Air carrier flight crew on a visual approach to LAN Runway 28L reported there is an uncharted tower that is in close proximity to a charted tower that caused the EGPWS to alert.
Synopsis
Air carrier flight crew on a visual approach to LAN Runway 28L reported there is an uncharted tower that is in close proximity to a charted tower that caused the EGPWS to alert.
Narrative
On downwind at 3;000 feet for Runway 28L we were cleared for the visual approach. On the approach plate I determined and communicated that an obstacle was charted at approximately 1;900 feet and ahead of us; and we began to look for it. We noticed a tall tower which we believed to be that obstacle; and I determined that we would remain south and above it until we turned base. I set 2;400 for the final approach fix altitude and descended. However; when passing that tower we simultaneously noticed another tower straight ahead. In the next few moments; and before we were able to make a determination about which obstacle was which; we received an Enhanced Ground Proximity Warning System (EGPWS) caution for an obstacle ahead. I initiated a climb back to 3;000 feet. Tower advised us of a low-altitude alert to which we responded that we were climbing. Upon reaching 3;000 feet we continued the approach with our base turn. The aircraft continued to land uneventfully.Cause: We believed that we had the charted obstacle in sight and had a plan to avoid it. However; the tower that we believed to be the charted obstacle was instead a different tower that we did not see on our charts; and the charted tower was in our flight path; though below our altitude.Suggestions: The Jeppesen approach plate for the ILS 28L shows only one primary obstacle in that area. It is charted at 1;923 feet. However; there is another tower very similar to that obstacle in close proximity; slightly to the northwest; that is not charted. I believe that this caused confusion and detracted from our situational awareness as a crew.
Second reporter narrative
[Report narrative contained no additional information.]
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.