AD 2012-16-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Cracking of the midspar fittings, which could result in separation of the nacelle strut and engine from the airplane while in flight, and consequent loss of controllability of the airplane.
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Required Actions
Perform a detailed inspection of the midspar fittings of the nacelle strut to confirm the correct part number is installed, and install the correct part number if necessary. Perform repetitive high frequency eddy current (HFEC) inspections of the midspar fittings of the nacelle strut for cracks, and repair if necessary. Perform repetitive general visual inspections of the nacelle struts to verify that the nacelle strut has not drooped below its normal position, apply the droop stripe to the nacelle strut and sailboat fairing if necessary, and perform repair if necessary.
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Compliance Time
Within 120 days after the effective date of this AD
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Affected Aircraft
All The Boeing Company Model 707-100 long body, -200, -100B long body, and -100B short body series airplanes; Model 707-300, -300B, -300C, and -400 series airplanes; and Model 720 and 720B series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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