AD 61-18-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING 707 Series and Boeing 720 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING 707 Series and Boeing 720 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING 707 Series and Boeing 720 Series Aircraft |
| aircraft | The Boeing Company | 707-200 | BOEING 707 Series and Boeing 720 Series Aircraft |
| aircraft | The Boeing Company | 707-300 Series | BOEING 707 Series and Boeing 720 Series Aircraft |
| aircraft | The Boeing Company | 707-300B Series | BOEING 707 Series and Boeing 720 Series Aircraft |
| aircraft | The Boeing Company | 707-300C Series | BOEING 707 Series and Boeing 720 Series Aircraft |
| aircraft | The Boeing Company | 707-400 Series | BOEING 707 Series and Boeing 720 Series Aircraft |
| aircraft | The Boeing Company | 720 Series | BOEING 707 Series and Boeing 720 Series Aircraft |
| aircraft | The Boeing Company | 720B Series | BOEING 707 Series and Boeing 720 Series Aircraft |
Unsafe Condition
Failure in the main landing gear trunnion support due to cracks in the web, chord areas, flanges, and fittings of the trunnion support rib and bearings.
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Required Actions
Inspect and clean specified areas of the main landing gear trunnion support for cracks at intervals of 200, 35, 350, 420, 840, and 5,000 hours' time in service. Stop drill cracks under allowable lengths per Boeing Service Bulletin 859 (R-2 or later) and replace or repair components with FAA-approved procedures if cracks exceed limits. Conduct detailed inspections and rework per Service Bulletin 874 within 3,500 hours' time in service.
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Compliance Time
Compliance required within the specified intervals (e.g., 200 hours' time in service for initial inspections, 3,500 hours' time in service for rework).
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Affected Aircraft
Boeing 707 Series Aircraft Serial Nos. 17586-17652, 17658-17690, 17692-17712, 17718-17724, 17903-17906, 17918-17919, 17925-17930, 18012 and 18054 and Boeing 720 Series Aircraft Serial Nos. 17907-17917, 18013-18020, 18023, and 18041.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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