Airworthiness Directive · Amendment 39-14017 · 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
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
This AD applies to Boeing Model 747-200B, 747-200C, 747-200F, 747-300, and 747SR series airplanes; certificated in any category; equipped with General Electric CF6-45 or -50 series engines.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747-200B, 747-200C, 747-200F, 747-300, and 747SR series airplanes, equipped with GE CF6-45 or -50 series engines. This AD requires modifying the side cowl assemblies on the engines by replacing existing wear plates with new extended wear plates and installing new stop fittings. This AD is prompted by reports of a gap at the interface of the lower portion of the side cowl and the aft flange of the thrust reverser. We are issuing this AD to prevent an excessive quantity of air from entering the fire zone that surrounds the engine, which, in the event of an engine fire, could result in an inability to control or extinguish the fire.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 24 months after the effective date of this AD: Modify the side cowl assemblies on the engines by replacing existing wear plates with new extended wear plates and installing new stop fittings, by doing all actions according to the Accomplishment Instructions of Boeing Service Bulletin 747-71-2300, Revision 1, dated October 30, 2003. Any applicable corrective actions must be done before further flight.
If bulb seals were installed on the trailing edge of the fan thrust reverser in accordance with Boeing Service Letter 747-SL-71-045: Concurrently with or before further flight after accomplishing paragraph (f) of this AD, remove the bulb seals, plug the open holes in the trailing edge of the fan thrust reverser, and adjust the cowl latches as applicable, in accordance with Boeing Service Letter 747-SL-71-045-C, dated April 10, 2003.
