AD 50-18-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives;DOUGLAS All Model DC-6 Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives;DOUGLAS All Model DC-6 Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives;DOUGLAS All Model DC-6 Aircraft |
Unsafe Condition
Worn 4 1/2 order engine crankshaft torsional damper (P/N 101169) may cause propeller blade tip failure in Hamilton Standard 43D60/6841A-O, 6851A-O, and 6873A-O propeller blades when operating R-2800-83AM4, R-2800-83A, or CA type engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Placard aircraft to avoid operation between specified rpm ranges (1,800-1,975; 2,025-2,175; 2,225-2,450) except for acceleration/deceleration. Allow 2,450 rpm for climb under specific gross weight conditions and permit takeoff/emergencies above 2,450 rpm for over 80,000 pounds.
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Compliance Time
To have been accomplished by April 28, 1950.
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Affected Aircraft
Douglas All Model DC-6 Aircraft equipped with Hamilton Standard 43D60/6841A-O, 6851A-O, and 6873A-O propeller blades and R-2800-83AM4, R-2800-83A, or CA type engines.
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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