AD 47-42-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | Airworthiness Directives; DOUGLAS C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54A-DC | Airworthiness Directives; DOUGLAS C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54B-DC | Airworthiness Directives; DOUGLAS C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54D-DC | Airworthiness Directives; DOUGLAS C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54E-DC | Airworthiness Directives; DOUGLAS C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54G-DC | Airworthiness Directives; DOUGLAS C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | DC-4 | Airworthiness Directives; DOUGLAS C-54 and DC-4 Aircraft |
Unsafe Condition
The rework on the fire seal between the accessories section and the nacelle at the upper cowling former creates a hazardous condition by providing an opening from the accessories section into the nacelle through the access hole under the non-ram air intake fairing.
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Required Actions
Inspect all airplanes to ascertain that a fire seal is provided in the area. If the cowling fire seal has been cut away, it must be replaced with the original type seal or a new type seal as per Douglas Service Bulletin DC-4 No. 19.
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Compliance Time
as soon as possible but in any case not later than the first engine change after November 15, 1947
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Affected Aircraft
The Boeing Company C-54 and DC-4 Aircraft models: C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, DC-4
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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