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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 49
Auxiliary Power System
CH-SC-SU Subject Page Effectivity
49-60-00 APU CONTROLS - ELECTRONIC CONTROL UNIT - PROTECTION
SYSTEM
15 GUN ALL
49-60-00 APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING
INFORMATION POINTS - MAIN MENU
20 GUN ALL
49-60-00 APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING
INFORMATION POINTS - CURRENT STATUS
23 GUN ALL
49-60-00 APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING
INFORMATION POINTS - FAULT HISTORY
27 GUN ALL
49-60-00 APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING
INFORMATION POINTS - MAINTENANCE HISTORY
31 GUN ALL
49-60-00 APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING
INFORMATION POINTS - IDENT CONFIG
34 GUN ALL
49-60-00 APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING
INFORMATION POINTS - INPUT MONITORING
37 GUN ALL
49-60-00 APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING
INFORMATION POINTS - OIL QUANTITY
40 GUN ALL
49-60-00 APU CONTROLS - SPEED SENSOR 42 GUN ALL
49-60-00 APU CONTROLS - INLET TEMPERATURE SENSOR T2 44 GUN ALL
49-70-00 APU INDICATING SYSTEM - EGT INDICATION 2 GUN ALL
49-70-00 APU INDICATING SYSTEM - DATA MEMORY MODULE (DMM) 4 GUN ALL
49-80-00 APU EXHAUST SYSTEM - EXHAUST DUCT 2 GUN ALL
49-80-00 APU EXHAUST SYSTEM - AFT FAIRING 4 GUN ALL
49-CONTENTS
Page 4
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 49
Auxiliary Power System
CH-SC-SU Subject Page Effectivity
49-90-00 APU LUBRICATION SYSTEM - INTRODUCTION 2 GUN ALL
49-90-00 APU LUBRICATION SYSTEM - LUBE MODULE 4 GUN ALL
49-90-00 APU LUBRICATION SYSTEM - LUBE MODULE - FUNCTIONAL
DESCRIPTION
7 GUN ALL
49-90-00 APU LUBRICATION SYSTEM - OIL COOLER AND TEMPERATURE
CONTROL VALVE
10 GUN ALL
49-90-00 APU LUBRICATION SYSTEM - MAGNETIC DRAIN PLUG 12 GUN ALL
49-90-00 APU LUBRICATION SYSTEM - FUNCTIONAL DESCRIPTION 14 GUN ALL
49-90-00 APU LUBRICATION SYSTEM - OIL INDICATING - GENERAL
DESCRIPTION
17 GUN ALL
49-90-00 APU LUBRICATION SYSTEM - OIL INDICATING - COMPONENTS 20 GUN ALL
49-CONTENTS
Page 5
D633A101-GUN Jun 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 49
Auxiliary Power System
THIS PAGE IS INTENTIONALLY LEFT BLANK
49-00-00
Page 1
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The AlliedSignal 131-9(B) auxiliary power unit (APU) supplies
electrical and pneumatic power to other airplane systems. This
permits these airplane systems to operate without the use of
ground power sources or the engines. The APU can also supply
electrical and pneumatic power in the air.
Altitude Operational Limits
The APU generator can supply 90 KVA electrical power up to
32,000 feet (9,754 meters) and 66 KVA to 41,000 feet (12,500
meters). Electrical and pneumatic power is available at the
same time up to 10,000 feet (3,048 meters). Pneumatic power
alone is available up to 17,000 feet (5,183 meters). The APU can
be started at 41,000 feet or below.
Abbreviations and Acronyms
* APB - auxiliary power breaker
* APU - auxiliary power unit
* ACS - air conditioning system
* BAT - battery
* BAV - bleed air valve
* BPCU - bus power control unit
* CDU - control display unit
* DP - differential pressure
* DMM - data memory module
* DEU - display electronic unit
* DFDAU - digital flight data acquisition unit
* DU - display unit
* ECU - electronic control unit
* EGT - exhaust gas temperature
* FCU - fuel control unit
* FMV - fuel metering valve
* AGCU - APU generator control unit
* HOT - high oil temperature
* IGV - inlet guide vane
* KVA - kilovolt-ampere
* LOP - low oil pressure
* LVDT - linear variable differential transformer
* LRU - line replaceable unit
* MES - main engine start
* OLS - oil level sensor
* P2 - inlet pressure
* PPH - pounds per hour
* PPM - pounds per minute
* PSI - pounds per square inch
* PSIA - pounds per square inch absolute
* PSID - pounds per square inch differential
* PSIG - pounds per square inch gage
* PT - total pressure
* PWR - power
* RPM - revolutions per minute
* RTL - ready to load
* RVDT - rotary variable differential transformer
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