AD 99-21-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | Airworthiness Directives; BOEING Model 727-100 and -100C Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | Airworthiness Directives; BOEING Model 727-100 and -100C Series Airplanes |
Unsafe Condition
Corrosion of the skin panels of the lower fuselage on airplanes with hot-bonded doublers could result in loss of airplane pressurization.
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Required Actions
Replace the skin panels of the lower fuselage between body station BS 950 and BS 1183 with non-bonded skin panels in accordance with Boeing Service Bulletin 727-53-0085, Revision 4. Compliance may be achieved using earlier revisions of the service bulletin (Revisions 2 or 3) or alternative methods approved by the FAA.
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Compliance Time
Within 4 years after the effective date of this AD or within 20 years since original installation, whichever occurs later.
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Affected Aircraft
Boeing Model 727-100 and -100C series airplanes with line numbers 126, 130, 146, 153, 221, 287, 331, 339, 345, 355, 416, 516, 532, 540, 551, 555, 559, 575, 592, 594, 596, 599, 600, 604, 605, 615, 619, 625, 626, 628, 630, 631, 632, 635, 640, 641, 643, 645, 647, 658, 660, 686, 695, 700, 711, 712, 735, 748, 766, 768, 784, 797, 803, 806, 810, 812, 817, 821, 822, 824, 829, 854, 856, 857, 858, 861, and 869.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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