Created: 24 Aug 2015 Updated: 30 Aug 2015

Created: 24 Aug 2015 Updated: 30 Aug 2015
T-6B Electrical System Created: 24 Aug 2015 Updated: 30 Aug 2015

(Utilize electrical system schematic while reviewing this slideshow)
Objectives Identify power sources of electrical system Understand electrical distribution within system Identify location and understand operation of circuit breaker panels (Utilize electrical system schematic while reviewing this slideshow)

References T-6B NATOPS Manual Section 1 Section 5 Section 8, Chapter 4
Electrical Power Supply System Starter/Generator Battery Auxiliary Battery External Power Bus Tie Switch Section 5 Figure 5-1 Instrument Markings Battery/Starter Limitations Generator Limitations Section 8, Chapter 4 Visual Communications

Electrical System Overview
Min 22v Ext Pwr Min 23.5v Batt Start Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Electrical System Overview Starter/Generator (28v/300a hr) EICAS EDM Starter Relay System mainly a DC system System power supplied by Starter/Generator Battery allows for stored power and engine starts Auxiliary Battery utilized as emergency source of power Electric power distributed by numerous electrical bus & avionics bus (separated by battery or generator side) Ability to isolate generator side from battery side through use of Bus Tie Bus Tie Switch Gen Switch GEN Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Bat Bus Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT BAT BUS GEN BUS Avionics Master Switch Charge ON OFF Aft Bat Bus Aft Gen Bus Aux Battery (24v/5a hr) UFCP RH MFD ON OFF Aux Bat Switch IAC # TCAS LH MFD RAD ALT ADC DME IRS XPDR COM 1 BFI COM 2 Fire Det #1 Aux Bat Bus Fwd Avi Bat Bus Fwd Avi Gen Bus CTR MFD CTR MFD Aft Avi Bat Bus Aft Avi Gen Bus LH MFD EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Starter/Generator Air Intake Duct
Power Sources (Starter/Generator) Dual use system as starter or generator 28V/300amp Location Left side of engine accessory compartment Cooled by air intake duct routed from left side of engine cowl Primary aircraft power Generator Control Unit (GCU) Located in rear cockpit, under panel immediately aft of OBOGS regulator Keeps generator output within system limits To Bat Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM To Bat Bus To Gen Bus Charge To Aux Bat Starter/Generator Starter/Generator Air Intake Duct

Power Sources (Starter/Generator) Battery charging
Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Battery charging Generator needs to supply a minimum of 25V to charge battery Bus Tie Switch must be NORM (closed) to allow charging Auxiliary Battery charging Normally generator powers Fwd Bat Bus which in-turn charges Aux Bat Starter/Generator (28v/300a hr) Starter Relay Bus Tie Switch GEN Gen Switch Charge OPEN NORM To Bat Bus To Gen Bus Charge To Aux Bat

