AD 70-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Series Airplanes |
Unsafe Condition
Malfunctions resulting in unusable passenger evacuation slides and reduced reliability of the passenger evacuation system.
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Required Actions
Inspect and/or modify the passenger evacuation system per specified service bulletins within specified time frames. Adjust torque of nut P/N 69B11101-1 to 125-150 inch-pounds. Inspect and modify cabin doors per Boeing Service Bulletin 25-2092.
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Compliance Time
Within the next 300 hours' time in service after May 18, 1971, for initial inspections/modifications; subsequent actions have varying compliance times up to 5000 hours' time in service.
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Affected Aircraft
Boeing Model 747 Series Airplanes including 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, and other 747 variants listed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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