AD 85-23-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | Airworthiness Directives; McDONNELL DOUGLAS DC-4 and C54-DC Series, and all C54 Military |
| aircraft | The Boeing Company | C54A-DC | Airworthiness Directives; McDONNELL DOUGLAS DC-4 and C54-DC Series, and all C54 Military |
| aircraft | The Boeing Company | C54B-DC | Airworthiness Directives; McDONNELL DOUGLAS DC-4 and C54-DC Series, and all C54 Military |
| aircraft | The Boeing Company | C54D-DC | Airworthiness Directives; McDONNELL DOUGLAS DC-4 and C54-DC Series, and all C54 Military |
| aircraft | The Boeing Company | C54E-DC | Airworthiness Directives; McDONNELL DOUGLAS DC-4 and C54-DC Series, and all C54 Military |
| aircraft | The Boeing Company | C54G-DC | Airworthiness Directives; McDONNELL DOUGLAS DC-4 and C54-DC Series, and all C54 Military |
| aircraft | The Boeing Company | DC-4 | Airworthiness Directives; McDONNELL DOUGLAS DC-4 and C54-DC Series, and all C54 Military |
Unsafe Condition
Loss of the elevator trim tab control in flight due to cracks in the left-hand and right-hand elevator trim tab spars at station 81.5.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a dye penetrant inspection for cracks in the elevator trim tab spars at station 81.5. If no cracks are found, rework and reinstall the steel control horn (P/N 2357165). If cracks are found, rework the control horn and repair the spar using McDonnell Douglas Service Rework Drawing J060262 Rev B or equivalent. Compliance must also include adherence to AD 48-06-05 and AD 51-09-02 for fasteners and torque requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 100 flight hours time in service after the effective date of this AD, unless previously accomplished
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Affected Aircraft
McDonnell Douglas Model DC-4 and C54-DC series, and all C54 military models eligible or to be made eligible for civil use
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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