AD 92-27-13
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 |
Unsafe Condition
Fire within the engine strut due to damage or chafing of electrical power feeder cables and engine fuel supply tube with less than 0.375 inch clearance.
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Required Actions
Inspect electrical power feeder cables and engine fuel supply tube in engine struts two and three for damage or chafing and minimum clearance. Repair damage and relocate cables to ensure clearance exceeds 0.375 inch. Repeat inspections at intervals based on clearance (500 flight hours if less than 0.75 inch, 1,000 flight hours if 0.75 inch or greater). Modify cable installation per Phase II of Boeing Service Bulletin to achieve 0.75 inch clearance between bridge bracket and bleed duct, terminating prior inspections.
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Compliance Time
Within 10 days after February 18, 1992 (for line numbers 696-734) and within 30 days after March 13, 1992 (for line numbers 735-843, 845-850, 852-870, 872-875, 877, 880-884, 887). Modify within 12 months after March 1, 1993. Prior to further flight if damage or insufficient clearance found.
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Affected Aircraft
Boeing Model 747-400 Series airplanes with line numbers 696 to 843, 845 to 850, 852 to 870, 872 to 875, 877, 880 to 884, and 887.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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