AD 97-09-13
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
Corrosion and fatigue cracking of the upper deck floor beam at station 980 could cause the beam to break, resulting in extensive damage to adjacent structure and possible rapid decompression of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a one-time detailed visual inspection to detect corrosion and/or fatigue cracking of the upper deck floor beam at station 980, either with the cart lift threshold removed or, for older airplanes, an initial inspection with the threshold installed followed by a later inspection with it removed. Repair any detected corrosion or cracking and reinstall the cart lift threshold in accordance with the alert service bulletin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 6 years after the effective date of the AD or within 6 years after the accomplishment of the actions specified in Boeing Service Bulletin 747-53-2327
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747-300 and -400 series airplanes with line numbers up to and including 843, and Model 747 series airplanes modified to a stretched upper deck configuration with an upper deck cart lift installed at station 980.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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