AD 91-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
| aircraft | The Boeing Company | 757-200CB Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
| aircraft | The Boeing Company | 757-200PF Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
| aircraft | The Boeing Company | 757-300 Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
| aircraft | The Boeing Company | 767-200 Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
| aircraft | The Boeing Company | 767-300 Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
| aircraft | The Boeing Company | 767-300F Series | Airworthiness Directives; BOEING Model 757, 747-400, and 767 Series Airplanes |
Unsafe Condition
Reduced or blocked discharge of fire extinguishing agent from the cargo compartment metered system and false indications of low pressure in the initial discharge system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine the part number and serial number of each cargo compartment fire extinguishing agent container. Replace containers listed in Pacific Scientific HTL/Kin-Tech Division Alert Service Bulletin 26A1100, Revision 1, with ones not listed in that bulletin. No further action if part and serial numbers are not listed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 30 calendar days after the effective date of this AD, unless previously accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 757, 747-400, and 767 series airplanes as listed in Boeing Service Bulletins 757-26A0026, 747-26A2180, 767-26A0075, 767-26-0076 (dated March 28, 1991), and 757-26-0027, Revision 1 (dated April 11, 1991)
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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