AD 51-09-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | Airworthiness Directives; DOUGLAS All Models DC-4 and C54-DC Series Aircraft |
| aircraft | The Boeing Company | DC-4 | Airworthiness Directives; DOUGLAS All Models DC-4 and C54-DC Series Aircraft |
Unsafe Condition
Looseness in empennage control surface hinge bolts and rudder and elevator bracket attaching bolts and hinge eyebolts due to insufficient torque or movement, which could result in control surface failure.
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Required Actions
Inspect and torque check empennage control surface hinge bolts every 2,000 hours of flight time. Clean, inspect, and reassemble rudder and elevator bracket bolts and hinge eyebolts at each major overhaul period. Mark torqued bolts with a painted line to detect movement. Operators with FAA-accepted programs may check 15% of fleet or minimum two aircraft, increasing intervals if no defects found.
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Compliance Time
At intervals not to exceed 2,000 hours of flight time and at each major overhaul period.
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Affected Aircraft
Douglas All Models DC-4 and C54-DC Series Aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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