Chapter 1 Flashcards
(24 cards)
Name the sources of power on an aircraft
1.Batteries fitted to the aircraft
2.Batteries connected to the aircraft while on the ground
3.On-board generation systems
4.Ground power generation systems that are connected to the aircraft while on the ground
What are the two types of batteries
Secondary cells
Primary cells
What is a primary cell
Discharge of energy only once
Battery cannot be used any further
What is a secondary cells
Rechargeable by connecting dc voltage across the battery terminal at a slightly higher voltage than the battery output voltage
What are the two types of chemical cell
Lead acid
Alkaline or nickel-cadmium cell
What is better a lead or alkaline batteries
Alkaline
Can be left in a partially or full discharged state which causing damage
What are the alkaline batteries disadvantages
High initial cost
What are the battery identification
Alkaline - light blue
Lead acid- pink or green
What are the potential hazards to batteries
Electrolytes highly chemically reactive& corrosive
Give of hydrogen gas
Rise to high temps
What maintenance should be made on batteries
Voltage checks
Examinations
Replacements if found damaged
How is thermal runaway caused
Separator breakdown due to age
Constant loss of electrolytes
Internal short circuits due to contamination
Overcharging
Name the different types of busbars
Battery
Vital
Essential
Non- essential
Main AC
What is placed instead of a fuse during maintains so anothing isn’t put in there
Yellow dummy fuse , as a warning
Why are circuit breakers used instead
Can be reset after work unlike fuses
What are the primary sources of power for an aircraft
Aircraft generators
Ground power units
Auxiliary ( APU)
Faults to be monitors in a Generator Control Unit
Over voltage
Under voltage
Over frequency
Under frequency
What does a transformer do
Convert voltage AC to AC
What does a transformer rectifier unit do
Convert AC to DC
What does invertors do
Convert DC to AC
What are the two methods do inverters use
Rotary - mechanical
Static - solid state
What ground power connectors are used
NATO standard connector
What are potential dangers to not bonding
Fire risk
Interference to coms equipment
Danger to personnel
