, or any subsequent regulation affecting this compliance date. In case of malfunctioning of vacuum pumps or other vacuum pump system components, fire can occur within the lines and burn through the hose connections into the engine compartment. To prevent such occurrences a hose liner must be installed between the exhaust port vacuum pump fittings and the separator line or a stainless steel flexible hose must be installed between the pump and the separator. (Douglas Service Bulletin DC-4 No. 85 as revised March 10, 1948, covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_48-17-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-17-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft Subject: Vacuum Pumps Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | C54A-DC | C54B-DC | C54D-DC | C54E-DC | C54G-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: 48-17-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-17-04 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All DC-4 and C-54 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-17-04 DOUGLAS: Applies to All DC-4 and C-54 Aircraft Equipped With Pesco Vacuum Pumps and Separators. To be accomplished not later than the date established in accordance with the provisions of special Civil Air Regulation Serial Number SR-329, or any subsequent regulation affecting this compliance date. In case of malfunctioning of vacuum pumps or other vacuum pump system components, fire can occur within the lines and burn through the hose connections into the engine compartment. To prevent such occurrences a hose liner must be installed between the exhaust port vacuum pump fittings and the separator line or a stainless steel flexible hose must be installed between the pump and the separator. (Douglas Service Bulletin DC-4 No. 85 as revised March 10, 1948, covers this same 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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