AD 91-06-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
Unsafe Condition
Cracks in the fuselage skin at lap joints S-4, S-10, S-14, S-19, S-20, and S-26 where the upper skin is less than 0.056 inch thick from body station 259 to 1183 could lead to rapid decompression of the airplane.
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Required Actions
Perform high frequency eddy current (HFEC) inspections for cracks at specified fuselage lap joints within specified landing intervals and timeframes. Conduct detailed external visual inspections for cracks, corrosion, and delamination at intervals not exceeding 15 or 30 months. Repair detected cracks, corrosion, or delamination prior to further flight. Replace fasteners with protruding head fasteners within 4 or 6 years after August 21, 1989, depending on landing count. Inspect blind fasteners at intervals not exceeding 2,500 landings.
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Compliance Time
Within the next 2,500 landings or 1 year after August 21, 1989, whichever occurs first, or prior to the accumulation of 28,000 landings, whichever occurs later; thereafter at intervals not to exceed 4,500 landings or 3 years, whichever occurs sooner. For visual inspections: within 6 months after August 21, 1989, unless accomplished within the last 9 months, and thereafter at intervals not to exceed 15 or 30 months. Fastener modifications must be completed within 4 or 6 years after August 21, 1989, depending on landing count.
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Affected Aircraft
Boeing Model 727 series airplanes listed in Boeing Service Bulletin 727-53-0072, Revision 5, dated June 1, 1989, 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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