AD 2005-06-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-200B | Airworthiness Directives; Boeing Model 747-200B, 747-200C, 747-200F, 747-300, and 747SR Series Airplanes Equipped With General Electric (GE) CF6-45 or -50 Series Engines |
Unsafe Condition
Reports of a gap at the interface of the lower portion of the side cowl and the aft flange of the thrust reverser, which could allow an excessive quantity of air to enter the fire zone surrounding the engine, potentially leading to an inability to control or extinguish an engine fire.
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Required Actions
Modify the side cowl assemblies on the engines by replacing existing wear plates with new extended wear plates and installing new stop fittings, according to Boeing Service Bulletin 747-71-2300, Revision 1. If bulb seals were installed on the trailing edge of the fan thrust reverser, remove the bulb seals, plug the open holes, and adjust the cowl latches as applicable, in accordance with Boeing Service Letter 747-SL-71-045-C.
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Compliance Time
Within 24 months after the effective date of the AD, with any applicable corrective actions done before further flight.
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Affected Aircraft
Boeing Model 747-200B, 747-200C, 747-200F, 747-300, and 747SR series airplanes equipped with General Electric CF6-45 or -50 series engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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