AD 66-01-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 720 Series | BOEING Models 720 and 720B Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Models 720 and 720B Series Airplanes |
Unsafe Condition
Cracking in the wing upper surface skin
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the wing upper surface skin for cracks in accordance with Boeing Service Bulletin No. 2309, Revision 2, or later FAA-approved revision. If cracks are detected, perform an x-ray inspection of the area from stringer No. 8 to the rear spar on both wings. Accomplish x-ray inspections of all concealed areas on each wing at specified intervals. Repair cracks as per the service bulletin and follow inspection intervals based on crack visibility and length.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated in the AD, with specific intervals based on time in service: airplanes with less than 10,000 hours must comply before 10,300 hours, and those with 10,000+ hours within 300 hours after effective date. Subsequent inspections at intervals not exceeding 600 hours. For (g) requirements, airplanes with <7,000 hours must comply before 8,800 hours, and those with 7,000+ within 1,800 hours post-effective date, with subsequent intervals not exceeding 2,000 hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Models 720 and 720B Series Airplanes
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
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