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14 terms

AH 64 Contact Checkride (Electrical System,

STUDY
PLAY
The primary purpose of the electrical system is __ of primary or secondary electrical power for operation.
Distribution
The electrical system manages __, __, __, and __ coming in.
DC
AC
Battery
Power
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.
Circuit
Switching
Secondary
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 __.
reset
HPSM
Trip ECS
airborne
The master ignition pannel consists of three position switches controlled by the pilot.
OFF, BAT, EXT
At 80% charge, the battery will provide power for __ mins at __degrees C.
12
25
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.
2 2
AGB
Enough
Generator
95
99.5 5
125 1.5
fault
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.
28
28
2
The Transformer Rectifier Units is the primary source of __ power. In the event of dual failure, the __ will supply all DC loads.
DC
Battery
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.
XMSN
AC DC
APU
175
What are the automatic shutdown features for the APU? LOLOLO
Loss of speed sensor signal
Over temp
Loss of Temp signal
Over current
Low oil pressure
Overspeed
The APU Load Control Valve opens when the APU reaches __%. It will close when the APU is __ or when APU __ __ is pressed.
95
shutoff
Fire button
The APU Power Takeoff Clutch provides __ and __ of the APU and AGB via the #__ driveshaft. It normally engages at 60% APU speed or above main rotor speed of __to__%Nr.
decoupling
coupling
7
94 96