Generator Reset Button Amps/Volts Indications
Power Sources (Starter/Generator) Controls & Indicators Right Forward Switch Panel GEN switch and GEN Reset button (both cockpits) Metal flap for turning off Bat & Gen together Magnetic switch Selecting GEN switch “ON” in one cockpit will de-energize/turn switch off in other cockpit Reset button resets generator when generator malfunctions EICAS Information sent to EICAS by EDM Displays system volts and amps in environmental section Positive amps = battery charging Color codes for normal/caution/exceedance A GEN CAS warning illuminates when generator inoperative Limits Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts (notify mx if outside) If generator voltage is continuously below 25V battery power is degraded and land as soon as practical To Bat Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts EDM Starter/Generator (28v/300a hr) EICAS Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM To Bat Bus To Gen Bus Charge To Aux Bat Generator Switch Generator Reset Button Amps/Volts Indications EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Sources (Battery) 24V/42amp, lead-acid battery
Located in left side of engine accessory compartment Provides power for engine starts Provides power to electrical system when generator fails Capable of powering entire system (except air conditioning) 30 min of power with Bus Tie Switch “OPEN” (generator side de-energized) Battery charging Accomplished by generator or external power Generator needs to supply a minimum of 25V to charge battery Bus Tie Switch must be NORM (closed) to allow charging by generator Min 22v Ext Pwr Min 23.5v Batt Start Battery (24v/42a hr) To Hot Bat Bus Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch GEN Gen Switch Charge OPEN NORM To Bat Bus To Gen Bus Charge To Aux Bat Battery EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Amps/Volts Indications
Power Sources (Battery) Controls & Indicators Right Forward Switch Panel BAT switch for power application (both cockpits) Metal flap for turning off Bat & Gen together Magnetic switch Selecting BAT switch “ON” in one cockpit will de-energize/turn switch off in other cockpit EICAS Displays system volts and amps in environmental section Positive amps = battery charging Color codes for normal/caution/exceedance Limits Do not connect external power below 22.0V 23.5V minimum for engine start using battery start Min 22v Ext Pwr Min 23.5v Batt Start Battery (24v/42a hr) To Hot Bat Bus Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch GEN Gen Switch Charge OPEN NORM To Bat Bus To Gen Bus Charge To Aux Bat Battery Switch Amps/Volts Indications EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Sources (Auxiliary Battery) 24V/5amp
Located in left avionic compartment (left E-bay) CB on Battery CB Panel (front cockpit left side) Aux Bat will not charge if CB popped When generator & battery fail, provides power to: Backup Flight Instruments (BFI) Com 2 (standby VHF) Fire detection loop #1 Provides 30 minutes of power Auxiliary Battery charging Normally generator powers Bat Bus which in-turn charges Aux Bat Bus Tie Switch must be NORM (closed) to allow charging Min 22v Ext Pwr Min 23.5v Batt Start Battery (24v/42a hr) To Hot Bat Bus Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM To Bat Bus To Gen Bus Charge Aux Battery (24v/5a hr) Bat CB Panel ON OFF Aux Bat Switch To Aux Bat Bus EICAS Volts Aux Battery 22v 29.5v 32.2v Aux Bat CB Caution Normal Caution Exceedance

Aux Battery Test Switch
Power Sources (Auxiliary Battery) Min 22v Ext Pwr Min 23.5v Batt Start Controls & Indicators Right Forward Switch Panel AUX BAT switch for power application Front cockpit only System Test Panel Tests aux battery power level Hold switch for a minimum of 5 seconds ensuring light remains illuminated Battery (24v/42a hr) To Hot Bat Bus Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch GEN Gen Switch Charge OPEN NORM Aux Battery Switch To Bat Bus To Gen Bus Charge Aux Battery (24v/5a hr) ON OFF Aux Bat Switch Aux Battery Test Light To Aux Bat Bus EICAS Volts Aux Battery Test Switch 22v 29.5v 32.2v Caution Normal Caution Exceedance

