AD 44-20-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | S-307 | BOEING 307 Series Aircraft |
| aircraft | The Boeing Company | SA-307B | BOEING 307 Series Aircraft |
| aircraft | The Boeing Company | SA-307B-1 | BOEING 307 Series Aircraft |
Unsafe Condition
Cracks in square aluminum alloy 24SRT tubing in wing spars, front and rear spar fuselage bulkheads, and fin and stabilizer attachment bulkheads may progress rapidly once initiated, leading to structural failure.
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Required Actions
Inspect all square aluminum alloy 24SRT tubing in specified locations visually at intervals per model: SA-307B requires inspections every 150 hours or 90 days, detailed inspections annually or at engine overhaul, and annual x-ray inspections. SA-307B-1 and S-307 require inspections every 850 hours/120 days and 700 hours/120 days respectively. Report defects to FAA and repair as directed.
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Compliance Time
before further flight
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Affected Aircraft
Boeing S-307, SA-307B, SA-307B-1 aircraft
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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