SAFO1506

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   Now that the FAA has decided that they want the transponder ON for all ground operations at all airports, will there be a SB to disconnect the automatic switch from ground to air that switches the transponder from standby to ON?

Or can that be permanently overridden?

Doug

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Dlesh123 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 13 Mar 2015 Location: Fountain Status: Offline Points: 30	Post Options Post Reply Quote Dlesh123 Report Post Thanks(0) Quote Reply Topic: SAFO1506 Posted: 07 Jun 2015 at 12:27am
	Now that the FAA has decided that they want the transponder ON for all ground operations at all airports, will there be a SB to disconnect the automatic switch from ground to air that switches the transponder from standby to ON? Or can that be permanently overridden? Doug

Gary T Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Nov 2013 Location: Michigan Status: Offline Points: 80	Post Options Post Reply Quote Gary T Report Post Thanks(0) Quote Reply Posted: 07 Jun 2015 at 8:56am
	From the AXP340 owner manual: p.4 & 5 If the installation includes an automatic air/ground input, such as a gear squat switch, IFD540 speed-based air/ground discrete, or similar external input, the AXP340 will start in GND mode on the ground and will automatically transition to ALT mode during takeoff roll/liftoff. GND Mode The transponder is on, but will not reply to any interrogations.The transponder will respond to Mode S ground interrogations from surface movement radar. This mode is only available in installations that send a ground/air discrete signal to transponder. I believe we will be in compliance with the FAA.
	Gary-T

oskrypuch Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 09 Nov 2012 Location: CYFD Status: Offline Points: 3061	Post Options Post Reply Quote oskrypuch Report Post Thanks(0) Quote Reply Posted: 07 Jun 2015 at 9:55am
	Gary is correct. A ModeS transponder (340 included) uses its GND mode for ASDE-X compliance, on the ground. That is preferable to an ALT mode on the ground. * Orest

Dlesh123 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 13 Mar 2015 Location: Fountain Status: Offline Points: 30	Post Options Post Reply Quote Dlesh123 Report Post Thanks(0) Quote Reply Posted: 07 Jun 2015 at 10:27am
	Thanks for clearing that up