AD 91-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
Unsafe Condition
Failure of the Door 3 evacuation system due to potential malfunction of the regulator assembly (P/N 4A3474-1) with BFGoodrich single-piece ramp/slide part numbers 7A1418-1 through -16.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the regulator assembly to P/N 4A3474-2 or -3 configuration by installing improved components per BFGoodrich SB 4A3416-25-233 or Rev 1. Reidentify the Door 3 ramp/slide as per the same service bulletin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 12 months after the effective date of this AD (January 9, 1992)
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Affected Aircraft
Boeing Model 747 series airplanes equipped with BFGoodrich single-piece ramp/slide part numbers 7A1418-1 through -16 for Door 3 evacuation system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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