AD 77-02-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707-300, -400, -300B, -300C Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707-300, -400, -300B, -300C Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707-300, -400, -300B, -300C Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707-300, -400, -300B, -300C Series Airplanes |
Unsafe Condition
Cracks in the wing skin under the beavertail, rear spar upper chord, and adjacent wing skin areas from specific wing stations, as well as cracks in stringers and fastener holes, which could lead to structural failure.
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Required Actions
Inspect wing skin and spar areas via X-ray, visual, ultrasonic, and eddy current methods per Boeing Service Bulletin 3168 and 3280. Repair cracked components prior to further flight. Install external doublers or new wing skin as terminating actions per specified service bulletins.
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Compliance Time
Within the next 250 landings for initial inspections under paragraph A, and within the next 600 landings for paragraph B, with subsequent intervals not exceeding 500 or 1200 landings respectively. Compliance required as indicated unless already accomplished.
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Affected Aircraft
Boeing Model 707-300, -400, -300B, -300C series airplanes certificated in all categories listed in Boeing Service Bulletin No. 3168 with more than 5000 landings.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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