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LM317A: Hot Swapping

Part Number: LM317A

I am using an LM317A regulator in a TO-220 package.  It is being powered by 28 VDC and has a 243 ohm resistor in series between the input voltage and the device.  At the input of the device is a 36 volt zener diode.  The device is configured as a 20 mA current source. Will the device be damaged if I plug the circuit card into a powered backplane?