48-17-04: Vacuum Pumps
FAA order 48-17-04 is an airworthiness directive. The FAA's subject line: Vacuum Pumps. It names Douglas C-54: about 7 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: heating, ice protection and utility systems.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- The Boeing Company
- Models
- C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, DC-4
- On this site
- Douglas C-54 7 registered
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (819 characters)
48-17-04 DOUGLAS: Applies to All DC-4 and C-54 Aircraft Equipped With Pesco Vacuum Pumps and Separators. \n\n\tTo 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. \n\n\tIn 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. \n\n\t(Douglas Service Bulletin DC-4 No. 85 as revised March 10, 1948, covers this same subject.)
Related safety bulletins advice on the same designs, not orders
2014-11-24NM-15-03 · Flight Controls
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/48-17-04.json · aircraft systems.