AD 48-01-01
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
Cracking and failure in the locking groove of Goodyear Model 20DHBM wheels due to the use of the old one-piece flange (P/N 511033 or 530405-M) and lock ring (P/N 511051-1).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove wheel-retaining flanges from applicable wheels, inspect lock ring grooves for cracking, measure groove diameter, rework wheels exceeding 0.500-inch diameter but less than 0.563-inch, and replace one-piece flanges and lock rings with two-piece flange P/N 530735-M and studs P/N 511284-6 by August 1, 1948.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Not later than the next scheduled inspection at which necessary facilities are available, and at each succeeding No. 3 inspection until II is accomplished; and II must be accomplished not later than August 1, 1948.
AI-generated summary from the source AD text. Verify against the official source before acting.
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) using Goodyear Model 20DHBM wheels with one-piece flanges P/N 511033 or 530405-M and lock ring P/N 511051-1.
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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