Narrative:

During a visual approach to runway 24 at san bernadino (sbd) we received a resolution advisory (RA) for traffic off the nose 500 ft above and descending. The crew saw the TCAS contact after beginning the base turn. At this time there was no advantage to a turn in either direction without visually acquiring the aircraft. The pilot flying; not having the TCAS contact in sight; continued the left turn and increased the rate of descent to provide more separation from the TCAS contact. A few seconds later we received the RA with the 'descend...descend' aural alert. During the RA the crew observed '+3' on the TCAS indicating an altitude difference of 300 ft. We did not see the other aircraft throughout the entire event. The incident was reported to sbd tower by radio on short final and by telephone following engine shutdown.this was our first experience flying into sbd. Redlands airport (rei) is approximately 4 NM east of the field. That may have been the source of the traffic. After speaking with tower by phone I found out they have no radar or radar repeater capability and therefore provide no traffic separation. I would suggest that when sbd tower clears aircraft for the visual approach to runway 24 they notify them of the proximity of redlands airport and to use caution. I would recommend that due to their proximity a common frequency for traffic to monitor would be useful. There should also be a caution published in the af/D and notams.note: the horizontal miss distance in the form above is unknown. We never had the other aircraft in sight to give an actual estimate. That being said the RA and our aircraft appeared co-located on the TCAS display.

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Original NASA ASRS Text

Title: Corporate Jet transport Captain reported a NMAC on approach to SBD airport that may have been associated with traffic at REI airport.

Narrative: During a visual approach to runway 24 at San Bernadino (SBD) we received a Resolution Advisory (RA) for traffic off the nose 500 ft above and descending. The crew saw the TCAS contact after beginning the base turn. At this time there was no advantage to a turn in either direction without visually acquiring the aircraft. The pilot flying; not having the TCAS contact in sight; continued the left turn and increased the rate of descent to provide more separation from the TCAS contact. A few seconds later we received the RA with the 'Descend...Descend' aural alert. During the RA the crew observed '+3' on the TCAS indicating an altitude difference of 300 ft. We did not see the other aircraft throughout the entire event. The incident was reported to SBD tower by radio on short final and by telephone following engine shutdown.This was our first experience flying into SBD. Redlands airport (REI) is approximately 4 NM east of the field. That may have been the source of the traffic. After speaking with tower by phone I found out they have no radar or radar repeater capability and therefore provide no traffic separation. I would suggest that when SBD tower clears aircraft for the visual approach to runway 24 they notify them of the proximity of Redlands airport and to use caution. I would recommend that due to their proximity a common frequency for traffic to monitor would be useful. There should also be a caution published in the AF/D and Notams.NOTE: The Horizontal miss distance in the form above is unknown. We never had the other aircraft in sight to give an actual estimate. That being said the RA and our aircraft appeared co-located on the TCAS display.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.