AD 60-02-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | Airworthiness Directives; BOEING Model 707 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Long Body | Airworthiness Directives; BOEING Model 707 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Short Body | Airworthiness Directives; BOEING Model 707 Series Aircraft |
| aircraft | The Boeing Company | 707-200 | Airworthiness Directives; BOEING Model 707 Series Aircraft |
| aircraft | The Boeing Company | 707-300 Series | Airworthiness Directives; BOEING Model 707 Series Aircraft |
| aircraft | The Boeing Company | 707-300B Series | Airworthiness Directives; BOEING Model 707 Series Aircraft |
| aircraft | The Boeing Company | 707-300C Series | Airworthiness Directives; BOEING Model 707 Series Aircraft |
| aircraft | The Boeing Company | 707-400 Series | Airworthiness Directives; BOEING Model 707 Series Aircraft |
Unsafe Condition
Failure of the Mach trim warning lights and Mach warning and fire warning bell systems could result in inadequate indication of system malfunctions or failure to alert the flight crew of critical conditions.
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Required Actions
Remove and rework the Mach and fire warning bell support bracket (Boeing P/N 69-1640) to accept redesigned components (Boeing P/N 69-50013). Install two diodes (Boeing assembly 69-43070-6) in the Mach trim system resistor box and revise the indicating light circuitry.
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Compliance Time
by April 30, 1960
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Affected Aircraft
Boeing Model 707 Series aircraft with serial numbers 17586 through 17591, 17609 through 17612, 17628 through 17652, 17658 through 17672, 17691, 17696 through 17702, 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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