002-139 ELEC Flashcards
FSI Splash Screen
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Electrical System
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Lesson Objectives
Discuss
Lesson Organization - System Overview
Discuss
Electrical System
- Power supplied by
- 1 - Main Battery - 44Ah (24V)
- 1 - Aux Battery - 13 Ah, 27Ah, 28 Ah (24 V)
- 2 - Starter Generators
- External Power
Cockpit Controls & Indications
Discuss
- MFD Synoptic Page
- MFD CAS window
- Electrical Panel
Lesson Organization - DC Power
Discuss
DC Power System
External Power * 30.5 Volts Maximum Main Battery * Ni-cad / 24V / 44Ah Aux battery * Ni-Cad / 24 V / 13 Ah, 27Ah, 28 Ah DC Generators *
Main Battery
- Ni-Cad
- 44Ah / 24 Volts
- MAIN BATT HOT = 65*C
- Master Battery Switch connects Main and Aux batteries to the Essential busses (Main Battery = K1 , Aux Battery K2)
- Main Battery Switch connects the Main Battery to the #1 Main Bus (K3)
- K1 Relay - Essential Bus
- K3 Relay - Main Bus 1
- Minimum voltage for start = 23 volts
- Provide power to the Starter/generators for engine starting
Auxiliary Battery
- Ni-Cad / 24 V / 13 Ah, 27Ah, 28 Ah
- AUX BATT HOT = 65*C
- Powers the Battery Bus all of the time
- Aux Battery relay (K4) and master battery (K2) relays connect the aux battery to the ESS BUSSES (K2) and MAIN BUS 2(K4).
- Master Battery Switch connects Main and Aux batteries to the Essential busses (Main Battery = K1 , Aux Battery K2)
Battery Limitations
Discuss information on the slide
External Power
- Right hand nose section
- 3 Pins
- Ext PWR switch connects external power to the Main Bus 1
- EXT POWER DOOR CAS message
- Overvoltage 30.5 Volts the external power is disconnected from the system.
- When External power is introduced to the system, the Starter/Generators and Batteries will be disconnected from the system
Generator Control Units (GCU)
- Located below the baggage compartment
- Maintains 28V DC to the aircraft busses
- 1(2) DC GEN HOT CAS message
- Protection for:
- OVERVOLTAGE
- UNDERVOLTAGE - <5V
- FEEDER FAULT - Deferential feeder current exceeds 125 A
- BUS FAULT - Over current > 550A - Logic will try to clear the fault within 6 seconds if unsuccessful the Starter/Generator will disconnect
- REVERSE CURRENT - >10% of the rated load
DC Starter / Generators
- Installed on the accessory gearbox of its respective engine
- Acts as both a starter and generator.
DC Generator Load Indications
Discuss generator limitations and display.
DC Starter / Generator Limitations
Discuss Starter Generator Limitations
Lesson Organization
Discuss
DC Electrical Load Distribution
Discuss
Power Distribution Panels (PDP)
- Main busses are contained in PDPs
Power Distribution
Discuss power distribution
Main & Essential Buses
Discuss what systems are on the various busses
Services lost during bus failures
Discuss what is lost if a main or non-essential bus fails
Services available after bus failures
Discuss what would be available if the Essential bus was the only power available.
Bus Load Voltage Limitations
Discuss Bus load Limitations
Circuit Breaker Panels
Discuss The circuit breaker panel
Lesson Organization
Discuss slide
Power Distribution Operation
Discuss switchology and symbology of synoptic page
Power Distribution Buses
- Normal Flight - Generators feed the the main buses and allow the batteries to be charged.
- Main buses power the essential and non-essential buses.
- If both generators fail, AUX BAT feeds ESS 1 and ESS 2 MAIN BATT feeds ESS 1 & 2 and Main 1 & 2. Non-essential busses are not powered.
- With external power connected the #1 MAIN BUS is powered and with the BUS TIE closed power is supplied to all BUSES.
- The batteries are not charged when the external power is connected.
Lesson Organization
Discuss
