AD 66-27-02
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 leading edge of the elevator nose structure in bays No. 4 and No. 5.
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Required Actions
Inspect elevators for cracks in bays No. 4 and No. 5 visually in accordance with Boeing Service Bulletin No. 2386 (R-1) or FAA-approved revision. Repair or replace cracked parts per FAA-approved Structural Repair Manual or Service Bulletin. Modifications per Service Bulletin No. 2386(R-1) discontinue repetitive inspections.
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Compliance Time
Within specified intervals based on model and time in service: 800/1,600 hours for 707-300/-400 with ≥20,000 hours; 200/400 hours for 707-300C with ≥2,000 hours; earlier intervals for lower time airplanes. Compliance required as indicated from effective date (November 9, 1966).
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Affected Aircraft
Boeing Model 707-300, -300B, -300C, and -400 Series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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