AD 74-15-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707-300, -300B/C, and -400 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707-300, -300B/C, and -400 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707-300, -300B/C, and -400 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707-300, -300B/C, and -400 Series Airplanes |
Unsafe Condition
Cracking in the upper wing skin under the external rib chord at WBL 59.24 around the 4 critical fasteners.
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Required Actions
Inspect wing skins for cracks using eddy current or ultrasonic procedures per Boeing Service Bulletin 3168. Repetitive inspections required at intervals not exceeding 200 flights until eddy current inspection or modification per SB 2607. Further inspections at intervals not exceeding 2,000 flights after modification per SB 2626 or 5,000 flights initially for unmodified airplanes.
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Compliance Time
Within the next 100, 200, or 300 flights depending on flight count (over 10,000; 7,500-10,000; or 5,000-7,500 flights respectively).
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Affected Aircraft
Boeing 707-300, -300B/C, -400 series airplanes listed in Boeing Service Bulletin 3168 with more than 5,000 flights and not accomplished SB 2607 or 2427 part X(a).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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