AD 60-23-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING 707-100 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING 707-100 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING 707-100 Series Aircraft |
Unsafe Condition
The engine start lever slipping toward the 'OFF' position causing engine flame-out, incorrect parts, improper installations, and combustion chamber explosions due to igniter plug firing during initial engine rotation in some airplanes.
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Required Actions
Modify and inspect the start lever system by machining an additional slot in the start lever guides, verify correct installation of control stand spacers and lever guide fillers, ensure detents have a minimum 0.53 inch spacing, and rig the system properly. Modify the starting ignition system by removing specific jumper wires and installing new wiring as per Boeing Service Bulletins.
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Compliance Time
within 2,500 hours' time in service after effective date
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Affected Aircraft
Boeing 707-100 Series aircraft with serial numbers 17586 through 17591, 17628 through 17651, 17658 through 17672, 17696 through 17702, and 17925 through 17927.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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