30 Questions
What manuals are referenced for aircraft electrical systems maintenance?
Aircraft Maintenance Manual, Wiring Diagrams Manual, Illustrated Parts Catalogue, component vendor manuals
Under which chapters of the ATA Specification Reference do transport aircraft maintenance manual systems comply?
ATA 20 Standard Practices and ATA 24 Electrical Power
How is the negative terminal of the aircraft battery typically connected?
Directly to the metallic portion of the aircraft structure
What type of power does a typical large aircraft electrical system make and supply?
AC and DC power
What type of system provides normal and emergency power in an aircraft?
Standby AC and/or DC system
What is the main function of the charge relief valve in the hydraulic system?
Regulate the operating pressure of the charge oil system
Where is the oil cooler located and what does it use to cool the CSD oil?
Located in the reservoir, uses fan air from the engine
What is the purpose of a single-wire earth return system in aircraft?
To provide a return path to the battery through the aircraft structure
What triggers the opening of the pressure-operated bypass valve in the oil cooler?
Cold oil reaching a predetermined value
What happens to the oil that is de-aerated in the hydraulic system reservoir?
It supplies the charge pump
What warning does the scavenge filter housing contain to alert of a potential issue?
Differential Pressure Indicator
Why is it crucial not to ignore the warning from the differential pressure indicator?
To check the charge filter for blockage
What is the function of a Ram Air Turbine (RAT) on twin-engine passenger aircraft?
To provide emergency hydraulic and electric power
When does the RAT automatically deploy on some aircraft?
When both engine-driven generators fail
What components make up the hydraulic electrical generating system mentioned in the text?
Hydraulic Constant Speed Motor and AC Generator
In case both engines or engine-driven hydraulic pumps fail, what supplies hydraulic pressure to the aircraft’s main hydraulic system?
Ram Air Turbine (RAT)
What is the purpose of the Constant Speed Motor in the hydraulic electrical generating system?
To drive the AC generator when the main AC busbars are lost
What happens if both engine-driven generators fail on an aircraft equipped with a RAT?
The RAT automatically deploys to provide emergency power
What is the main function of the harmonic filter in a static inverter?
Remove everything that is not 400 Hz
Which component ensures that the correct voltage and frequency are maintained in a static inverter?
Regulator circuit
How does a 400 Hz oscillator contribute to a static inverter?
Produces signals with correct timing
Why are static inverters now relatively small and lightweight?
Miniaturisation of electronic components
What role do transformers play in changing AC voltage and current?
Using mutual inductance
Where should static inverters be sent for repair according to the text?
An approved facility equipped for the work
What is the purpose of a Bus Tie Breaker (BTB) in a twin-engine split DC bus system?
To couple the power from one bus to the other if a generator fails
How is the battery charged in a simple single-generator system?
From the bus when the generator output is at a higher voltage
What is the function of a Transformer Rectifier Unit (TRU) in a twin-engine split AC bus system?
To supply the DC requirements of the aircraft and charge the battery
If an AC supply fails in an aircraft system, what would the static inverter do?
Start and provide emergency AC power from the battery
What occurs in a split bus configuration when one generator fails?
The failed generator is isolated from its bus and power is coupled to that bus by a Bus Tie Breaker (BTB)
What is unique about a twin-engine split AC bus system compared to other configurations?
AC generators supply individual buses which then feed a Transformer Rectifier Unit (TRU)
Learn about performing maintenance on aircraft electrical systems by referencing various manuals including the Aircraft Maintenance Manual, Wiring Diagrams Manual, Illustrated Parts Catalogue, and component vendor manuals. These systems comply with the Air Transport Association (ATA) Specification Reference under different ATA chapters.
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