AD 99-20-10
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 pressure web of the nose landing gear wheel well could result in loss of airplane pressurization.
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Required Actions
Install reinforcement straps and stiffeners on the sidewall, top, and forward bulkhead panels of the pressure web of the nose landing gear wheel well in accordance with Boeing Service Bulletin 727-53-0145, Revision 1. Compliance must be completed prior to 60,000 total flight cycles or within 4 years after the effective date of this AD, whichever occurs later.
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Compliance Time
Prior to 60,000 total flight cycles or within 4 years after November 8, 1999, whichever occurs later.
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Affected Aircraft
Boeing Model 727 series airplanes with line numbers 124, 126, 130, 146, 221, 287, 331, 339, 345, 355, 416, 439, 516, 532, 540, 608, 631, 650, 717, 777, 788, 791, 837, and 1087.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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