FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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A contaminated carbon monoxide portable test unit would be returned to service by

Cleaning the exterior
Replacing the battery
Installing a new indicating element
Recalibrating the sensor

The correct answer is: Installing a new indicating element

The other options are incorrect because they do not address the issue of a contaminated carbon monoxide portable test unit. Cleaning the exterior may help with general maintenance, but it will not solve the problem of contamination. Replacing the battery may improve the overall functionality of the unit, but it will not specifically address the contamination issue. Recalibrating the sensor may also improve the accuracy of the readings, but it will not eliminate the contamination. Installing a new indicating element specifically targets the contamination problem and is the best solution for returning the unit to service.