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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-40-00-002
APU IGNITION AND START SYSTEM - SPU AND SCU GENERAL DESCRIPTION
APU IGNITION AND START SYSTEM - SPU AND SCU GENERAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The starter-generator supplies the initial rotation of the APU for
the start cycle.
The starter-generator is also a source of electrical power for the
airplane systems. It supplies 90 kva of ac electrical power on
ground and in flight.
See the electrical chapter for more information about the
generate function of the starter-generator. (CHAPTER 24)
Location
The starter-generator is on the upper right side of the APU
gearbox. Eight bolts hold the starter-generator to the gearbox.
General Description
The APU starter-generator has a terminal block and a electrical
connector.
The starter-generator has three rotors mounted on the same
shaft. For each rotor there is a stater winding installed in the
starter-generator case. These are the rotor-stator pairs:
* Permanent magnet generator (PMG)
* Exciter
* Main generator.
The starter-generator also has 6 rotating diodes attached to the
shaft.
A resolver mounted on the starter-generator shaft sends rotor
position to the SCU. The SCU uses the rotor position signal to
synchronize the ac power to the rotor position.
The APU oil system cools the starter-generator.
The weight of the starter-generator is 54.5 pounds (24.7kg).
Training Information Point
A ground support lift fitting on the top of the APU compartment
and the starter-generator helps remove and replace the startergenerator.
APU IGNITION AND START SYSTEM - APU STARTER-GENERATOR
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APU IGNITION AND START SYSTEM - APU STARTER-GENERATOR
APU IGNITION AND START SYSTEM - APU STARTER-GENERATOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The ignition system starts the combustion of the fuel-air mixture
during engine start. The APU electronic control unit controls the
ignition system.
The ignition system components are on the bottom of the
engine.
Ignition Unit
The ignition unit changes 28v dc power to a high voltage pulsed
current that goes to the igniter plug. The ignition unit has one
channel for one igniter plug lead and igniter plug. The ignition
unit supplies one spark per second to the igniter plug.
Igniter Plug Lead
The igniter plug lead connects the ignition unit to the igniter
plug. The igniter plug lead insulation prevents radio
interference.
Igniter Plug
There is one igniter plug. It supplies the high energy spark for
fuel-air ignition.
Functional Description
The ECU energizes the ignition system at 0 percent speed
during APU start. The ECU deenergizes the ignition system at
60 percent speed.
The ECU energizes the ignition system if the APU engine speed
goes below 95 percent speed during APU operation (speed
droop).
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APU IGNITION AND START SYSTEM - IGNITION SYSTEM - GENERAL DESCRIPTION
APU IGNITION AND START SYSTEM - IGNITION SYSTEM - GENERAL DESCRIPTION
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APU IGNITION AND START SYSTEM - IGNITION SYSTEM - GENERAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
To start the APU, put the APU switch to the START position and
release the switch to the ON position. This signals the ECU to
begin the start cycle.
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