PLT497: Transponder
What code PLT497 covers, why the FAA tests it, and how to study Transponder before your checkride.
Recall transponder - codes / operations / usage
What this means for your checkride
The transponder replies to radar with a code and, in Mode C, your altitude. You squawk the code ATC assigns, 1200 for VFR, and the special codes 7500 for hijack, 7600 for lost communications, and 7700 for an emergency.
Transponder operation and the emergency codes are tested because they are how ATC sees and separates you, so the FAA checks the codes and Mode C use.
Pilots forget the special codes or when to ident. Reserve 7500, 7600, and 7700 for their exact meanings, and only ident when ATC asks.
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.