AD 91-18-04
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
Cracking of fuselage frames at body station BS 2200 and BS 2220 could lead to sudden decompression of the airplane.
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Required Actions
Accomplish a detailed visual inspection of fuselage frames at BS 2200 and BS 2220 per Boeing Service Bulletin 747-53-2302, repeating inspections at intervals not exceeding 2,000 flight cycles. If cracking is found, perform close visual inspections of adjacent structures and repair as required prior to further flight.
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Compliance Time
Prior to the accumulation of 10,000 total airplane flight cycles; or prior to the accumulation of 10,000 flight cycles since frame replacement; or within 1,000 flight cycles after September 20, 1991.
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Affected Aircraft
Boeing Model 747 series airplanes listed in Boeing Service Bulletin 747-53-2302 dated December 13, 1990, 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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