PLT174: Autopilot Systems
What code PLT174 covers, why the FAA tests it, and how to study Autopilot Systems before your checkride.
Recall autopilot / yaw damper - components / operating principles / characteristics / failure modes
What this means for your checkride
An autopilot flies the airplane by moving the controls to hold or capture pitch, roll, heading, altitude, and navigation modes. It cuts workload but can fail in ways that matter, such as a runaway trim or a mode that does not do what the pilot expects, so you must monitor it and be able to disconnect it fast.
Automation both helps and introduces new errors, so the FAA tests autopilot modes, indications, and failure modes, including how to override it.
Pilots trust the autopilot and stop monitoring. Mode confusion, where the automation is not doing what you think, is a leading trap; verify the active mode and be ready to disconnect.
Where to study it
A code on your test report is an area of deficiency. An authorized instructor must review it with you and endorse that review before you take the practical test, and the examiner may revisit it during the oral. Study it until you can explain it out loud, not just recognize the answer.