AD 89-21-09
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
Fatigue cracks in the skin at body station (BS) 460 just above left and right number 1 main entry doors could cause cabin pressure loss.
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Required Actions
Conduct high frequency eddy current (HFEC) inspections of fuselage skin along specified fasteners at intervals not exceeding 3,000 landings. If cracks are found, modify the splice per Boeing Service Bulletin or perform internal HFEC inspections and repairs per the 747 Structural Repair Manual. Alternate compliance may be approved by the FAA.
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Compliance Time
Prior to the accumulation of 10,000 landings, or within the next 1,000 landings after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Boeing Model 747 series airplanes listed in Boeing Service Bulletin 747-53-2289, Revision 1, dated January 26, 1989.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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