AD 52-18-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All Models DC-6, DC-6A and DC-6B Series Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All Models DC-6, DC-6A and DC-6B Series Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All Models DC-6, DC-6A and DC-6B Series Aircraft |
Unsafe Condition
Cracks in the forward flange of the lower front spar cap at Station 120 1/2 at left and right hand adjacent to the bolt attachment of the lower inboard nacelle inboard attach angle.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the forward flange of the lower front spar cap using dye check or equivalent method with bolt removal at intervals not exceeding 250 hours for airplanes over 4,000 flight hours. Visually inspect at intervals not exceeding 35 flight hours for airplanes over 4,000 flight hours. Reinforce spar cap and other areas per Douglas Drawings 5482863 and 5482950 by specified deadlines, prioritizing high-time airplanes and those with repaired flanges.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Reinforcement should be accomplished by September 1, 1953, on airplanes having over 4,000 hours flying time by that date. Airplanes with less than 4,000 hours as of September 1, 1953, should be reinforced prior to accumulation of 4,000 hours flying time. Temporary repairs must be replaced at the next engine change not to exceed 1,500 hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas DC-6, DC-6A, and DC-6B series aircraft.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.