AD 81-11-06 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING 707/720 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING 707/720 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING 707/720 Series Airplanes |
Unsafe Condition
Cracks in stringers 5 and 7 and adjacent lower wing skin between wing stations 265 and 470.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct low frequency eddy current inspections for 720/720B series airplanes within 500 landings after effective date and every 2,860 landings thereafter. For 707 series airplanes, inspect using specified methods based on model-specific thresholds and intervals per Boeing Service Bulletin A3395 revisions. Repairs must be made prior to further flight as approved.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within specified intervals: 500 landings after effective date, then intervals not exceeding 2,860 landings for 720/720B; model-specific thresholds and intervals per table for 707 series.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All Boeing 707/720 series airplanes certificated in all categories.
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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