Ka8:
" two independent IRSs are installed.........
In their normal navigation mode,the IRSs provide attitude,true and magnetic heading ,acceleration,VERTICAL SPEED,ground speed,track,present position,and wind data to the appropiate airplane systems. ' FCOM 2 11.20.4 NG
also ,14.10.05 ,apr15/88 (older 300 books)
:vertical speed pointer....... indicates zero when IRS vertical speed is unreliable.
I'll try it in a few days in the sim ,and come back with some answer.
Brgds Alex