Flight Crew Air Transport Pilot (ATP)
Confusion; Situational Awareness; Distraction
Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Unstabilized Approach; Inflight Event / Encounter Weather / Turbulence; Inflight Event / Encounter CFTT / CFIT
Flight Crew Became Reoriented; Flight Crew Took Evasive Action
Weather; Procedure; Human Factors
First day on IOE. Third leg. Vectors to a course to visually pick up the river for the River Visual 19. Just after those instructions we were asked to switch to the LDA Z. After passing the FAF and descending to the MDA we heard an 'Obstacle' aural warning. At this time we broke out of the clouds (unadvertised momentary layer). Checkairmen took controls and performed the GPWS escape maneuver. Momentary stick shaker. Now in visual conditions; obstacle/airport in sight we elected to land with no further incidents.Upon review; we did not catch an intermediate step down fix that was not loaded into the FMS causing us to descend below altitude.
An air carrier Captain flying the DCA LDA Z Runway 19 on IOE; apparently descended below the WEVPU fix altitude and momentarily responded to the EGPWS 'OBSTACLE' alert before becoming VMC and landing.