The primary purpose of the electrical system is __ of primary or secondary electrical power for operation.
The High Power Switching Modules provide power to __, __, and __.
Circuit Breaker Panels
Electrical Load Centers
Environmental Control System.
The Electrical load centers provide __ protection, __ control logic, and __ power distribution for AC, DC, and battery power requirements.
The Utility Relay Panel provides __ capability for the current sensing contactors in each __. Also provides __ capability for each __ contactor. The panel is disabled when a/c is __.
The master ignition pannel consists of three position switches controlled by the pilot.
OFF, BAT, EXT
The AC electrical system consists of __ generators and __ GCUs (Ground Control Units). Generators are mounted on and are driven by the XMSN __. Each one can supply __ electrical power. The GCUs manages __ to satisfy electrical power requirements. After the APU is started at __%RPM, GCU energizes primary bus contactor. It provides generator protection by disconnecting generator for the following: Undervoltage (__+-__VAC or less) Overvoltage (__+-__VAC or more), underfrequency, overcurrent, and feeder __ between the generator output and system loads.
The DC electrical system provides __VDC power for the A/C converting power from the HPSM to regulated __VDC. It consists of __ regulated transformer rectifier units.
The Transformer Rectifier Units is the primary source of __ power. In the event of dual failure, the __ will supply all DC loads.
The APU drives the accessory section of the main __, which provide HDY pressure, __, and __ power. It supplies air to the __. The fuel consumption is approximately __lbs per hour.
What are the automatic shutdown features for the APU? LOLOLO
Loss of speed sensor signal
Loss of Temp signal
Low oil pressure
The APU Load Control Valve opens when the APU reaches __%. It will close when the APU is __ or when APU __ __ is pressed.