AD 83-11-02
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
Failure of the floor beams and webs.
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Required Actions
Visually inspect or use eddy current inspection techniques on longitudinal floor beams as specified in Boeing Service Bulletin 747-53-2224. Repair or replace cracked webs or chords prior to further flight. Complete modification of floor beam webs and chords per terminating action procedures in specified service bulletins. Apply organic corrosion inhibitor (BMS 3-23) or equal to exposed structures after each inspection, repair, or modification. Determine landing counts using fleet average calculations as allowed. Adjust inspection intervals with FAA approval if justified. Use special flight permits to reach bases for compliance. Alternate compliance methods may be approved by FAA.
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Compliance Time
Inspections are to commence prior to the accumulation of one-half the number of cycles specified in the 'Repeat Inspection Interval Cycles' column in the appropriate table in Section III of the service bulletin after the effective date of this AD for airplanes which have accumulated more than the number of cycles listed in the 'Inspection Threshold Cycles' column of the table, or prior to accumulating the inspection threshold number of cycles, whichever is later. Inspections are to be repeated at intervals not to exceed those specified in the table.
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Affected Aircraft
Boeing Model 747 series airplanes certificated in all categories listed in Service Bulletin 747-53-2224, Revision 3, or later FAA approved revisions.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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