AD 75-03-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707-300, -300B, - 300C, and -400 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707-300, -300B, - 300C, and -400 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707-300, -300B, - 300C, and -400 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707-300, -300B, - 300C, and -400 Series Airplanes |
Unsafe Condition
Cracks in the upper wing skin splice plate at W.S. 360, particularly in the high stressed area near stringer 11, due to fatigue.
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Required Actions
Inspect the upper wing splice plate at station 360 via X-ray, low frequency eddy current, or approved method within the next 50 landings (if not done in last 350 landings), and repeat every 400 landings. Repair cracks prior to further flight using Boeing Service Bulletin 2510 or approved method. Terminate inspections after installing specified doublers or approved modifications.
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Compliance Time
Within the next 50 landings, unless accomplished within the last 350 landings, and at intervals thereafter not to exceed 400 landings.
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Affected Aircraft
Boeing Model 707-300, -300B, -300C, and -400 series airplanes listed in Boeing Service Bulletin No. 3157, Revision 4 or later FAA approved revisions, with specific landing counts: 707-300/-400 at 13,000+ landings, 707-300B/-300C at 8,000+ landings.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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