AD 98-23-51
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
Corrosion and subsequent fatigue cracking of the fuselage skin lap joints covered by external doublers at stringers S-4L, S-10L, S-19L, and S-26L from body station 360 to 740 could result in rapid decompression of the airplane.
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Required Actions
Within 60 landings after the effective date, perform a detailed internal visual inspection for cracking, corrosion, or delamination. Repeat inspections at intervals not exceeding 60 landings until modification is done. Modify the lap joints by removing external doublers and reworking the joint per Boeing Service Bulletin 727-53-0072, Revision 5, ensuring fasteners penetrate all layers. Compliance with modification must be at the latest of: prior to 28,000 total landings, within 250 landings after effective date, or within 120 days after effective date.
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Compliance Time
The modification required by paragraph (b) must be accomplished at the latest of the following: prior to the accumulation of 28,000 total landings, within 250 landings after the effective date of this AD, or within 120 days after the effective date of this AD.
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Affected Aircraft
Boeing Model 727 series airplanes, line positions 1 through 849 inclusive, converted from passenger to cargo or combi configurations, 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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