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Crew controls the electrical system via panels and switches on the overhead and emergency panels.
Electrical system configuration and status are displayed on panels and synoptics.
Details on generators driven by engines, their ratings, and control units.
Information on the Auxiliary Power Unit (APU) generator, its rating, and control.
Description of the 24V DC lead-acid batteries used for DC power storage.
Information on PMA units providing independent power for PFCS and EECs.
Details on the contents of LH and RH Primary Power Distribution Boxes.
Functions and contents of the four Secondary Power Distribution Boxes.
Information about how battery buses are powered and their direct connections.
Details on the Ground Service Bus (GSB) operation and limitations.
Role of PDCU in managing distribution, load shedding, and fault isolation.
28Vdc design for simplification, reliability, and weight considerations.
Architecture choices for engine controllers, PFCS, and RAT integration.
Segregation of electrical energy and automatic control principles.
Fault detection and reporting via ARINC messages to the Central Maintenance Computer.
Pilots manually control the Electrical System via switches on the DC SUPPLY overhead panel.
Details on activating and deactivating engine-driven generators and their synoptic display.
Details on controlling batteries and their abnormal situation indications.
Control and feedback indications for external power connection.
Controls for tying or isolating LH/RH ESS and MAIN buses.
Controls for shedding cabin and galley optional equipment loads.
Controls for LH/RH MASTER and INIT functions for avionics equipment.
Controls for Aural Warnings, BAG FAN, ELEC RH ESS, RAT AUTO, FUEL2 B/U.
Resets RAT GEN in case of disconnection due to over-current.
Handle to manually deploy the RAT, protected by a cover.
Access to RAT test via TEST synoptic page to check GCU, heating, and coupling.
Feedback indications for external power, bus status, and generator contactors.
Displays bus voltages, generator/battery currents, temperature, and circuit breaker status.
Current and temperature indications for batteries with color coding.
Current indications for generators and voltage monitoring for buses.
Summarizes LH/RH bus voltages and generator/battery amperages.
Includes load shedding, generator voltage/current control, bus short-circuit protection, and fuses.
In-flight and ground logic for shedding loads during generator failures or overloads.
SSPC modules for overload protection, with status modifiable by software.
GCU protection for generators and batteries against over/under voltage, overcurrent.
Receptacle for connecting 28VDC external ground power, controlled from Overhead Panel.
Allows energizing systems for check/test via maintenance panel and TEST synoptic.
Procedure to check battery bus tension using a three-position switch on the maintenance panel.
Changing SSPC status (IN, OUT, LOCK) via the circuit breaker page on ground.
General| Display Type | LCD |
|---|---|
| Primary Flight Display (PFD) | Yes |
| Navigation Display (ND) | Yes |
| Engine Indicating and Crew Alerting System (EICAS) | Yes |
| Multifunction Display (MFD) | Yes |
| Display Customization | Yes |
| Display Redundancy | Yes |
| Display Power Supply | 28 VDC |
| Display Storage Temperature | -40°C to +70°C |
| Display Language | Configurable |
| Display Humidity | Up to 95% non-condensing |
| Display Vibration | RTCA/DO-160G compliant |
| Display Shock | RTCA/DO-160G compliant |
| Display EMI/EMC | RTCA/DO-160G compliant |
| Display Manufacturer | Honeywell |
| Display Certification | FAA |
