AD 93-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747-100, -200, and -300 Series Airplanes |
Unsafe Condition
Delayed inflation of evacuation slide/rafts, which could delay or impede the evacuation of passengers during an emergency.
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Required Actions
Modify BFGoodrich evacuation slide/rafts with regulator part numbers 4A3194-1, -2, or -3 installed on doors 1, 2, 4, and 5 in accordance with BFGoodrich Service Bulletin 4A3221-25-250 dated March 12, 1993. Alternative methods of compliance or adjustments may be approved by the FAA's Los Angeles ACO.
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Compliance Time
Within 36 months after the effective date of this AD (November 26, 1993).
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Affected Aircraft
Boeing Model 747-100, -200, and -300 series airplanes equipped with BFGoodrich evacuation slide/rafts listed in Service Bulletin 4A3221-25-250, with regulator part numbers 4A3194-1, -2, or -3.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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