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* Electronic engine control
* N1 speed sensor
* Oil tank (oil quantity transmitter)
* Inlet cowl thermal anti-ice valve
* Ignition exciters
* Fan frame compressor case vibration (FFCCV) sensor
* Bleed air regulator
* Ground wing thermal anti-ice solenoid valve
* Overheat/fire detector loop A and B.
The electrical harnesses that connect on the left side of the fan
cowl support beam come from these components:
* Start valve
* N2 speed sensor
* Integrated drive generator (IDG)
* Hydraulic system engine-driven pump
* Hydromechanical unit (HMU).
POWER PLANT - ELECTRICAL HARNESSES
EFFECTIVITY
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71-00-00-004
POWER PLANT - ELECTRICAL HARNESSES
POWER PLANT - ELECTRICAL HARNESSES
EFFECTIVITY
GUN ALL 71-00-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
71-00-00-004
General
Engine drains prevent fluid contact with hot engine areas. You
use engine drains to detect component failures. Engine drains
direct these items overboard:
* Oil
* Fuel
* Hydraulic fluid
* Water
* Vapor.
These components drain fluids through the starter air discharge
duct in the right fan cowl:
* Strut
* Main oil/fuel heat exchanger
* Hydromechanical unit (HMU)
GUN ALL PRE SB CFM56-7B 73-44
* Burner staging valve (BSV)
GUN ALL
* High pressure turbine active clearance control (HPTACC)
valve
* Low pressure turbine active clearance control (LPTACC)
valve
* Left and right variable stator vane (VSV) actuators
* Left and right variable bleed valve (VBV) actuators
* Transient bleed valve (TBV).
Fluids drain through a hole in the left fan cowl panel from these
components:
* Fuel pump
* Integrated drive generator (IDG)
* Hydraulic pump.
The oil tank drains fluid through a hole in the right fan cowl
panel.
See the AMM for more information about allowable leakage
limits. (AMM PART II 71-71)
POWER PLANT - ENGINE DRAINS
EFFECTIVITY
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71-00-00-005
POWER PLANT - ENGINE DRAINS
POWER PLANT - ENGINE DRAINS
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 71-00-00
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71-00-00-005
POWER PLANT - ENGINE DRAINS
POWER PLANT - ENGINE DRAINS
EFFECTIVITY
GUN ALL POST SB CFM56-7B 73-44 71-00-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
71-00-00-005
THIS PAGE IS INTENTIONALLY LEFT BLANK
POWER PLANT - ENGINE DRAINS
71-11-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The engine cowling gives an aerodynamically smooth surface
into and over the engine. It also gives a protective area for
engine components and accessories.
These are the parts of the engine cowling:
* Inlet cowl
* Fan cowl
* Thrust reverser.
See the exhaust chapter for more information on the thrust
reverser. (CHAPTER 78)
Inlet Cowl
The inlet cowl sends air into the engine. The inlet cowl attaches
to the engine.
The T12 access/pressure relief door is on the inlet cowl. The
T12 access/pressure relief door permits access to the T12
sensor. It is also a pressure relief door.
Fan Cowls
The fan cowls give an aerodynamically smooth surface over the
fan case. The fan cowls attach to the fan cowl support beam.
The fan cowls open for maintenance.
These items are on the fan cowls:
* IDG access door
* Chip detector/pressure relief door
* Vortex control device
* Oil tank access door.
IDG Access Door
The IDG access door permits access to the IDG for servicing. It
is on the left fan cowl panel.
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