Dual Xpndr

[jknight8907]

No. What you do is tell them you'll switch to the second transponder, then turn it off. While it's off get back on your altitude, then turn it back on. Makes it look like it was an xpndr problem.

 

[ISaidRightTurns]

I can't figure out why any controller would care about which transponder you were on. I don't think our system gets any mode S info. Just the code and altitude information.

Is this out of a small approach control that they ask for it? Does it happen often?

That's a negative, ATC has had communication with our management. DO says...transponder two for departure, transponder one for arrivals.

When there is problem, the controllers will ask which transponder we are using. Sometimes the pilot staff forgets the rule.

We have two different kind of transponders...I'll ask tomorrow why the ATC has made the request for specific transponder usage. I believe our aircraft is set up with one Mode-S transponder and one regular Mode-C transponder.

There is a difficulty issue and I don't believe our caravans are out climbing ATC's radar capability. IF anything, we might be sending their radar equipment into an ADD mode.

 

[WMUSIGPI]

In the Lear 31a #1 is used when the left seater is flying #2 when the right seater is. It's for RVSM because each is tied to its side's air data computer (altimeter)
Of course the two altimeters are never supposed to be reading far enough apart to make a difference but who knows.