AD 2006-06-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-300, 747-400, 747-400D, and 747SR Series Airplanes |
Unsafe Condition
Reports of cracks in the skin and bearstrap at the upper aft corner and at the lower forward corner of the fuselage cutout at main entry doors (MEDs) number 3, which could propagate and result in rapid decompression of the airplane.
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Required Actions
Conduct a one-time inspection to determine whether any steel doubler (small or large) is installed at the lower forward and upper aft corners of the fuselage cutout at MEDs number 3. Depending on the results, perform repetitive inspections for cracks of the skin, bearstrap, and small steel doubler (if installed) at the applicable corner or corners of the fuselage cutouts, and take related investigative/corrective actions if necessary. Optionally, install a large steel doubler at the affected corners to terminate repetitive inspections.
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Compliance Time
Within 12 months of the effective date (April 26, 2006).
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Affected Aircraft
All Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-300, 747-400, 747-400D, and 747SR series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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