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Dlesh123 View Drop Down
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Joined: 13 Mar 2015
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    Posted: 07 Jun 2015 at 10:27am
Thanks for clearing that up
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oskrypuch View Drop Down
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Points: 3058 		Post Options Post Options   Thanks (0) Thanks(0)   Quote oskrypuch Quote  Post ReplyReply Direct Link To This Post 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
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Gary T View Drop Down
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Points: 80 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary T Quote  Post ReplyReply Direct Link To This Post 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
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Dlesh123 View Drop Down
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Points: 30 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dlesh123 Quote  Post ReplyReply Direct Link To This Post 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
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