AD 47-16-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | DOUGLAS Model C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54A-DC | DOUGLAS Model C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54B-DC | DOUGLAS Model C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54D-DC | DOUGLAS Model C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54E-DC | DOUGLAS Model C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | C54G-DC | DOUGLAS Model C-54 and DC-4 Aircraft |
| aircraft | The Boeing Company | DC-4 | DOUGLAS Model C-54 and DC-4 Aircraft |
Unsafe Condition
Failure of the ammeter shunts, voltmeter circuit, or generator field circuit protection could result in electrical circuit overloads, leading to potential fire hazards or loss of electrical system functionality.
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Required Actions
Install two 10-ampere non-automatic-reset circuit breakers in each nacelle junction box for ammeter leads. Install a 10-ampere non-automatic-reset circuit breaker in the main junction box for the voltmeter circuit wire PJ-34. Install 15-ampere circuit breaker switches at the regulator location for wires PA-530, PA-531, PA-730, and PA-731, using non-thermal types as standard fuses do not provide sufficient protection.
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Compliance Time
not later than September 1, 1947
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Affected Aircraft
Douglas Model C-54 and DC-4 aircraft with ammeter shunts in the positive generator leads, including models C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, and DC-4
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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