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B737Theory BOEING 737NG

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ELECTRICAL SUPPLEMENT Copyright by B737Theory FOR INFORMATION ONLY

Foreword.

This Electrical Supplement is an addition to the B737Theory Systems Manual and is restricted in use,

it is not allowed to copyand distribute the manual without notification to the B737Theory custodian.This Supplement is designed as an ELECTRICAL POWER SOURCE,and CIRCUIT BREAKER LOCATION

directory and it must be understood that there are 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 part of the Manual as an Electrical Sources Supplement using alphabetical

order on subjects. I expanded the Electrical Panels, Busses and Circuit Breaker location layouts, which

again may differ on various NG models (600900) but is valuable as a gauge on this subject.

About the author:

I am a retired 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 theoretical aviation knowledge to explain

several systems written in my own way, sometimes a little further than needed but creating a more

complete pictureto the basic standard required systems knowledge.

Corrections and/or recommendations are welcome and can be send to [email protected],or

send a message onhttps://www.facebook.com/B737Theory/and Ill look into it, when confirmed

Ill update the document.

Thank you and enjoy . . .
mailto:[email protected]:[email protected]://www.facebook.com/B737Theory/https://www.facebook.com/B737Theory/https://www.facebook.com/B737Theory/https://www.facebook.com/B737Theory/mailto:[email protected]


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Contents

Foreword. ................................................................................................................................................ 3

Electrical schematic ................................................................................................................................. 7

AC ELECTRICAL BUSSES............................................................................................................................ 8

115 VAC Transfer Bus 1 .................................................................................................... 8

115 VAC Transfer Bus 1 - Sect 1 ....................................................................................... 9

115 VAC Transfer Bus 1 - Sect 2 ....................................................................................... 9

28 VAC Transfer Bus 1 .....................................................................................................10

115 VAC Transfer Bus 2 ...................................................................................................10

115 VAC Transfer Bus 2 - Sect 1 ......................................................................................11

115 VAC Transfer Bus 2 - Sect 2 ......................................................................................11

28 VAC Transfer Bus 2 .....................................................................................................12

115 VAC Main Bus 1.........................................................................................................12

115 VAC Main Bus 2.........................................................................................................13

115 VAC Standby Bus ......................................................................................................13

28 VAC Standby Bus ........................................................................................................14

115 VAC Ground Service Bus 1 ........................................................................................14

28 VAC Ground Service Bus 1 ..........................................................................................15

115 VAC Ground Service Bus 2 ........................................................................................15

28 VAC Ground Service Bus 2 ..........................................................................................15

DC ELECTRICAL BUSSES ......................................................................................................................... 16

28 VDC

Hot Battery Bus ................................................................................................1628 VDC Switched Hot Battery Bus .................................................................................16

28 VDC Battery Bus .......................................................................................................17

28 VDC Battery Bus - Sect 1 ..........................................................................................17

28 VDC - Battery Bus - Sect 2 ..........................................................................................17

28 VDC - Battery Bus - Sect 3 ..........................................................................................18

28 VDC Bus 1 ...................................................................................................................19

28 VDC Bus 1 - Sect 1 ......................................................................................................20

28 VDC Bus 1 - Sect 2 ......................................................................................................20


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28 VDC Bus 2 ...................................................................................................................21

28 VDC Bus 2 - Sect 1 ......................................................................................................22

28 VDC Bus 2 - Sect 2 ......................................................................................................22

28 VDC Ground Service Bus ............................................................................................23

28 VDC Standby Bus - Sect 1 ........................................................................................24

28 VDC - Standby Bus - Sect 2 .........................................................................................24

Circuit Breaker (panel) Locations .......................................................................................................... 25

P6 1 ...............................................................................................................................26

P6 2 ...............................................................................................................................26

P6 3 ...............................................................................................................................27

P6 4 ...............................................................................................................................27

P6 5, Standby Power Control Unit ..................................................................................28

P6 11 & P6 12 .............................................................................................................28

P18 1 .............................................................................................................................29

P18 2 .............................................................................................................................30

P18 3 .............................................................................................................................30

Ac/bs................................................................................................................................................. 31

Bc/bs................................................................................................................................................. 33

Cc/bs................................................................................................................................................. 33

Dc/bs................................................................................................................................................. 34

Ec/bs................................................................................................................................................. 35

Fc/bs................................................................................................................................................. 36

Gc/bs................................................................................................................................................. 37

Hc/bs................................................................................................................................................. 37Ic/bs.................................................................................................................................................. 38

Lc/bs................................................................................................................................................. 38

Mc/bs................................................................................................................................................ 40

Nc/bs................................................................................................................................................. 41

Oc/bs................................................................................................................................................. 41

Pc/bs................................................................................................................................................. 41

Rc/bs................................................................................................................................................. 42

Sc/bs................................................................................................................................................. 42


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Tc/bs................................................................................................................................................. 43

Vc/bs................................................................................................................................................. 44

Wc/bs................................................................................................................................................ 44

Yc/bs................................................................................................................................................. 44

Zc/bs................................................................................................................................................. 45


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AC ELECTRICAL BUSSES

The AC electrical transfer system operates with two basic principles accomplished by operation of

the Bus Power Control Unit (BPCU):1. There is no paralleling of the AC sources of power possible.

