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.
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.