External power visual signal External Ground Power Receptacle
Power Sources (External Power) Min 22v Ext Pwr Min 23.5v Batt Start Located on left side, below left avionics bay door Controlled by BAT switch (must be on & minimum of 22V) Connects power to Fwd Bat Bus for distribution to electrical system Internal protection for over/under voltage (automatically disconnects from system) Battery (24v/42a hr) To Hot Bat Bus Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM To Bat Bus To Gen Bus External power visual signal Charge Aux Battery (24v/5a hr) ON OFF External Ground Power Receptacle Aux Bat Switch To Aux Bat Bus EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Distribution (Basic Theory) Electrical Bus Bar
Min 22v Ext Pwr Min 23.5v Batt Start Electrical Bus Bar Main way to mass distribute electricity in a system Physically a “bus” is a metal bar Place various systems on one or numerous electrical bus for ease of isolation or electrical loading Circuit Breaker (CB) Placed between electrical bus and equipment wired to bus Prevents to much current (amps) from damaging equipment Number on CB indicates max amperage at which CB will “pop” Battery (24v/42a hr) To Hot Bat Bus Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay GEN Gen Switch Electrical Bus Bar Bus Tie Switch Charge OPEN NORM To Bat Bus To Gen Bus CB “popped” CB not “popped” Charge Aux Battery (24v/5a hr) ON OFF Aux Bat Switch To Aux Bat Bus EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Distribution (Circuit Breaker Panels) Generator CB Panel
Min 22v Ext Pwr Min 23.5v Batt Start Battery (24v/42a hr) To Hot Bat Bus Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch GEN Gen Switch Charge OPEN NORM To Bat Bus To Gen Bus Generator CB Panel Charge Aux Battery (24v/5a hr) ON OFF Aux Bat Switch To Aux Bat Bus Battery CB Panel EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Distribution (Hot Battery Bus)
Min 22v Ext Pwr Min 23.5v Batt Start Bus has power anytime the Battery is connected and has voltage Items on the bus are considered essential to always have power Circuit breakers in left side of accessory compartment above Battery Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch GEN Gen Switch Charge OPEN NORM To Bat Bus To Gen Bus Charge Aux Battery (24v/5a hr) Hot Bat Bus CB ON OFF Aux Bat Switch To Aux Bat Bus EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Distribution (Forward Generator Bus) Forward Gen Bus Bus Tie
Min 22v Ext Pwr Min 23.5v Batt Start Forward Gen Bus Powered when GEN switch placed ON Powers various systems (air conditioning being highest power consumption) A GEN BUS CAS warning illuminates when Fwd Gen Bus inoperative Bus Tie Switch on right forward switch panel (front cockpit only) Allows Generator to power battery bus side of electrical system NORM position closes relay A BUS TIE CAS caution illuminates when Bus Tie is open or inoperative Generator & Battery Bus are isolated from each other Bat/Aux Bat will not be charged Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch GEN Gen Switch Charge OPEN NORM BUS TIE Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT GEN BUS To Bat Bus Charge Aux Battery (24v/5a hr) ON OFF Aux Bat Switch To Aux Bat Bus EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance Bus Tie Switch

Power Distribution (Forward Battery Bus) Forward Battery Bus
Normally powered by Generator thru Bus Tie Can also be powered by Battery (if Generator failure) Powers some important but basic systems Start up: IAC #1/RH MFD (to get EICAS display) & UFCP (radios) Eng Start: Starter/Boost Pump/Ignition/PMU/EDM Flight: Landing Gear Control/Flap Control/Prop System/Trim Generator charges Aux Bat via the Fwd Bat Bus Generator or Battery powers Aux Bat Bus via the Fwd Bat Bus A BAT BUS CAS warning illuminates when Fwd Bat Bus inoperative or when bus voltage drops below 11.8V Auxiliary Battery Bus Critical items for continued flight during emergencies Backup Flight Instruments (BFI) Com 2 (standby VHF) Fire detection loop #1 CB section labeled “STANBY” on Battery CB Panel to isolate bus items & Aft Aux Bus Normally powered by Generator or Battery via the Fwd Bat Bus Powered by Aux Bat in emergency Gen & Bat inoperative AUX BAT switch ON 30 min of power (time dependent on amount of radio transmissions) Min 22v Ext Pwr Min 23.5v Batt Start Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Bat Bus Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT BAT BUS GEN BUS Charge Aux Battery (24v/5a hr) ON OFF Aux Bat Switch Bat CB Panel BFI COM 2 Fire Det #1 Aux Bat Bus EICAS Volts 22v 29.5v 32.2v Aux Bat Bus Items Caution Normal Caution Exceedance

