Transponder Operation Under Visual Flight Rules (VFR): Unless otherwise instructed by an ATC facility, adjust transponder to reply on Mode 3/A Code 1200 regardless of altitude. The code is simply a hexadecimal conversion from your registration. I have found the code on the CMS, page 17. The G450 Aircraft Operating Manual mentions the Mode S code in §2B-21-00, page 33, saying it can be found on the MCDU DLK (AOC) STATUS page 3, but that does not appear to be true. Photo: CMS, from Eddie's aircraft.Įxample. The primary target is the "blip" on the controllers radar screen that is nothing more than the aircraft's radar return, while the secondary target is the signal and information beamed from the aircraft's transponder to the radar. SECONDARY RADAR TARGET− A target derived from a transponder return presented on a radar display. PRIMARY RADAR TARGET− An analog or digital target, exclusive of a secondary radar target, presented on a radar display. You will often hear "IFF" from ex-military types when what they mean to say is "transponder." While the IFF found in many military aircraft are much more than just transponders, for our purposes the terms can be considered synonymous. Identification, friend or foe - A device that emits a signal positively identifying it as a friendly.
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