Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Other / Unknown; Communication Breakdown
Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Provided Assistance; Flight Crew Executed Go Around / Missed Approach; Flight Crew Requested ATC Assistance / Clarification; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Human Factors
[We were] descending on the SPUDD arrival and cleared for the visual to runway 28 at KBOI. After seeing the airport and being cleared for the visual we turned toward the localizer and continued descending. My best estimate of altitude was around 6000 feet received a 'terrain pull up' warning from the GPWS. We leveled off and executed the proper terrain avoidance procedure and contemplated continuing the approach but then decided to execute a missed approach. We entered the pattern and came back around to land again on runway 28 uneventfully. I was unfamiliar with the airport and was not yet on the localizer or glideslope as I descended and my closure to the terrain became too rapid. I should have had ATC keep vectoring me until I was on the ILS before calling the visual. I should have stayed higher throughout the visual approach.
Night visual approach to 28R with autopilot off. I was pilot monitoring. During landing checklist; I observed the aircraft was descending below the glideslope. At approximately 5;000 feet MSL; I told the Pilot flying (First Officer) to level and recapture the glideslope. The GPWS then announced 'terrain; pull up' due to the high sink rate and terrain. The FO immediately executed the escape maneuver. We were quickly above the glideslope and minimum altitude. We then considered continuing the approach; but elected to go around. Next approach and landing was uneventful.Failure to maintain on or above the electronic glideslope. Earlier recognition of glideslope deviations. Controlling excessive descent rate above high terrain
Large Transport flight crew reported receiving a terrain warning after descending below the glideslope on a visual approach to BOI.