Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 59.43; Flight Crew Total 1489.72; Flight Crew Type 1489.72
Situational Awareness; Training / Qualification; Workload
Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Unstabilized Approach
Flight Crew Became Reoriented
Environment - Non Weather Related; Human Factors
While on an OE Refresher flight; I was the PM and my FO student was on his first PF leg in about 9 months due to being non-qualified during the COVID crisis.We were on a right down wind with a clearance to descend 2;000 feet. We were told to stop our descent and we leveled off at 2;600 feet. ATC alerted us to a helicopter crossing our path at 2;000 feet. We reported him in sight and ATC turned us for a right base. When we were clear of the traffic we were cleared to 2;000 feet and then for a visual approach with the airport in sight.  The FO called for gear down just outside the marker and managed the speed at the marker. We were at 170 knots at the time.  We had planned for a flaps 3 landing. With our encounter/interruption with the close traffic we didn't take into account that the marker was 3.4 miles from the runway and at 1;200 AGL. With the glide slope captured and a planned flaps 3 landing the airplane was having a hard time slowing down. I pulled the speed brakes to assist the aircraft and the FO was slowing the airplane down.  I pulled them just inside the marker and stowed them a few seconds later when the airspeed was near Vref. What I didn't realize was I had left them extended below 1;000 feet.  I think part of the issue is the approach seems a little nonstandard (standard: 5 NM; 1;500 feet AGL) and sneaks up on you with the marker at 3.4 NM from the runway at 1;200 feet.
Air Carrier Captain reported an unstable approach.