Aviation Mechanic - General, Airframe, and Powerplant › I. General › Task A. Fundamentals of Electricity and Electronics

AM.I.A.S8

Skill

Troubleshoot a circuit.

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Study note

Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Aviation Maintenance Technician Handbook - General p. 12-85
Chapter 12: Fundamentals of Electricity & Electronics › Basic Circuit Analysis & Troubleshooting › Troubleshooting Shorting Faults in Parallel Circuits
Troubleshooting Shorting Faults in Parallel Circuits As in a series circuit, a short in a parallel circuit usually causes an open circuit by blowing the fuse. But, unlike a series circuit, one shorted component in a parallel circuit stops current ... resistor shorts out, there is no time to perform a current or voltage check. Thus, troubleshooting a parallel DC circuit for a shorted component should be accomplished with an ohmmeter. But, as in the case of checking for an open…
Aviation Maintenance Technician Handbook - General p. 12-78
Chapter 12: Fundamentals of Electricity & Electronics › Basic Circuit Analysis & Troubleshooting
Basic Circuit Analysis & Troubleshooting Troubleshooting is the systematic process of recognizing the symptoms of a problem, identifying the possible cause, and locating the failed component or conductor in the circuit. To be proficient at troubleshooting, the technician must understand ... technician to handle many of the common faults encountered in the aircraft. Before starting a discussion on basic circuits and troubleshooting, the following definitions are given. • Short circuit—an unintentional low resistance path between two components in a circuit…
Aviation Maintenance Technician Handbook - General p. 12-84
Chapter 12: Fundamentals of Electricity & Electronics › Basic Circuit Analysis & Troubleshooting › Troubleshooting Open Faults in a Parallel Circuit
Tracing Shorts with the Voltmeter To locate the shorted resistor while the circuit is functioning, a voltmeter can be used. Figure 12-182 illustrates that when a voltmeter is connected across any of the resistors that are not shorted ... shorted resistor, the voltmeter reads zero. Troubleshooting Open Faults in a Parallel Circuit The procedures used in troubleshooting a parallel circuit are sometimes different from those used in a series circuit. Unlike a series circuit, a parallel circuit has more…