- Models
- C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, DC-4
- Data sheet
- TCDSA-762
- Registered aircraft
- 4 matched by model
- Product
- Aircraft · Large airplane
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 19 KB | 431bd64f…1c5718e | FAA DRS (API key needed) |
On this page
The airworthiness directive
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.)
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 4
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.