AD 2007-23-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes; Model 757-200 Series Airplanes; and Model 767-200, 767-300, and 767-300F Series Airplanes |
Unsafe Condition
Failure of a time delay relay on a Boeing Model 777 ELMS panel led to testing of similar relays used in the cargo fire suppression system. The time delay relay controls when the secondary fire bottles discharge.
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Required Actions
Inspect the part number (P/N) TDH6103-1204, -1804, and -6003 time delay relay to determine its date code. Replace the relay if necessary.
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Compliance Time
Within 24 months after the effective date of this AD.
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Affected Aircraft
Boeing Model 747-400, 747-400D, 747-400F, 757-200, 767-200, 767-300, and 767-300F series airplanes, as identified in the specified service bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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