S-M56-MM-03398-00-B
Engine Oil Circuit Air Flow Check Figure 116 (Sheet 8)
F58732
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 ALL  ú ú C01 Page 131 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ENGINE COWLING - DESCRIPTION AND OPERATION
__________________________________________
 1.  General
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 A.  The engine cowling provides an aerodynamically smooth surface over the engine and a protective enclosure for engine-mounted components and accessories. The cowling for each engine includes the inlet cowl, right and left fan cowl panels, forward fairing and fan duct cowl and thrust reverser halves. The fan cowl panels and fan duct cowl and thrust reverser halves are both hinged and removable to provide access to engine components. In addition, necessary access doors and openings are located in the cowling to facilitate maintenance and service operations.
 2.  Inlet Cowl (Fig. 1)
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 A.  The inlet cowl is installed on the forward flange of the engine fan case and provides a passage for proper entry of the inlet airstream for optimum engine operation with minimum aerodynamic drag.
 B.  The inlet cowl is constructed of aluminum honeycomb sandwich acoustic panels with a perforated aluminum sheet inner skin and a prepreg glass fabric outer skin. The lip assembly is constructed of aluminum.
 C.  For anti-icing purposes, engine bleed air is routed to a distribution spray ring located inside the lip of the inlet cowl. During anti-ice operation, the bleed air exits through an exhaust port located at the 6 o'clock position on the inlet cowl lip.
 D.  A T12 temperature sensor is installed on the inlet cowl at approximately the 3 o'clock position and a T2 temperature sensor at approximately the 10 o'clock position . Refer to AMM 73-21-00/001, Fuel Control, for description and operation of T12 and T2 temperature sensors.
 E.  Two hoist fitting receptacles are installed in the leading edge of the inlet cowl at approximately the 3 and 9 o'clock positions. Another receptacle is provided at approximately the 2 o'clock position on the inlet cowl attachment flange. The receptacles provide the attach points normally used for inlet cowl hoisting during removal and installation.
 3.  Fan Cowl (Fig. 2)
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 A.  The left and right fan cowl panels fair with the inlet cowl, forward fairing, and fan duct cowl and thrust reverser halves. The fan cowl panels are of honeycomb core construction with an aluminum foil applied to the inside to attenuate electromagnetic interference. Opening or removing the panels provides access to the forward electrical and fluid disconnects, engine accessories and components mounted on the fan case, inlet cowl and accessory gearbox, and forward areas of the thrust reverser.
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 ALL  ú ú C01 Page 1 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
T2 TEMPERATURE SENSOR
INLET COWL
A
Inlet Cowl Location
Figure 1

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 ALL  ú ú C01 Page 2 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE B FORWARD LATCH
FAN COWL HINGE FAN COWL PANEL (4 PLACES)
FAN COWL PANEL
ENGINE OIL TANK ACCESS
AND PRESSURE RELIEF DOOR

STARTER AIR
　
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