AD 48-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54A-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54B-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54D-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54E-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54G-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | DC-4 | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
Unsafe Condition
Emergency air brake valve front seizing due to infrequent operation.
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Required Actions
At intervals not to exceed 1,000 hours (or up to 1,700 hours at CAA Agent discretion), connect a gage to one brake port on each side, discharge the air brake cylinder, verify initial air pressure indications are not less than 400 p.s.i., allow 5 minutes for temperature-related pressure changes, and ensure pressure holds steadily for at least 5 minutes. Operate the other air brake control to confirm both pull mechanisms function properly.
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Compliance Time
At intervals not to exceed 1,000 hours, except at the discretion of the CAA Agent, the interval may be increased to coincide with a regular overhaul period, but should in no case exceed 1,700 hours.
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Affected Aircraft
Douglas C-54-DC and DC-4 Aircraft, 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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