AD 46-39-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54A-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54B-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54D-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54E-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54G-DC | DOUGLAS Model C-54 Series Aircraft |
Unsafe Condition
Valve freezing due to ice forming in the detent chamber of fuel tank selector and crossfeed valves.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Rework Parker and Hydro Aire valves by filling the detent chamber with Dow Corning compound No. 4 and installing a washer to retain the compound and act as a water shield.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than November 15, 1946
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Affected Aircraft
Douglas Model C-54 Series Aircraft including models C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC
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
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