AD 86-16-05
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 aft pressure bulkhead lower web and lower chord of Body Station 2360 bulkhead could lead to structural failure.
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Required Actions
Inspect for corrosion in the aft pressure bulkhead lower web and lower chord per Boeing Service Bulletin 747-53-2220, Rev 1. Repeat inspections at intervals not exceeding 3.5 or 7 years depending on modification status. Repair corrosion before further flight as per the same service bulletin.
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Compliance Time
Within 6 months for airplanes with over 40,000 flight hours on the effective date; within 12 months for 20,000 to 40,000 flight hours; within 24 months or upon 20,000 flight hours, whichever is later.
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Affected Aircraft
Boeing Model 747 series airplanes listed in Boeing Service Bulletin 747-53-2220, Rev 1.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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