AD 96-01-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; Boeing Model 747-100 and -200 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; Boeing Model 747-100 and -200 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; Boeing Model 747-100 and -200 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; Boeing Model 747-100 and -200 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; Boeing Model 747-100 and -200 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; Boeing Model 747-100 and -200 Series Airplanes |
Unsafe Condition
Malfunction of the safety interlock system of the main deck side cargo door could result in the door opening in flight, causing rapid decompression. The system failure allows the pressurization vent door to close even if all latches are not fully latched and locked.
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Required Actions
Repetitive inspections of the latch safety pins to ensure secure latching; deactivate the 'LATCHES UNLOCKED' and 'DOOR UNLOCKED' lights; install a placard indicating light deactivation. Actions must be accomplished per FAA-approved methods.
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Compliance Time
Effective January 29, 1996, except for those to whom it was made effective January 3, 1996, via telegraphic AD T96-01-51.
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Affected Aircraft
Boeing Model 747-100 series with serial numbers 19637, 19638, 19642, 19647, 19648, 19657, 19725, 20320, 20347 modified with STC SA2322SO; and Model 747-200 series serial number 20010 modified with STC SA4227NM-D.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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