2. The source of power being connected to a transfer bus automatically disconnects an existing

source. (or else there is AC paralleling)

The electrical busses are arranged with the most important AC busses first, where after the lesser

(but still) important busses. After the AC selection youll find the DC busses starting with the Battery

busses followed by the Main busses, etc.

Under each bus youll find how the respective bus receive Normal power, and when applicable an

Alternate power source.

The powered components are in Alphabetical order except the red bold facedcircuit breakers. They

refer to (sub) busses and can thereby be isolated, pulling that respective circuit breaker.

115 VAC Transfer Bus 1

Normal powerIDG 1

Alternate powerXFR bus 2, APU gen or GPU via BTBs

28 VAC XFR BUS

GALLEY BUS C & D

GROUND SERVICE BUS 1

MAIN BUS 1

XFR BUS 1 SECT 1

XFR BUS 1 SECT 2

APU START CONVERTER

B SYS ELEC HYDR PUMP

BOOST PUMP TANK l FWD

BOOST PUMP TANK 2 AFTEQUIP COOL SUPPLY FAN ALT

MIDU

TEMP CONT 35 DEG L

TEMP CONTL

TEMP CONT MAN

TRU 1

TRU 3 ALT

VACUUM WASTE BLOWER


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Circuit Breaker (panel) Locations

A generic 3 column list of B737NG circuit breaker locations on their respective circuit breaker panels.

The columns are shown in an Alphabetical order of the powered components, than the panels andthe Alpha/Numerical positions.

Also here, the lay-out can be different amongst several NG type

Boeing 737s.

P6-1 NAVIGATION, INSTRUMENTS & COMMUNICATION

P6-2 SYSTEMS

P6-3 FUEL SYSTEM, LIGHTING & LANDING GEAR

P6-5 STANDBY POWER CONTROL UNIT

P6-4 AIR CONDITION & ELECTRICAL

P6-11 & P6-12 WINDOW HEAT

P18-1 NAVIGATION

P18-2 INSTRUMENTS & COMMUNICATION

P18-3 ANTI-ICE & LIGHTING

P91 & P92 POWER DISTRIBUTION PANELS (Located in the E & E Compartment)


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Ac/bs

AC Transfer Bus 1, C phase P6-4 C15

AC Transfer Bus 2, A phase P6-4 C10

AC Transfer Bus 2, B phase P6-4 C11

ACARS CMU AC P6-1 E8

ACARS CMU DC P6-1 E9

ACARS MU AC P6-1 E7

ACMS P6-1 E4

ADF 1 P18-1 A4

ADF 2 P6-1 A17

ADIRU, Left, AC P18-1 E7

ADIRU, Left, DC P18-1 E5

ADIRU, Left, EXC P18-2 E8

ADIRU, Right DC P6-1 C17

ADIRU, Right, AC P6-1 C14ADIRU, Right, EXC P6-1 C15

AFCS, Sys A, Engage Interlock P18-1 D3

AFCS, Sys A, FCC (DC) P18-1 D2

AFCS, Sys A, Mach Trim (AC) P18-1 C4

AFCS, Sys A, Mach Trim (DC) P18-1 D4

AFCS, Sys A, Sensor Exc (AC) P18-1 C5

AFCS, Sys A, Warn Light (Bat) P18-1 D1

AFCS, Sys B, Engage Interlock P6-2 B4

AFCS, Sys B, FCC (DC) P6-2 B3

AFCS, Sys B, Mach Trim (AC) P6-2 C1

AFCS, Sys B, Mach Trim (DC) P6-2 B2

AFCS, Sys B, Sensor Exc (AC) P6-2 C2

AFCS, Sys B, Warn Light (Bat) P6-2 B1

Air Cond Bleed Air, Press Ind P6-4 B5

Air Cond Bleed Air, Valve Isln P6-4 A5

Air Cond Bleed Air, Valves Left P6-4 A7

Air Cond Bleed Air, Valves Right P6-4 B7

Air Cond Bleed Air, XDCR Left P6-4 A6

Air Cond Bleed Air, XDCR Right P6-4 B6

Air Cond Mix Valve Pos Ind (6-7) P6-4 D7

Air Cond Ovbd Exh Valve, Cont P6-4 D1

Air Cond Ovbd Exh Vlv, Recon Cont P6-4 D2

Air Cond Overheat (6-7) P6-4 C4

Air Cond Pack Cont Valve, Left P6-4 C6

Air Cond Pack Cont Valve, Right P6-4 C5

Air Cond Pack Cont, Lt Elect AC (8) P6-4 A11

Air Cond Pack Cont, Lt Elect DC (8) P6-4 A9

Air Cond Pack Cont, Rt Elect AC (8) P6-4 B11

Air Cond Pack Cont, Rt Elect DC (8) P6-4 B9

Air Cond Pack/Eng Bleed Air, Oht, Lt P6-4 C8

Air Cond Pack/Eng Bleed Air, Oht, Rt P6-4 C7

Air Cond Ram Air Mod Cont, Left P6-4 A8Air Cond Ram Air Mod Cont, Right P6-4 B8

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