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EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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APU BLEED AIR SYSTEM - FUNCTIONAL DESCRIPTION
APU BLEED AIR SYSTEM - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The APU controls provide control for the APU for all operating
conditions.
Flight Compartment Controls and Panels
These are the APU controls and panels in the flight
compartment:
* APU switch (P5)
* APU bleed air switch (P5)
* APU generator switch (P5)
* APU fire warning switch (P8).
Other Control Components
The P28 APU remote control panel is on the right wheel well aft
bulkhead.
The electronic control unit (ECU) controls the APU operation
when the ECU receives a signal from the controls in the flight
compartment. The ECU is in the aft cargo compartment right
side.
The ECU also uses signals from certain APU and airplane
systems for correct operation of the APU.
APU CONTROLS - INTRODUCTION
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Purpose
The ECU controls APU functions. The ECU also contains circuits
for fault detection and isolation.
Location
The ECU is on a shelf in the aft cargo compartment near the aft
cargo door.
Training Information Point
The ECU is a line replaceable unit (LRU). The circuit cards in the
ECU are not LRUs.
GUN 201-999
To get access to the ECU, you must open the aft cargo door and
the hinge door that protects the ECU front face.
GUN 001-099, 101-115
To get access to the ECU, you must open the aft cargo door and
remove the panel that protects the ECU front face.
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Training Information Point
If you remove the ECU for maintenance, do not remove the data
memory module from the APU at the same time. Lose of APU
memory data will result.
APU CONTROLS - ELECTRONIC CONTROL UNIT - INTRODUCTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The ECU gets inputs from airplane systems and from the APU.
The ECU receives 28v dc power from the 28v dc switched hot
battery bus.
Airplane System ARINC 429 Data Bus
The ECU receives airplane data from the display electronic unit
(DEU). The ARINC 429 bus transmits this information. You use
the CDU to get APU BITE data from the ECU.
Operational Software Loading
Maintenance personnel can install operation software in the
ECU with the data loader. See the data loader section for more
information on the data loader. (SECTION 34-61)
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