AD 53-25-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS DC-6 Series Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS DC-6 Series Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS DC-6 Series Aircraft |
Unsafe Condition
Cracks have been found in the aileron-cross upper pivot end P/N 4359401, which could lead to failure of the part.
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Required Actions
Inspect the aileron-cross upper pivot end using an 8-power magnifying glass, dye penetrant, or equivalent for cracks at the shoulder corner radius. Replace cracked parts with new pivot end assembly P/N 4492248 and bellcrank arm assembly P/N 4492247 following Douglas Service Letter No. 153 Supplement No. 2. Install preloaded centering spring mechanism P/M 3405566 as applicable. Revise the Airplane Operating Manual with specified operational instructions.
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Compliance Time
As soon as practicable but not later than the next 50 hours of operation for DC-6A, DC-6B, and modified DC-6 aircraft. For all affected aircraft, subsequent inspections are required at each airplane overhaul period or after each 2,000 hours of operation, whichever comes first, and after exposure to high ground gust conditions.
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Affected Aircraft
Douglas DC-6, DC-6A, DC-6B aircraft with fuselage numbers 1 through 434, including those with DC-6B type dual flying tab installations.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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