AD 99-10-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; Boeing Model 747-200, -300, and -400 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; Boeing Model 747-200, -300, and -400 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; Boeing Model 747-200, -300, and -400 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; Boeing Model 747-200, -300, and -400 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; Boeing Model 747-200, -300, and -400 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; Boeing Model 747-200, -300, and -400 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; Boeing Model 747-200, -300, and -400 Series Airplanes |
Unsafe Condition
Cracked fuse pins in the upper link, midspar fittings, and diagonal brace of the nacelle strut due to fatigue and corrosion could result in failure of the fuse pin and strut-to-wing attachment, and consequent loss of the strut and separation of the engine from the airplane.
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Required Actions
Replace the fuse pins in the upper link, midspar fittings, and diagonal brace of the nacelle strut with new corrosion-resistant pins within 10 months after the effective date. Compliance must follow Boeing Service Bulletin 747-54-2155, Revision 2, and pins must be replaced in sets as specified.
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Compliance Time
Within 10 months after the effective date
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Affected Aircraft
Boeing Model 747-200, -300, and -400 series airplanes equipped with General Electric CF6-80C2 series engines, as listed in Boeing Service Bulletin 747-54-2155, Revision 2, excluding those modified per AD 95-13-05 or AD 95-13-06.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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