AD 93-11-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | Airworthiness Directives; BOEING Model 707 and 720 Series Airplanes |
Unsafe Condition
Separation of an inboard engine from an airplane due to cracks in the midspar fittings.
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Required Actions
Perform a close visual inspection of the midspar fittings to detect cracks in accordance with Boeing Service Bulletin 3183, Revision 4. Repeat inspections at specified intervals. Replace midspar fittings with improved ones within compliance times.
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Compliance Time
At the later of prior to 12,000 flight hours or within specified flight hours/cycles after October 8, 1992, as applicable. Replacement must occur within 4 years or 4,800 flight cycles after AD effective date.
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Affected Aircraft
Boeing Model 707 and 720 series airplanes, line numbers 1 through 906, including those modified with STCs SA2699NM, SA3595NM, or SA4015NM.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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