AD 93-10-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
Unsafe Condition
Cracks in the portal latch pin support fittings on the lower lobe forward and aft cargo doors and main deck side cargo door could cause inadvertent in-flight opening of the doors.
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Required Actions
Perform detailed visual inspections for cracks in portal latch pin support fittings, replace cracked parts, check door rigging, inspect bolts and nuts, and perform operational tests as per Boeing Service Bulletins 747-52-2186 and 747-52A2233. Repeat inspections at specified intervals and replace components if necessary.
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Compliance Time
Within the next 1,800 flight hours or 600 flight cycles after the effective date (May 14, 1993), whichever occurs first for cargo configurations; within 12,500 flight hours, 2,500 flight cycles, or 30 months for passenger configurations. Repeat inspections at intervals not to exceed the same units as the initial compliance.
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Affected Aircraft
Boeing Model 747 series airplanes listed in Boeing Service Bulletins 747-52-2186, Revision 4, and 747-52A2233, including 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C series, and others as specified.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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