Pilot’s Manual
PM-126A IV-1
TABLE OF CONTENTS
Electrical Power Systems.......................................................................... 4-1
Introduction............................................................................................ 4-1
General .................................................................................................... 4-1
Main Batteries......................................................................................... 4-2
Emergency Battery................................................................................. 4-3
Generators............................................................................................... 4-4
Generator Control Units .................................................................. 4-5
Ground Power Unit (GPU)................................................................... 4-7
Auxiliary Power Unit (APU)................................................................ 4-8
Electrical Control Panel......................................................................... 4-8
Electrical Switches ............................................................................ 4-9
Electrical System Indicators ............................................................... 4-11
Distribution........................................................................................... 4-13
Split Bus System.............................................................................. 4-16
Generator Buses .............................................................................. 4-16
Main Buses....................................................................................... 4-17
Main Avionics Buses ...................................................................... 4-17
Essential Buses ................................................................................ 4-18
Isolation Contactors........................................................................ 4-18
DC Power Distribution (Figure 4-1).................................................. 4-19
Essential Avionics Buses ................................................................ 4-21
Emergency Battery Bus .................................................................. 4-21
Non-Essential Buses ....................................................................... 4-22
Distribution Summary ................................................................... 4-22
Abnormal Modes of Operation.......................................................... 4-23
Single Generator Failure ................................................................ 4-23
Dual Generator Failure .................................................................. 4-24
Battery Overheat ............................................................................. 4-25
AC Power.............................................................................................. 4-25
Lighting..................................................................................................... 4-26
Introduction.......................................................................................... 4-26
General .................................................................................................. 4-26
Cockpit Lighting .................................................................................. 4-27
Left Crew Lights Panel................................................................... 4-27
Right Crew Lights Panel ................................................................ 4-28
Switch Lighting............................................................................... 4-29
Map Lights ....................................................................................... 4-30
SECTION IV
ELECTRICAL & LIGHTING
Pilot’s Manual
IV-2 PM-126A
TABLE OF CONTENTS (Cont)
Cabin Lighting ..................................................................................... 4-30
Entry/Exit Lights ........................................................................... 4-30
Overhead Lights ............................................................................. 4-31
Passenger Reading and Table Lights ........................................... 4-31
Galley Lights ................................................................................... 4-31
Lavatory Lights............................................................................... 4-32
Baggage/Tailcone Lighting................................................................ 4-33
Emergency Lighting System.............................................................. 4-33
Landing and Taxi Lights..................................................................... 4-34
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