B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Distraction
Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Flight Crew Returned To Clearance; Flight Crew Became Reoriented
Environment - Non Weather Related; Human Factors; Procedure
On our downwind vector to Runway XXR we were extended for traffic on final. We were told to slow; follow traffic; and were cleared for the visual approach. We extended the final and put 5500 in the altitude window. I was watching the spacing on the traffic while configuring with flaps 15 and gear down. About two miles and at 5500; I disconnected the autopilot. I was concentrating on the runway and traffic and did not notice the sink develop after disconnecting the autopilot. The FO alerted me to it but I was already about 200 ft low as I started a smooth correction. Due to the uneven rising terrain we received a single 'Caution Terrain' alert. I increased the power and climb rate and there were no other alerts. I mistakenly continued the approach and landed. In that split second I forgot the requirement to go-around if the caution is received at night.
I called out the deviation; but feel I waited too long to voice it and should have done it a little sooner.
B737 flight crew reported receiving a terrain warning after descending 200 feet low on a night approach to RNO in an area of rising terrain.