Narrative:

This incident happened over santiago peak. I was flying cross-country flight from ral; via dana point to santiago peak. I was flying under VMC and I was under flight advisory with socal on frequency 124.1.when I was over santiago peak socal told me to start my decent because I was approaching my destination. While I was descending socal told me to change frequency to another socal station 134.0. While I was changing the frequency there was another aircraft climbing and turning in the same time towards me. As I mentioned while I was changing is just realized something intercepting me from my left-hand side about 11 o'clock. I had to abruptly pull the yoke toward me to start climbing again because the other aircraft was turning and climbing so I could not turn to the right. He was flying faster than me and had a better rate of climb as well. If I was supposed to descend there would have been a bigger chance to collide and if I would have turned to the right we would have still collided if the pilot on the other aircraft wouldn't have seen me. I could not see any other option then climb and get the aircraft up again. I was so shocked by this incident so I told the socal station on 124.1 that I almost had I mid-air collision. The whole frequency was quiet for about 4-5 seconds and then she replied sorry about that; the traffic is not a factor anymore.I am also aware of that under VMC I am the one who is responsible for collision avoidance but I also think that she should have paid more attention to my area when she told me to decent just a quick look to see if there is another aircraft coming toward me or in the vicinity.this mid-air collision was seconds away from happening if I hadn't taken an evasive action. I'm sending this report in case this might help to improve aviation safety.

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Original NASA ASRS Text

Title: C172 student pilot reported an NMAC after being instructed by SCT to start a descent.

Narrative: This incident happened over Santiago Peak. I was flying cross-country flight from RAL; via Dana point to Santiago Peak. I was flying under VMC and I was under flight advisory with SoCal on frequency 124.1.When I was over Santiago peak SoCal told me to start my decent because I was approaching my destination. While I was descending SoCal told me to change frequency to another SoCal station 134.0. While I was changing the frequency there was another aircraft climbing and turning in the same time towards me. As I mentioned while I was changing is just realized something intercepting me from my left-hand side about 11 o'clock. I had to abruptly pull the yoke toward me to start climbing again because the other aircraft was turning and climbing so I could not turn to the right. He was flying faster than me and had a better rate of climb as well. If I was supposed to descend there would have been a bigger chance to collide and if I would have turned to the right we would have still collided if the pilot on the other aircraft wouldn't have seen me. I could not see any other option then climb and get the aircraft up again. I was so shocked by this incident so I told the SoCal station on 124.1 that I almost had I mid-air collision. The whole frequency was quiet for about 4-5 seconds and then she replied sorry about that; the traffic is not a factor anymore.I am also aware of that under VMC I am the one who is responsible for collision avoidance but I also think that she should have paid more attention to my area when she told me to decent just a quick look to see if there is another aircraft coming toward me or in the vicinity.This mid-air collision was seconds away from happening if I hadn't taken an evasive action. I'm sending this report in case this might help to improve aviation safety.

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.