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25 – 03 – 2016

B737Theory BOEING 737NG

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SYSTEMS MANUAL © Copyright by B737Theory FOR INFORMATION ONLY

INTENTIONALLY LEFT WHITE


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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 can’t remove the share option in

FB as I’ve 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 I’ve 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 [email protected], or

send a “message” on https://www.facebook.com/B737Theory/ and I’ll look into it, when confirmed

I’ll update the document.

Thank you and enjoy . . .

mailto:[email protected]

https://www.facebook.com/B737Theory/


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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


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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


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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


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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

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