AET Electrical Troubleshooting 5

Question 1

An aircraft pitot heat circuit draws 8 amps normally but now draws only 2 amps with full voltage applied. This most likely indicates:

Accepted Answer

An open or partial open in the heater element increasing resistance

Answer

Lower-than-normal current with correct voltage indicates increased resistance, such as a partially open or deteriorated heating element.

Question 2

When troubleshooting a faulty fuel quantity indicator, a technician should verify the sender resistance by:

Accepted Answer

Disconnecting the sender and measuring resistance at the sender connector pins

Answer

Disconnecting the sender and measuring its resistance directly verifies whether the sender or indicator is faulty before replacing components.

Question 3

A transponder fails the ramp test for Mode C altitude encoding. After confirming the transponder is serviceable, the technician should check the:

Accepted Answer

Encoding altimeter or blind encoder and associated wiring

Answer

Mode C altitude data comes from the encoding altimeter or blind encoder — a wiring or encoder fault will cause incorrect altitude reporting despite a serviceable transponder.

Question 4

A technician measures 0 ohms between the positive terminal of an aircraft component and aircraft ground with the circuit de-energized. This indicates:

Accepted Answer

A direct short circuit to ground in the component or wiring

Answer

Zero resistance between a positive circuit terminal and ground (with the circuit de-energized) indicates a direct short to ground that would blow fuses or trip breakers when powered.

Question 5

When an aircraft static inverter fails, the FIRST check should be:

Accepted Answer

Verify DC input voltage and current draw at inverter input terminals

Answer

Confirming correct DC input voltage and current establishes whether the inverter is receiving power before diagnosing internal faults.

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET Electrical Troubleshooting 5