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 FAN COWL - DESCRIPTION AND OPERATION

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 1. General
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 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 001) The fan cowl door assemblies are interchangeable units. They enclose the engine fan case between the air intake cowl and thrust reverser. Inboard fan cowl door of each nacelle incorporates strakes. Each assembly is supported by three hinges at the pylon and latched along the bottom centerline with three adjustable tension hook latches.
R **ON A/C 151-199, 301-399, 401-499,
 (Ref. Fig. 001) The fan cowl door assemblies are interchangeable units. They enclose the engine fan case between the air intake cowl and thrust reverser. Each fan cowl door assembly incorporates strakes. Each assembly is supported by three hinges at the pylon and latched along the bottom centerline with three adjustable tension hook latches.
 **ON A/C ALL
 2. Description
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 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 002, 003, 004) The fan cowls are bonded graphite epoxy skins and aluminum honeycomb sandwich construction. A land is effected with the air intake cowl at the forward end, and with the fan thrust reverser at the aft end. Both lands incorporate an edge protector. The forward land incorporates two fan cowl locator fittings (associated with air intake cowl alignment fitting). A composite outer skin of the fan cowl incorporates a lightning protection system consisting of an expanded copper screen (ECS) material. This material enables the fan cowl to satisfy Zone 1A lightning strike requirements. A bulb-type seal is provided along the lower longitudinal splitline and a sheet metal rub strip is provided along the upper longitudinal splitline which interfaces with a pylon mounted sheet metal seal. Strakes are installed on the inboard fan cowl door of each engine.
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 Fan Cowl Doors
 Figure 001

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 E E Feb 01/98 E E ECES E F 『 E C F M E E E E 56-5B E F 『 E C F M E E E E 56-5B E F 『 E C F M E E E E 56-5B E An electrical bonding strip, which is connected to the strake backplate and the fan cowl locator blade provides an electrical bond between the strake and the engine.

R  Fan Cowl Cross Section Figure 002
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R  Fan Cowl Alignment and Edge Protection Feature Figure 003
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R  Fan Cowl Door Seals Figure 004
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R **ON A/C 151-199, 301-399, 401-499,
 (Ref. Fig. 002, 003, 004) The fan cowls are bonded graphite epoxy skins and aluminum honeycomb sandwich construction. A land is effected with the air intake cowl at the forward end, and with the fan thrust reverser at the aft end. Both lands incorporate an edge protector. The forward land incorporates two fan cowl locator fittings (associated with air intake cowl alignment fitting). A composite outer skin of the fan cowl incorporates a lightning protection system consisting of an expanded copper screen (ECS) material. This material enables the fan cowl to satisfy Zone 1A lightning strike requirements. A bulb-type seal is provided along the lower longitudinal splitline and a sheet metal rub strip is provided along the upper longitudinal splitline which interfaces with a pylon mounted sheet metal seal. Strakes are installed on the right and the left side of the fan cowl doors of each engine. An electrical bonding strip, which is connected to the strake backplate and the fan cowl locator blade provides an electrical bond between the strake and the engine.
 **ON A/C ALL
 3. Opening/Closing
_______________ (Ref. Fig. 005, 006) There are two telescopic hold open rods on each door. The hold open rods lock to brackets on the engine fan case. They support the fan cowl doors in the open position. A 40-degree position serves for routine maintenance and a 55-degree position serves for increased access. Three hook type latches are provided on the left hand door, and mating adjustable eye bolts on the right hand door. The bottom seal pressure between the doors is adjustable by varying the shim pack thickness behind the latch striker pads. The latch handle closing pressure is adjustable with the fan cowl doors closed.
　
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