AD 66-13-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Models 707 and 720 Series Airplanes |
Unsafe Condition
Failure of the emergency exit light circuit or dome light switch to function properly during power loss on the essential a.c. bus could result in inadequate illumination during takeoff and landing.
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Required Actions
Within 125 hours' time in service after May 13, 1966, incorporate an operating limitation in the Airplane Flight Manual or adjacent placard requiring the dome light switch to be in the blue, low, or bright position during takeoff and landing. Within 1,200 hours' time in service after May 13, 1966, install a new relay in the emergency exit light circuit or rewire the circuit using existing contacts on the essential a.c. power failure relay to ensure automatic function upon essential a.c. bus power loss, as per Boeing Service Bulletin 1789, Rev. 1 or FAA-approved equivalent. The operating limitation may be removed after completing the modification in (b).
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Compliance Time
Within the next 125 hours' time in service after May 13, 1966 (for part (a)) and within the next 1,200 hours' time in service after May 13, 1966 (for part (b))
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Affected Aircraft
Boeing Models 707 and 720 Series airplanes listed in Boeing Service Bulletin 1789, Revision 1.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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