Does anyone remove the RF module when using with AFP? Is it normal for module to heat up during use with simulator?

If your module heats up, it simply means your RF circuit is on. You should remove your module or it will get fried. If you have been using your simulator for an extended period of time with the RF circuit on and the antenna fully retracted, there is a high possibility of damage to the module. Do a range check to confirm that. Which adapter are you using between your 9C and the serial interface ? I presume it's the one from Tower ?

My adapters have been designed in such a way that when you plug it into the trainer port of your 9C, the radio coding circuitry will be activated, but the RF circuitry will be disabled. You do not have to turn the main switch on. You do not have to remove the crystal or module as the radio will not transmit.

Repeated removal of module is not recommended as the solder joints of the long contact pins from the Tx pcb will develop fatigue cracks after some time and cause electrical open or intermittent connection

Here's some info from the Futaba 9C FAQ :

http://www.futabarc.com/faq/faq-9c-q516.html

Thanks, Rajul. I am using the one from Tower. I want to buy the one you make, however, I don't want to send currency thru the mail. Thank you very much for the info. Please let us know when you return to the U.S.

You're most welcomed