25 03 2016
B737Theory
BOEING 737NG
INTENTIONALLY LEFT WHITE
SYSTEMS MANUAL
Copyright by B737Theory
2
FOR INFORMATION ONLY
B737Theory
BOEING 737NG
Foreword.
This Systems Manual is restricted in use and it is not allowed to copy and distribute the manual
without notification to the B737Theory custodian. This Manual is designed as additional information
on the NG aircraft systems and it must be understood that there can be differences amongst various
NG model aircraft.
About
The B737Theory Facebook page, Manual and Supplement are solely created to interact throughout
the B737NG community and has no direct link to any Company.
THE CONTENT SHALL NOT BE USED FOR ACTUAL OPERATION OF THE AIRCRAFT
B737Theory
The goal of the Facebook page, Manual and Supplement is to expand Boeing 737NG theoretical
knowledge by increasing the amount of visitors aiming for interaction. Recommend the page through
your private Facebook page rather than sharing the posts, too bad I cant remove the share option in
FB as Ive put in a lot of time, research and knowledge in the posts and manuals.
I have re-designed this Manual using alphabetical order on subjects now and also adjusted the text
toward document content iso post content. Besides that Ive improved and personalized images to
my own design as not to conflict with copyrights.
About the author:
I am a retired Naval Instructor Flight Engineer and currently a B737NG Ground School Instructor. I
enjoy expanding knowledge on aircraft systems and publishing this, making it available to users
around the World. I combine courseware development skills with technical aviation knowledge to
explain several systems written in my own way, sometimes a little further than needed but creating a
more complete picture to the basic standard required systems knowledge.
Corrections and/or recommendations are welcome and can be send to bertdaantje@gmail.com, or
send a message on https://www.facebook.com/B737Theory/ and Ill look into it, when confirmed
Ill update the document.
Thank you and enjoy . . .
SYSTEMS MANUAL
Copyright by B737Theory
3
FOR INFORMATION ONLY
B737Theory
BOEING 737NG
Contents
Foreword. ................................................................................................................................................ 3
AC transfer bus loss ................................................................................................................................. 8
Aileron trim ........................................................................................................................................... 10
Air stair .................................................................................................................................................. 12
Antiskid .................................................................................................................................................. 14
APU ........................................................................................................................................................ 15
APU Starter/Generator.......................................................................................................................... 17
Auto Brake Disarm................................................................................................................................. 18
Auto Slat System ................................................................................................................................... 19
Battery busses ....................................................................................................................................... 21
Battery discharge light .......................................................................................................................... 22
Brake accumulator ................................................................................................................................ 23
Brakes .................................................................................................................................................... 24
Cabin altitude indication ....................................................................................................................... 26
Cargo compartment fire protection ...................................................................................................... 28
Cargo compartments air........................................................................................................................ 30
Center tank boost pumps ...................................................................................................................... 31
Climb thrust reduction .......................................................................................................................... 32
Closed crossfeed valve on takeoff and landings? ................................................................................. 33
Cockpit panel + symbols..................................................................................................................... 34
Cockpit voice recorder .......................................................................................................................... 35
Coking .................................................................................................................................................... 37
Common display system malfunctions ................................................................................................. 38
Control column shaker .......................................................................................................................... 40
Crew oxygen system .............................................................................................................................. 42
Display electronic unit ........................................................................................................................... 44
Dissolved air .......................................................................................................................................... 45
Dual bleed light ..................................................................................................................................... 46
EEC idle modes ...................................................................................................................................... 48
EEC operating modes ............................................................................................................................ 50
Electrical bus bar ................................................................................................................................... 52
SYSTEMS MANUAL
Copyright by B737Theory
4
FOR INFORMATION ONLY
B737Theory
BOEING 737NG
Electrical load shedding ......................................................................................................................... 53
Electro motor driven pump overheat ................................................................................................... 55
Engine electronic Control ...................................................................................................................... 56
Engine fire detection ............................................................................................................................. 57
Engine loss effect on pneumatic system ............................................................................................... 58
Equipment cooling ................................................................................................................................ 60
Feel differential pressure ...................................................................................................................... 62
Fire extinguisher squib .......................................................................................................................... 63
Flight Locks ............................................................................................................................................ 64
Flight spoilers ........................................................................................................................................ 65
Fuel limits .............................................................................................................................................. 66
Fuel scavenge jet pump ......................................................................................................................... 68
Fuel temperature indication ................................................................................................................. 69
Fuel valves ............................................................................................................................................. 70
Fueling panel ......................................................................................................................................... 72
