AD 99-18-05
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
Fatigue cracks in the vertical beam web and forward flange of the aft pressure bulkhead could result in inability to withstand fail-safe loads and consequent loss of cabin pressurization.
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Required Actions
Conduct repetitive inspections to detect cracks in the forward flange of the vertical beam at specified buttock lines. Install a splice repair if cracks are found. Install a preventative modification on the vertical beam of the door frame when applicable.
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Compliance Time
Initial inspection due before 20,000 total flight cycles or within 1,500 flight cycles after the effective date (October 5, 1999), whichever is later. Subsequent inspections based on flight cycles since splice repair installation or modification status.
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Affected Aircraft
All Boeing Model 727 series airplanes including 727-100, 727-100C, 727-200, and 727-200F series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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