AD 57-16-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-7 | Airworthiness Directives; DOUGLAS All DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7B | Airworthiness Directives; DOUGLAS All DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7C | Airworthiness Directives; DOUGLAS All DC-7 Series Aircraft |
Unsafe Condition
Failure in the threaded area of the forward end of the rudder tab push-pull tube (P/N 3483231) due to reaming exceeding Douglas Service Bulletin limits, leading to loss of rudder control.
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Required Actions
Inspect rudder tab push-pull tube assemblies (P/N 3593396, 3593396-501, 3483231) for reaming exceeding limits and signs of failure within 300-hour operation. Replace cracked assemblies or those reamed beyond limits. Visually reinspect non-cracked assemblies every 300 hours until replaced with P/N 3593396.
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Compliance Time
within the next 300-hour operation
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Affected Aircraft
Douglas DC-7, DC-7B, DC-7C aircraft prior to Fuselage No. 697
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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