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APU FUEL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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APU FUEL SYSTEM - FUNCTIONAL DESCRIPTION
APU FUEL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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APU FUEL SYSTEM - FUNCTIONAL DESCRIPTION
APU FUEL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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APU FUEL SYSTEM - FUNCTIONAL DESCRIPTION
49-40-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The APU ignition and start system gives the initial rotation of the
engine and ignition.
General
The APU ignition and start system consists of these
components:
* Ignition unit
* Igniter plug lead
* Igniter plug
* Start power unit (SPU)
* Start converter unit (SCU)
* Starter-generator.
The APU electronic control unit (ECU) controls the APU start
sequence.
See the APU engine controls section for more information on
the ECU. (SECTION 49-60)
Ignition System
The ignition system supplies sparks to start APU combustion
during the APU start. The ECU energizes the ignition unit at 0
percent speed and deenergizes the ignition unit at 60 percent
speed.
Start System
The starter-generator, SPU, and SCU together supply initial
rotation of the APU. The start power sources are 28v dc from the
battery or 115v ac transfer bus number 1.
APU IGNITION AND START SYSTEM - INTRODUCTION
EFFECTIVITY
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APU IGNITION AND START SYSTEM - INTRODUCTION
APU IGNITION AND START SYSTEM - INTRODUCTION
EFFECTIVITY
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Start Power Unit
The start power unit changes 115v ac or 28v dc electrical power
to 270v dc power. Transfer bus 1 or the battery supplies power
to the start power unit (SPU).
The SPU gives fault data to the ECU through the SCU for display
on the CDU.
The (SPU) is in the EE compartment on the E2-2 shelf.
Start Converter Unit
The start converter unit (SCU) changes the 270v dc power to AC
and sends it to the starter-generator.
The SCU gives fault data to the ECU for display on the CDU.
The SCU is in the EE compartment on the E2-2 shelf.
See the electrical chapter for more information about the APU
starter-generator generate function. (CHAPTER 24)
Start Control
The electronic control unit sends a signal to the start converter
unit when the air inlet door is fully open. The start converter unit
tells the start power unit to supply the 270v dc. The start
converter unit changes the 270v dc to ac power for the operation
of the starter-generator. At 70 percent speed, the electronic
control unit removes the start signal from the start converter
unit. With the start signal off, the SCU and the SPU removes
power from the starter-generator.
Training Information Point
The maximum duty cycle for the SPU and SCU is three starts,
one after the other, followed by a 15-minute cool down period. If
you do too many starts one after the other, the SCU and SPU will
get too hot and stop the APU start. More starts are possible after
the SCU and SPU cool.
You get access to the SCU terminal block for the AC power
feeder wires from the back of the SCU. Remove the panel
behind the E2 rack from the forward cargo compartment to get
access to the back of the SCU.
APU IGNITION AND START SYSTEM - SPU AND SCU GENERAL DESCRIPTION
EFFECTIVITY
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