AD 47-33-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | DOUGLAS Model DC-4 and C-54 Type Aircraft |
| aircraft | The Boeing Company | C54A-DC | DOUGLAS Model DC-4 and C-54 Type Aircraft |
| aircraft | The Boeing Company | C54B-DC | DOUGLAS Model DC-4 and C-54 Type Aircraft |
| aircraft | The Boeing Company | C54D-DC | DOUGLAS Model DC-4 and C-54 Type Aircraft |
| aircraft | The Boeing Company | C54E-DC | DOUGLAS Model DC-4 and C-54 Type Aircraft |
| aircraft | The Boeing Company | C54G-DC | DOUGLAS Model DC-4 and C-54 Type Aircraft |
| aircraft | The Boeing Company | DC-4 | DOUGLAS Model DC-4 and C-54 Type Aircraft |
Unsafe Condition
Wear of the outboard elevator hinge parts could lead to failure of the horizontal stabilizer outer hinge assembly.
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Required Actions
Inspect immediately for wear, proper installation, and operation. Repeat inspections at intervals not exceeding 250 flight hours or at each major inspection closest to 250 hours for Scheduled Air Carrier Operations until mandatory rework is done. Rework includes line reaming holes, pressing in specified bushings, machining bushing shoulders, reaming holes through bushings, replacing the outboard elevator hinge eyebolt assembly with P/N 2328991, and reinstalling elevators with specific bolts, washers, nuts, and cotter pins.
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Compliance Time
Inspections must be accomplished immediately and thereafter at intervals not exceeding 250 flight hours or at each major inspection closest to 250 hours for Scheduled Air Carrier Operations. The mandatory rework must be completed not later than October 15, 1947.
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Affected Aircraft
The Boeing Company DC-4 and C-54 Type Aircraft except production DC-4 serial numbers 42952, 42992, and subsequent.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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