AD 89-03-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
| aircraft | The Boeing Company | 757-200CB Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
| aircraft | The Boeing Company | 757-200PF Series | Airworthiness Directives; BOEING Model 757, 767, 737-200, -300, -400, 747-200 and -300 Series Airplanes |
Unsafe Condition
Incorrectly installed fire protection system plumbing and/or wiring could lead to failure of fire detection, warning, or extinguishing systems, compromising fire protection capability.
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Required Actions
Conduct functional checks of fire protection systems including engine overheat, fire detection, extinguishing systems, cargo smoke detection, and fire extinguishing plumbing and wiring as per specified Boeing Telexes. Submit findings reports within 10 days. Correct discrepancies before further flight. Alternate compliance may be approved.
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Compliance Time
Within 25 days after May 26, 1989, unless previously accomplished; and immediately after any maintenance that could cause mis-wiring/mis-plumbing.
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Affected Aircraft
Boeing Models 737-200, -300, -400, 747-200, -300 series, 757, and 767 series airplanes manufactured after December 31, 1980.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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