AD 86-09-07 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Series Airplanes |
Unsafe Condition
Corrosion in the lower longitudinal lap joint areas could lead to depressurization of the airplane.
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Required Actions
Perform an external visual inspection of lower longitudinal lap joint areas for corrosion in accordance with Boeing Alert Service Bulletin 747-53A2267. If corrosion is found with cracks, skin penetration, missing fasteners, or exceeds 20 inches over 40 inches, repair before further flight. Apply organic corrosion inhibiting compound per Boeing Service Bulletin 747-53A2267, Revision 1. Internal inspections of body frames for cracking must be done before further flight if corrosion is found. Repetitive inspections and repairs per FAA-approved methods are required until terminating action via lap joint repair is completed.
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Compliance Time
Within the next 100 landings after March 30, 1987, or within 4,000 flight hours or 15 months from the last inspection, whichever is later. Reinspections must occur at intervals not exceeding 1,000 flight hours or 6 months (if corrosion found) or 4,000 flight hours or 15 months (if no corrosion found), whichever is sooner. Internal inspections must be repeated at intervals not exceeding 1,000 landings until terminating action is performed.
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Affected Aircraft
Boeing Model 747 series airplanes listed in Boeing Alert Service Bulletin 747-53A2267, dated March 28, 1986, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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