chcraft Service Bulletin No. 34.3431. RK-I 18, RK-140 thru RK-224, Hawker Bccchcraft Service Bulletin Nos. 34-3228 and 34-3431. RK-225 thru RK-299, Hawker Beechcraft Service Bulletin No. 34-3431. RK-300 and after as original equipped from Hawker Beechcraft. 7) For aircraft equipped with Universal Avionics Systems Corporation (UASC)