AD 85-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727-100, -100C, and -200 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 727-100, -100C, and -200 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727-100, -100C, and -200 Series Airplanes |
Unsafe Condition
Cracks in the Body Station 1183 pressure bulkhead web and vertical beams.
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Required Actions
Visually inspect the aft pressure bulkhead web for cracks following Boeing Service Bulletin 727-53A0173. Depending on flight cycles, inspections must be done within specific intervals (400 or 200 flight cycles) and repaired prior to further flight if cracks are found. Additional inspections of vertical beams may be required if cracks exceed 2 inches.
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Compliance Time
Within the next 400 or 200 flight cycles after the effective date (October 15, 1985), depending on existing flight cycles. For airplanes with less than 40,000 flight cycles, inspections must be done prior to accumulating 25,000 flight cycles. The final inspection under paragraph C must occur within 3800 flight cycles after the effective date or upon reaching 25,000 flight cycles, whichever is later.
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Affected Aircraft
Boeing Model 727-100, -100C, and -200 Series airplanes listed in Boeing Service Bulletin 727-53A0173 dated July 12, 1985.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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