Thank you very much for your support.
How about this:
Go to the Mission Page, button on the flight gen page.
Click on Enable Equipment Damage
Flaps and Gear damage should be enabled.
You may also want to enable failure messages so you know when your flaps ripped off
Now at the bottom of the page pull down the list box: probability induced failures
choose one of the reliability settings, say "Reliable"
Enable/disable the systems you want to wear out and fail.
if you push the engines too hard they may fail.
Glad you are enjoying IF.
Steve