AM AM Electrical Systems & Avionics

Question 1

What is the standard voltage for most general aviation aircraft DC electrical systems?

Accepted Answer

28 volts

Answer

Most general aviation aircraft use a 28-volt DC electrical system, which is the FAA and MIL-SPEC standard.

Question 2

Which FAR part governs the airworthiness standards for aircraft electrical equipment?

Accepted Answer

FAR Part 23

Answer

FAR Part 23 establishes airworthiness standards for normal, utility, acrobatic, and commuter category airplanes, including electrical systems.

Question 3

What type of wire is required in aircraft electrical systems to prevent fire hazard in fuel tank areas?

Accepted Answer

Teflon-insulated wire

Answer

Teflon (PTFE)-insulated wire is required near fuel tanks because it is highly resistant to fuel, heat, and flame.

Question 4

An ammeter that reads on the discharge side of zero indicates the aircraft battery is:

Accepted Answer

Discharging to supply the bus

Answer

A negative (discharge) ammeter reading means the battery is supplying current to the bus because the alternator output is insufficient.

Question 5

What is the primary purpose of a current limiter in an aircraft electrical circuit?

Accepted Answer

Protect wiring from overload

Answer

A current limiter (fusible link) opens the circuit to protect wiring from damage caused by excessive current flow.

(AM) Aircraft Maintenance Certification Practice Test