PLT508: VOR
What code PLT508 covers, why the FAA tests it, and how to study VOR before your checkride.
Recall VOR/altimeter/transponder checks - identification / tuning / identifying / logging
What this means for your checkride
Before relying on a VOR for IFR navigation you must check its accuracy and log the check: the date, place, error, and your signature. Approved checks include a VOT test station (needle centered with the correct radial), a designated ground or airborne checkpoint, or a dual-VOR comparison, each with its own allowable error.
An uncalibrated VOR can silently send you off course, so the FAA tests the approved check methods, their tolerances, and the required logging.
Pilots confuse the tolerances. A VOT or ground checkpoint allows up to 4 degrees of error, an airborne check allows 6 degrees, and a dual-VOR check allows 4 degrees between the two; using the wrong limit can pass a VOR that should fail.
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.