Aircraft Electrical System Maintenance

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What manuals are referenced for aircraft electrical systems maintenance?

Airplane Operation Manual, Engineering Design Manual, Safety Procedures Manual, Maintenance logs

Service Manuals, Flight Operation Manuals, Pilot Manuals, Cabin Crew Manuals

Technical Brochures, Marketing Materials, Customer Support Manuals, Employee Handbooks

Aircraft Maintenance Manual, Wiring Diagrams Manual, Illustrated Parts Catalogue, component vendor manuals (correct)

Under which chapters of the ATA Specification Reference do transport aircraft maintenance manual systems comply?

ATA 50 Cabin Systems and ATA 60 Communications

ATA 15 Fuel Systems and ATA 40 Flight Controls

ATA 20 Standard Practices and ATA 24 Electrical Power (correct)

ATA 10 Engine Systems and ATA 30 Air Conditioning

How is the negative terminal of the aircraft battery typically connected?

Through an intermediary electrical panel

To a separate battery grounding system

To a standalone grounding rod

Directly to the metallic portion of the aircraft structure (correct)

What type of power does a typical large aircraft electrical system make and supply?

AC and DC power Signup and view all the answers

What type of system provides normal and emergency power in an aircraft?

Standby AC and/or DC system Signup and view all the answers

What is the main function of the charge relief valve in the hydraulic system?

Regulate the operating pressure of the charge oil system Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

What triggers the opening of the pressure-operated bypass valve in the oil cooler?

Cold oil reaching a predetermined value Signup and view all the answers

What happens to the oil that is de-aerated in the hydraulic system reservoir?

It supplies the charge pump Signup and view all the answers

What warning does the scavenge filter housing contain to alert of a potential issue?

Differential Pressure Indicator Signup and view all the answers

Why is it crucial not to ignore the warning from the differential pressure indicator?

To check the charge filter for blockage Signup and view all the answers

What is the function of a Ram Air Turbine (RAT) on twin-engine passenger aircraft?

To provide emergency hydraulic and electric power Signup and view all the answers

When does the RAT automatically deploy on some aircraft?

When both engine-driven generators fail Signup and view all the answers

What components make up the hydraulic electrical generating system mentioned in the text?

Hydraulic Constant Speed Motor and AC Generator Signup and view all the answers

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) Signup and view all the answers

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 Signup and view all the answers

What happens if both engine-driven generators fail on an aircraft equipped with a RAT?

The RAT automatically deploys to provide emergency power Signup and view all the answers

What is the main function of the harmonic filter in a static inverter?

Remove everything that is not 400 Hz Signup and view all the answers

Which component ensures that the correct voltage and frequency are maintained in a static inverter?

Regulator circuit Signup and view all the answers

How does a 400 Hz oscillator contribute to a static inverter?

Produces signals with correct timing Signup and view all the answers

Why are static inverters now relatively small and lightweight?

Miniaturisation of electronic components Signup and view all the answers

What role do transformers play in changing AC voltage and current?

Using mutual inductance Signup and view all the answers

Where should static inverters be sent for repair according to the text?

An approved facility equipped for the work Signup and view all the answers

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 Signup and view all the answers

How is the battery charged in a simple single-generator system?

From the bus when the generator output is at a higher voltage Signup and view all the answers

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 Signup and view all the answers

If an AC supply fails in an aircraft system, what would the static inverter do?

Start and provide emergency AC power from the battery Signup and view all the answers

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) Signup and view all the answers

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) Signup and view all the answers