B737-700
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 139
Confusion; Distraction; Situational Awareness; Workload
Deviation - Altitude Undershoot; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Flight Crew Became Reoriented; Flight Crew Regained Aircraft Control; Flight Crew Took Evasive Action
Human Factors; Procedure
Arriving from the north; right base Visual Approach to Runway 31R; were cleared direct to Final Approach Fix; Visual Approach. MCP set to 2200 feet for FAF; autopilot engaged; LNAV engaged; speed 170 knots. Aircraft overshot on runway intercept to between runways and then started correction back to centerline. I was PF and set MCP to zero to keep coming down on GS. Tower saw overshoot and cleared us to land Runway 31L. Lefht correction to line up 31L and got a GPWS call. Tower made an altitude call. Leveled off and re-intercepted GS visual 31L. Normal landing and rollout.
Zeros were set on the MCP; so without joining a course and glideslope; the aircraft kept descending to altitude unknown. ATC saw the overshoot and cleared us to land on 31L. About that same time we got a Caution Too Low Obstacle warning and ATC came on the radio saying they had altitude warning for us because of obstacle clearance altitude. We could see all obstacles because of daylight VMC conditions and promptly corrected altitude and landed Runway 31L without further incident.
A B737-700 was cleared for a visual approach with LNAV engaged to the FAF but after overshooting; zero was set in the MCP Altitude Alert. ATC called low altitude while the EGPWS alerted Caution Too Low Obstacle.