AD 73-09-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Model 707, 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Model 707, 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Model 707, 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Model 707, 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707, 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707, 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707, 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707, 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Model 707, 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Model 707, 727 and 737 Series Airplanes |
Unsafe Condition
Failures or cracks in the forward entry door upper spigot could result in door displacement or separation.
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Required Actions
Inspect the spigot tab using a feeler gauge within 500 landings after the effective date. Perform X-ray inspections every 3000 landings after initial inspection. Replace or modify the spigot if failures or cracks are found.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
Boeing Model 707, 727, and 737 series airplanes listed in Boeing Service Bulletins 3105, 727-52-83, and 737-52-1044 (or later FAA-approved revisions).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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