Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Workload; Confusion; Distraction
Inflight Event / Encounter CFTT / CFIT
Flight Crew Took Evasive Action
Procedure; Human Factors; Environment - Non Weather Related
On HILIE 2 arrival; cleared direct to SIGYO intersection on the ILS 21 and descend to 6500 ft. Had briefed visual approach Runway 21; backed up with ILS. Terrain awareness had been briefed. Approaching 6500 ft; ridge line and airport was in sight. Shortly thereafter; radar altimeter came alive. At approximately 1900 ft AGL; a momentary 'terrain; terrain' warning was received. Immediately initiated escape maneuver. After a few seconds; the warning ceased and RA indicated above 2500 ft. Climbed approximately 300 ft before discontinuing the maneuver. Terrain and airport were in sight at all times. Balance of approach and landing were uneventful.
Air carrier Captain reported receiving a GPWS terrain waring while on a visual approach to GEG Runway 21. Terrain awareness had been briefed.