Power Distribution (Aft Generator & Battery Bus) Aft Generator Bus
Min 22v Ext Pwr Min 23.5v Batt Start Gen CB Panel Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Aft Generator Bus Powered by Fwd Gen Bus CB on Gen CB Panel Can isolate aft bus from front cockpit if single-pilot Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Bat Bus Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT BAT BUS GEN BUS Aft Gen Bus CB Aft Battery Bus Powered by Fwd Bat Bus CB on Bat CB Panel Powers RH MFD & UFCP for rear cockpit Can isolate aft bus from front cockpit if single-pilot Charge Aft Bat Bus Aft Gen Bus Aux Battery (24v/5a hr) UFCP RH MFD ON OFF Aux Bat Switch Bat CB Panel BFI COM 2 Fire Det #1 Aux Bat Bus Aft Bat Bus CB EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Avionics Master Switch
Power Distribution (Avionics) Min 22v Ext Pwr Min 23.5v Batt Start Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Avionics Master Switch On front right switch panel (front cockpit only) De-energizes avionics relays (relays close) allowing power to avionics buses Fwd Bat Bus powers Fwd Avi Bat Bus Fwd Gen Bus powers Fwd Avi Gen Bus Circuit Breaker On Bat CB Panel If CB pops, relays de-energized and close, turning on avionics regardless of switch position Battery (24v/42a hr) Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Bat Bus Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT BAT BUS GEN BUS Avionics Master Switch Charge ON OFF Aft Bat Bus Aft Gen Bus Aux Battery (24v/5a hr) UFCP RH MFD ON OFF Bat CB Panel Aux Bat Switch BFI COM 2 Fire Det #1 Aux Bat Bus To Avi Bat Bus To Avi Gn Bus Avi Master CB Avionics Master Switch EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Distribution (Forward Avi Generator Bus) Powered by Fwd Gen Bus
Min 22v Ext Pwr Min 23.5v Batt Start Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Powered by Fwd Gen Bus Powers important avionics items critical for instrument flight Circuit Breakers CBs on Gen CB Panel Individual CBs for items One CB for entire bus isolation Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Bat Bus Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT BAT BUS GEN BUS Avionics Master Switch Charge ON OFF Aft Bat Bus Aft Gen Bus Aux Battery (24v/5a hr) UFCP RH MFD Gen CB Panel ON OFF Aux Bat Switch Fwd Avi Gen Bus CB IAC # TCAS LH MFD RAD ALT ADC DME IRS XPDR COM 1 BFI COM 2 Fire Det #1 Aux Bat Bus Fwd Avi Gen Bus EICAS Volts Fwd Avi Gen Bus (individual items) 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Distribution (Aft Avi Generator Bus) Powered by Fwd Avi Gen Bus
Min 22v Ext Pwr Min 23.5v Batt Start Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Powered by Fwd Avi Gen Bus Powers LH MFD in aft cockpit Circuit Breakers CB on Gen CB Panel Can isolate aft bus from front cockpit if single-pilot Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch GEN Gen Switch Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Bat Bus Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT BAT BUS GEN BUS Avionics Master Switch Charge ON OFF Aft Bat Bus Aft Gen Bus Aux Battery (24v/5a hr) UFCP RH MFD Gen CB Panel ON OFF Aux Bat Switch IAC # TCAS LH MFD RAD ALT ADC DME IRS XPDR COM 1 BFI COM 2 Fire Det #1 Aux Bat Bus Fwd Avi Gen Bus Aft Avi Gen Bus LH MFD Aft Avi Gen Bus CB EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Distribution (Forward Avi Battery Bus) Powered by Fwd Bat Bus
Min 22v Ext Pwr Min 23.5v Batt Start Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Powered by Fwd Bat Bus Powers Ctr MFD in front cockpit Circuit Breakers CBs on Bat CB Panel Individual CBs for item One CB for entire bus isolation Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Bat Bus Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT BAT BUS GEN BUS Avionics Master Switch Charge ON OFF Aft Bat Bus Aft Gen Bus Aux Battery (24v/5a hr) UFCP RH MFD Bat CB Panel ON OFF Aux Bat Switch IAC # TCAS LH MFD RAD ALT ADC DME IRS XPDR COM 1 BFI COM 2 Fire Det #1 Aux Bat Bus Fwd Avi Bat Bus Fwd Avi Gen Bus CTR MFD Aft Avi Gen Bus LH MFD EICAS Volts Fwd Avi Bat Bus (individual items) Fwd Avi Bat Bus CB 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Distribution (Aft Avi Battery Bus) Powered by Fwd Avi Gen Bus
Min 22v Ext Pwr Min 23.5v Batt Start Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Powered by Fwd Avi Gen Bus Powers Ctr MFD in aft cockpit Circuit Breakers CB on Bat CB Panel Can isolate aft bus from front cockpit if single-pilot Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch GEN Gen Switch Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Bat Bus Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT BAT BUS GEN BUS Avionics Master Switch Charge ON OFF Aft Bat Bus Aft Gen Bus Aux Battery (24v/5a hr) UFCP RH MFD Bat CB Panel ON OFF Aux Bat Switch IAC # TCAS LH MFD RAD ALT ADC DME IRS XPDR COM 1 BFI COM 2 Fire Det #1 Aux Bat Bus Fwd Avi Bat Bus Fwd Avi Gen Bus CTR MFD CTR MFD Aft Avi Bat Bus Aft Avi Gen Bus LH MFD EICAS Volts Aft Avi Bat Bus CB 22v 29.5v 32.2v Caution Normal Caution Exceedance

