AD 48-09-02
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
Short circuits in the electrical distribution bus from nacelles one to four, which cannot be protected by circuit protective devices.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the bus for 1/2-inch clearance from protuberances in nacelle areas, replace substandard brackets and clamps with approved Douglas standard quality and Adel or equivalent cushioned nongrounding type, inspect and replace No. 1/0 nacelle-to-bus feeder cables if chafing or mechanical deterioration is evident.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Inspection required by April 1, 1948, and thereafter at intervals not to exceed 400 hours (or at each routine check period for scheduled air carrier operators); inspection required not later than July 1, 1948, and thereafter at intervals not to exceed 8,000 hours; and determine compliance by June 1, 1948.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas C-54 and DC-4 Aircraft, including models C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, and DC-4.
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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