AD 2003-16-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Series Airplanes Equipped with General Electric CF6-45 or CF6-50 Series Engines |
| engine | General Electric | CF6-45 or CF6-50 Series | Airworthiness Directives; Boeing Model 747 Series Airplanes Equipped with General Electric CF6-45 or CF6-50 Series Engines |
Unsafe Condition
Chafing of the fuel line or incorrect clearance between the fuel line and pneumatic duct insulation blanket, leading to leaking fuel line couplings, chafed fuel lines, restricted or clogged strut drain lines, migrating fluids or vapors toward ignition sources, and flashback of external flame into the strut, which could result in an uncontained engine strut fire.
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Required Actions
Inspect for chafing of the fuel line or incorrect clearance between the fuel line and pneumatic duct insulation blanket; perform a fuel leak check and strut drain test; take corrective action if necessary; replace the outboard strut fuel line coupling O-rings and retaining rings with new parts; replace the pneumatic duct boot with a new part; and, for certain airplanes, install a flame arrestor and drain line entry screens.
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Compliance Time
Within 12 months of the effective date
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Affected Aircraft
All Boeing Model 747 series airplanes equipped with General Electric CF6-45 or CF6-50 series engines.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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