Narrative:

On descent into kapc; was cleared for the visual approach 18R. We were approaching from the south so I was entering a right downwind. Norcal asked what or which downwind we were doing; we informed them right downwind and they said a left would work better due to oncoming traffic. I entered the left downwind and at 1;600 MSL was given a low altitude alert. The visual approach was challenging from that point on due to rising terrain on the northeast side of the field. When we landed I checked the AFD and saw that 18R is designated right traffic. Not sure why norcal wanted us on a left downwind instead of giving us or the other aircraft a vector. I will be checking the AFD more diligently from now on and will not let ATC talk me into a corner.

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Original NASA ASRS Text

Title: Corporate jet pilot was issued an ATC clearance contrary to the published airport traffic pattern that led to a challenging approach accompanied by an ATC low altitude alert.

Narrative: On descent into KAPC; was cleared for the visual approach 18R. We were approaching from the south so I was entering a right downwind. NorCal asked what or which downwind we were doing; we informed them right downwind and they said a left would work better due to oncoming traffic. I entered the left downwind and at 1;600 MSL was given a low altitude alert. The visual approach was challenging from that point on due to rising terrain on the northeast side of the field. When we landed I checked the AFD and saw that 18R is designated right traffic. Not sure why NorCal wanted us on a left downwind instead of giving us or the other aircraft a vector. I will be checking the AFD more diligently from now on and will not let ATC talk me into a corner.

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.