AD 93-09-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 757-200CB Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 757-200PF Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 757-300 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 767-200 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 767-300 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 767-300F Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
Unsafe Condition
Improper electrical connection of the fire extinguishing system due to a damaged discharge cartridge or electrical connector on the fire extinguisher bottle.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct a detailed visual inspection of discharge cartridges and electrical connectors on fire extinguisher bottles in APU, cargo compartment, and engine fire extinguishing systems within 120 days after the effective date. If damage is found, replace the damaged item and perform an operational test prior to further flight. Follow Boeing Alert Service Bulletins as applicable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 120 days after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747-400 series airplanes (line positions 696-906), 757 series (line numbers 1-488), and 767 series (line numbers 1-421)
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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