Power Distribution (Circuit Breaker Review)
Aircraft made to fly single pilot from front cockpit so need the ability to isolate various equipment and buses from front cockpit Battery CB Panel has: Fwd Bat Bus (individual item CBs) Aft Bat Bus (Bus CB) Aux Bat Bus (individual item CBs) Aft Aux Bat Bus (Bus CB) Fwd Avi Bat Bus (Bus CB & individual item CBs) Aft Avi Bat Bus (Bus CB) Min 22v Ext Pwr Min 23.5v Batt Start Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Bat CB Panel Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch Gen Switch GEN Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Bat Bus Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT BAT BUS GEN BUS Generator CB Panel has: Fwd Gen Bus (individual item CBs) Aft Gen Bus (Bus CB) Fwd Avi Gen Bus (Bus CB & individual item CBs) Aft Avi Gen Bus (Bus CB) Avionics Master Switch Charge ON OFF Aft Bat Bus Aft Gen Bus Aux Battery (24v/5a hr) UFCP RH MFD ON OFF Aux Bat Switch Gen CB Panel IAC # TCAS LH MFD RAD ALT ADC DME IRS XPDR COM 1 BFI COM 2 Fire Det #1 Aux Bat Bus Fwd Avi Bat Bus Fwd Avi Gen Bus CTR MFD CTR MFD Aft Avi Bat Bus Aft Avi Gen Bus LH MFD EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Abnormal Electrical Scenarios located in Procedures Section/EPs
Min 22v Ext Pwr Min 23.5v Batt Start Clock ELT Chip Detect Emer Flaps OBOGS Ram Air Valve FDR Mx Batt Switch HotBatBus Battery (24v/42a hr) Ext Pwr Bat Switch BAT Inflight: +50 to -2 amps Ground/Inflight: to 28.5 volts Conclusion Starter/Generator (28v/300a hr) EDM EICAS Starter Relay Bus Tie Switch GEN Gen Switch Identified power sources of electrical system Discussed basic electrical distribution within system Identified and discussed location and operation of circuit breakers Charge OPEN NORM BUS TIE IAC # Ldg Gr Cont UFCP Flap Cont RH MFD Prop Sys PMU Ail/El/Rud Trim EDM Starter Boost Pump Ignition Fwd Gen Bus Air Cond TAD Spd Brk NWS EDM Fuel Bal Fire Det #2 AOA/Pitot/TAT HT Fwd Bat Bus BAT BUS GEN BUS Avionics Master Switch Charge ON OFF Aft Bat Bus Aft Gen Bus Aux Battery (24v/5a hr) UFCP RH MFD ON OFF Aux Bat Switch IAC # TCAS LH MFD RAD ALT ADC DME IRS XPDR COM 1 BFI COM 2 Fire Det #1 Aux Bat Bus Fwd Avi Bat Bus Fwd Avi Gen Bus CTR MFD CTR MFD Aft Avi Bat Bus Aft Avi Gen Bus LH MFD Abnormal Electrical Scenarios located in Procedures Section/EPs EICAS Volts 22v 29.5v 32.2v Caution Normal Caution Exceedance

Created: 24 Aug 2015 Updated: 30 Aug 2015

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Created: 24 Aug 2015 Updated: 30 Aug 2015

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