AD 77-13-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | BOEING Model 727 Series Airplanes |
Unsafe Condition
Cracking in the Body Station 910 floor beam.
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Required Actions
Inspect the lower flanges of the B.S. 910 floor beam for cracks using low frequency eddy current, eddy current, dye penetrant methods, or approved alternatives. Repairs must be done per Boeing Service Bulletin 727-53-134 or approved methods before further flight, except unpressurized flight under FAR 21.197 is allowed to reach a repair location. Repeat inspections at intervals not exceeding 1000 or 2000 pressurization cycles as specified.
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Compliance Time
Within the next 1000 pressurization cycles for airplanes with more than 20,000 pressurization cycles on the effective date, or prior to 21,000 pressurization cycles for those with less than 20,000. Adjustments may be requested with substantiating data.
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Affected Aircraft
Boeing Model 727 series airplanes listed in Boeing Service Bulletin 727-53-134, certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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