AD 55-18-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | DOUGLAS All Model DC-6 Series Aircraft |
| aircraft | The Boeing Company | DC-6A | DOUGLAS All Model DC-6 Series Aircraft |
| aircraft | The Boeing Company | DC-6B | DOUGLAS All Model DC-6 Series Aircraft |
Unsafe Condition
Inadvertent propeller reversing due to malfunctioning solenoid operated throttle locks and improper throttle operation at touchdown on landing.
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Required Actions
Install a protective device requiring a separate and distinct motion to engage reverse pitch range, ensuring safeguards against unlocking when throttles are forward of idle setting. Alternate designs must be FAA-approved if they meet the objectives in paragraph 2.
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Compliance Time
As soon as practicable but not later than January 1, 1957.
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Affected Aircraft
Douglas DC-6, DC-6A, DC-6B aircraft not equipped with the new Douglas Type Propeller Reverse Thrust Mechanical Throttle Lockgate.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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