DA 40 NG eletric systems

What is the main power source in DA40NG?

A 28V DC electrical system powered primarily by an engine-driven alternator

What is an alternator in aeroplane?

A belt-driven component that converts mechanical engine energy into electrical power ( AC, rectified to DC) to run flight instruments, lights, and avionics while continuously recharging the battery

What does VOLTS do?

• measure electrical pressure (potential difference) pushing electrons through circuit

• Volts represent potential energy

What does Watts do?

• Measure the total power of rate of energy consumption

• Watts represent actual power output

• Watts= Volts x Amps

What is the purpose of battery?

To provide power for an engine start and as a backup in case of alternator failure

What happens if alternator fails?

The aircraft runs on battery power only, requiring load shedding to conserve energy

What is load shedding?

Turning off non-essential electrical equipment to extend battery life

How do you recognise alternator failure?

• Low voltage

• Battery discharging

• Warning annunciation

What is an essential bus?

A bus that supplies critical systems required for a safe flight

What equipment is usually on the essential bus?

• Basic flight instruments

• Communication/ navigation

• Engine monitoring

Short memory pack

• Alternator = main power

• Battery = backup

• Failure → load shedding

• Essential bus = critical systems