A FLC CAME NEAR AN OBSTRUCTION WHILE ON A VISUAL APCH TO GEG.

Narrative

ARRIVING LATE AT NIGHT TO SPOKANE ARPT; I WAS ANTICIPATING AN ILS APCH TO RWY 21 BASED ON FORECAST WINDS. GEG DOES NOT HAVE AUTOMATED ATIS VIA ACARS; SO I WAS CAUGHT A LITTLE OFF GUARD WHEN WE FINALLY RECEIVED ATIS OVER COM RADIO AND FOUND I WAS SHOOTING A VISUAL APCH TO RWY 25. I ASSUMED THIS WOULD BE AN UNEVENTFUL APCH USING A PAPI FOR VERT GUIDANCE; BUT IN HINDSIGHT I WAS COMPLACENT IN PREPARING FOR A NIGHT VISUAL APCH INTO AN UNFAMILIAR ARPT; AFTER A LONG DAY; WITH FATIGUE SETTING IN (ON DUTY 11 HRS; AWAKE 16 HRS; SHORT SLEEP NIGHT BEFORE). ARRIVING FROM THE E OVER MLP; WE ACQUIRED THE RWY VISUALLY WHILE AT 7000 FT AND APPROX 18 NM FROM ARPT. WE RPTED ARPT IN SIGHT TO APCH CTL AND THEY CLRED US FOR A VISUAL APCH. I SELECTED 4000 FT AND INITIATED A DSCNT TO THIS ALT. AT APPROX 12 NM APCHING 5000 FT; I FINALLY NOTICED VERY TALL LIGHTED TWRS AHEAD AND SLIGHTLY L OF US. I LEVELED OFF AND STATED THIS TO FO. APCH CTL THEN ASKED; 'DO YOU HAVE TWRS IN SIGHT' INDICATING THEY TOO WERE CONCERNED. I THEN INITIATED A CLB UP TO 5500 FT AND VISUALLY CLRED THESE TWRS BY APPROX 1000 FT AND SLIGHTLY TO THE N. ALTHOUGH THIS WAS A VISUAL APCH; I WAS STILL HEADS DOWN IN THE COCKPIT A LOT USING OUR GLASS AUTOMATION (MAP DISPLAY) AND VERT PATH INDICATIONS TO FLY IN TO THE RWY. FMS VERT PATH INDICATIONS SHOWED ME HIGH; SO I WAS DSNDING TO REACQUIRE FMS PATH. THIS COULD HAVE PUT ME IN CONFLICT WITH THESE TWRS. I WAS USING MY FAMILIAR FMS GUIDANCE; WHEN I SHOULD HAVE BEEN HEADS UP USING PAPI AND OUTSIDE VISUAL CUES FOR THIS APCH. FORTUNATELY I DID NOTICE TWRS VISUALLY AND THEY WERE SLIGHTLY S OF OUR COURSE; BUT A CONFLICT COULD EASILY HAVE OCCURRED GIVEN MY MINDSET; UNFAMILIARITY WITH GEG TERRAIN; AND FATIGUE.