AD 47-02-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | DOUGLAS Model C-54-DC Series Airplanes and all DC-4's |
| aircraft | The Boeing Company | DC-4 | DOUGLAS Model C-54-DC Series Airplanes and all DC-4's |
Unsafe Condition
The hydraulic hand pump shutoff valve may allow unintended fluid leakage, leading to inadequate hydraulic pressure for critical systems such as brakes, cowl flaps, nose wheel steering, windshield wiper, landing gear, wing flaps, and main accumulator.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Rework the hydraulic hand pump shutoff valve by replacing the valve retainer, spring, plunger with a sleeve and new packings. Remove existing part numbers 5241991 and 4242103, restamp with part numbers 2343816-4 and 2343816-6. Modify the placard at the control to specify system functions for forward and rear positions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas Model C-54-DC Series airplanes incorporating brake pressure accumulators and all DC-4's up to serial number 43065.
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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