AD 91-06-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200CB Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200PF Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-300 Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
Unsafe Condition
Cracks and fractures in the left and right Number 4 passenger door upper and lower hinge arm leaf springs could prevent door opening during emergency use.
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Required Actions
Inspect leaf springs for cracks/fractures within specified flight cycles. Replace cracked/fractured springs with new steel or titanium springs as per service bulletin. Repeat inspections at intervals based on flight cycle thresholds. Replace all steel springs with titanium within 18 months of AD effective date.
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Compliance Time
Prior to the accumulation of 2,000 flight cycles, or within the next 100 flight cycles after the effective date of this AD, whichever occurs later for initial inspection. Terminating action required within 18 months after AD effective date.
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Affected Aircraft
Boeing Model 757-200 Series, 757-200CB Series, 757-200PF Series, 757-300 Series airplanes listed in Boeing Alert Service Bulletin 757-52A0049 dated July 5, 1990.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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