Electrical Systems Flashcards
Primary power source for the UH-1N _______
Powered by _____ generators that are designed to work as a single power source
28 volts DC
two 30 volt
A ______________ or ______________ is used as an emergency source of power or as an alternate source of power for starting.
24 volt DC nickel cadmium (NiCad) or sealed lead acid battery (SLAB)
DC Starter-Generators:
A _________ starter-generator is mounted to the front of each engine accessory gearbox.
30 volt, 200 amp
__________ are used to distribute electrical power to aircraft systems.
Electrical buses
When power is applied to the DC essential bus, all systems that are _________ for flight are operative.
“essential”
A __________ nickel cadmium (NiCad) or sealed lead acid battery (SLAB) is used as an emergency source of power or as an alternate source of power for starting.
24 volt DC
If an external power source is used during ground operations, its voltage must not exceed __________ volts.
29.5
There are 2 AC (alternating current) inverters that provide _______ volt power for select aircraft systems.
115 ±2.5
The AC inverters supply __________ power to the AC Essential and AC Non-essential Buses.
115 ±2.5 volts AC
The standby AC inverter is powered by the __________ Bus.
DC Non-essential
The voltmeter, located on the instrument panel, monitors __________.
AC and DC voltage simultaneously
An external power caution segment light, located on the Master Caution Panel labeled EXTERNAL PWR, illuminates when __________.
the external power access door is open
In order for a generator to operate at a sufficient speed to produce fully regulated power within the normal voltage range, its respective engine’s compressor speed must be at or above __________.
71% Ng
The __________ system is the only system currently powered by the Non-essential AC Bus.
UHF DF
If both DC generators fail during flight, the battery will provide electrical power for approximately __________ minutes.
12
