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remove the ECU. Loss of data will result.
If you replace the data memory module, you must replace it with
a blank module (a module with no data in memory). If you
replace it with one that has data, loss of data and incorrect data
can occur.
APU INDICATING SYSTEM - DATA MEMORY MODULE (DMM)
EFFECTIVITY
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APU INDICATING SYSTEM - DATA MEMORY MODULE (DMM)
APU INDICATING SYSTEM - DATA MEMORY MODULE (DMM)
EFFECTIVITY
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Purpose
The APU exhaust system sends the APU exhaust overboard
through the exhaust duct. The exhaust system prevents APU
compartment damage from high exhaust gas temperatures and
decreases exhaust noise levels.
Components
The APU exhaust duct attaches to the APU turbine section with
a V-band clamp.
These are the major components of the exhaust duct:
* Drain fitting
* V-band clamp flange
* Bellows assembly
* Fluid drip ring
* Baffle
* Acoustic liner
* Outer skin
* Insulation blanket
* Aft support leaf spring.
Training Information Point
You remove the exhaust duct from the tail section to do
maintenance on the duct.
APU EXHAUST SYSTEM - EXHAUST DUCT
EFFECTIVITY
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APU EXHAUST SYSTEM - EXHAUST DUCT
APU EXHAUST SYSTEM - EXHAUST DUCT
EFFECTIVITY
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Purpose
The aft fairing supports the aft end of the exhaust duct and
eductor inlet duct.
Location
The aft fairing is at the aft end of the fuselage.
Functional Description
The aft fairing is superplastic formed titanium that aligns with
the airplane tail cone. The aft fairing has two openings. One
opening is for the APU compartment and eductor inlet. The
other opening is for the APU turbine exhaust.
These are the components of the aft fairing:
* Upper aft fairing
* Lower aft fairing.
Training Information Point
For ease of removal and installation, the aft fairing has an upper
and lower section. To remove the muffler, you remove only the
lower aft fairing.
APU EXHAUST SYSTEM - AFT FAIRING
EFFECTIVITY
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APU EXHAUST SYSTEM - AFT FAIRING
APU EXHAUST SYSTEM - AFT FAIRING
EFFECTIVITY
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Purpose
The APU lubrication system lubricates, cleans, and cools these
components:
* APU starter-generator
* APU bearings
* APU gearbox.
Components
Some lubrication system components are on a common lube
module on the front of the APU. These lubrication system
components are not on the lube module:
* Magnetic drain plug
* Low oil pressure switch
* Oil level sensor
* Oil cooler
* Temperature control valve
* Oil-level sight glass and an oil fill port.
A 5.7 quart (5.4 liter) oil sump is inside the gearbox. The APU oil
cooler and oil lines hold approximately 3 quarts (2.9 liters) of oil.
The total oil quantity of oil in an APU at full is 8.7 quarts (8.3
liters). An oil-level sight glass shows the oil level. An oil fill port
is adjacent to the oil-level sight glass.
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