Neal wrote on Jul 28^th, 2008 at 4:03pm:

Without more info on how high you are, what your target altitude is, are you doing an ILS approach? Is the ILS System Set up, is the Runway Course and frequency set in the Radio stack. Are you intercepting the Runway below the Glideslope? Try this: http://www.utem.com/pdf%20Downloads/article%206%20AIRBAG.zip Its a free supliment.

Thank you so much for kind concerning and reply
after your reply, I try again. The situation head keep up and down start after I press the B botton to reset altimeter. I forgot during descending or after a descending stage finished and before another descending stage. I'll try again to make sure.
Thanks again   if you know what mistake I made, please let me know