Medium Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Distraction
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Flight Crew Became Reoriented; Flight Crew Overcame Equipment Problem; Flight Crew Returned To Clearance
Aircraft; Software and Automation
While descending visually into TYS to an assigned altitude; my First Officer was descending at a descent rate that was too high for the aircraft to fully understand that we would be leveling off. The aircraft due to the old technologically that it has thought the descent rate would continue. During the level off at the assigned altitude the aircraft briefly gave a 'Terrain; Terrain' audio caution. [Suggest] newer aircraft with newer technology. Also; my FO could have used a shallower descent rate.
Air carrier Captain reported FO steep approach angle initiated a terrain alert due to older technology limitations.