Generator .............................................................................................................................................. 74
Horizontal stabilizer trim ....................................................................................................................... 76
Hydraulic fluid transfer .......................................................................................................................... 78
Hydraulic reservoirs............................................................................................................................... 79
Impact fitting ......................................................................................................................................... 80
Integrated drive generator .................................................................................................................... 81
Isolation valve........................................................................................................................................ 83
Landing gear transfer valve ................................................................................................................... 84
Lavatory fire protection......................................................................................................................... 85
LED Landing Lights ................................................................................................................................. 86
LE flaps................................................................................................................................................... 88
Main hydraulic pumps ........................................................................................................................... 90
Manual gear extension .......................................................................................................................... 92
Mechanical pressure relief valves ......................................................................................................... 94
NiCad battery ........................................................................................................................................ 95
Nitrogen generating system .................................................................................................................. 96
Nose wheel steering lockout ................................................................................................................. 97
Oil indication vertical red lines .............................................................................................................. 98
SYSTEMS MANUAL
Copyright by B737Theory
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FOR INFORMATION ONLY
B737Theory
BOEING 737NG
Outflow valve ........................................................................................................................................ 99
Overboard exhaust valve..................................................................................................................... 101
Overhead panel drains ........................................................................................................................ 103
Override devices .................................................................................................................................. 104
Pack operation..................................................................................................................................... 105
Power transfer unit ............................................................................................................................. 107
Pressure control .................................................................................................................................. 108
Proximity switch electronic unit .......................................................................................................... 110
Ram air duct doors .............................................................................................................................. 111
Recirculation fans ................................................................................................................................ 113
Rudder (vertical stabilizer) load reduction .......................................................................................... 114
Runway awareness and advisory system ............................................................................................ 115
Speed brakes rise on RTO? .................................................................................................................. 117
Standby hydraulic system.................................................................................................................... 118
Standby electrical power ..................................................................................................................... 120
Start switch functions .......................................................................................................................... 122
Tabs ..................................................................................................................................................... 124
Tail skid ................................................................................................................................................ 125
Thermal electrical protections ............................................................................................................ 126
Thrust reversers .................................................................................................................................. 128
Transformer rectifier unit .................................................................................................................... 130
Vortex generators ............................................................................................................................... 132
Weather radar ..................................................................................................................................... 134
Wheel thermal fuse plugs ................................................................................................................... 136
White bug ............................................................................................................................................ 138
Window heating .................................................................................................................................. 139
Wing and body overheat ..................................................................................................................... 141
Wing thermal anti Ice .......................................................................................................................... 142
WTAI valve flashing ............................................................................................................................. 143
Yaw damping ....................................................................................................................................... 144
Zone temperature control ................................................................................................................... 146
SYSTEMS MANUAL
Copyright by B737Theory
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FOR INFORMATION ONLY
B737Theory
BOEING 737NG
SCHEMATICS ........................................................................................................................................ 148
Air Condition ..................................................................................................................... 148
Electrical ........................................................................................................................... 149
Engine Oil & Fuel .............................................................................................................. 150
Fuel ................................................................................................................................... 151
Hydraulic ........................................................................................................................... 152
Lift devices ........................................................................................................................ 153
Pneumatics ....................................................................................................................... 154
Rol control......................................................................................................................... 155
Yaw control ....................................................................................................................... 156
Flight Mode Annunciators ................................................................................................. 157
SYSTEMS MANUAL
Copyright by B737Theory
7
FOR INFORMATION ONLY
