Narrative:

VFR runway 28L/right; wind 34008kt; safe/skills check certification in progress 3 aircraft inbound from the north southbound along the shoreline were vertically separated and high did not have one another insight checking on with restriction so I reached out to gain control for descent. Aircraft X was cleared for takeoff monterey 9 departure. Aircraft Y was issued a restriction at or above 3000 12 o'clock less than a mile 2400 entering the downwind. Aircraft Y began a westbound turn my controller in charge (controller in charge) stated she saw the aircraft Y turn the wrong way on the downwind as well as my flm (manager) conducting my safety check and they both stated they wanted to see if I could see my own traffic in the circumstances that I have done something wrong where a cpcit has not; so I'm treated differently than a standard certification check ride. I was scanning my runway as I always do; as I clear an aircraft to land and take off and from the approach end to the departure end everything was all good so I proceeded to transfer communications with my IFR aircraft X than my scan reached the departure end were I saw aircraft Y flying westbound the wrong way on the downwind immediately with no hesitation I issued a right turn away from the traffic eastbound H080. I issued a right turn turn right immediately traffic on the upwind northwest bound over the water leaving 1500 a [small corporate jet sized aircraft] caution wake turbulence. After that norcal called and I responded I gave aircraft Y a right turn heading 080 and he responded he gave a sharp right turn than I issued traffic again aircraft Y reported aircraft X in sight and I have him properly maintain visual separation from that traffic.tower team concept is a big one in any status. I should have at the very least given a traffic pattern entry to aircraft Y; I at the time thought I did but hind sight only gave traffic. Positive control I could have given a heading or a three sixty for sequence; I could have had aircraft Y cross overhead for left traffic.

Related reports:

Google
 

Original NASA ASRS Text

Title: MRY Tower controller reports of a conflict between an IFR departure and a VFR arrival that leads to a loss of separation.

Narrative: VFR Runway 28L/R; Wind 34008kt; Safe/Skills Check Certification in progress 3 aircraft inbound from the north southbound along the shoreline were vertically separated and high did not have one another insight checking on with restriction so I reached out to gain control for descent. Aircraft X was cleared for takeoff Monterey 9 departure. Aircraft Y was issued a restriction at or above 3000 12 o'clock less than a mile 2400 entering the downwind. Aircraft Y began a westbound turn my Controller In Charge (CIC) stated she saw the Aircraft Y turn the wrong way on the downwind as well as my FLM (Manager) conducting my safety check and they both stated they wanted to see if I could see my own traffic in the circumstances that I have done something wrong where a CPCIT has not; so I'm treated differently than a standard certification check ride. I was scanning my runway as I always do; as I clear an aircraft to land and take off and from the approach end to the departure end everything was all good so I proceeded to transfer communications with my IFR Aircraft X than my scan reached the departure end were I saw Aircraft Y flying westbound the wrong way on the downwind immediately with no hesitation I issued a right turn away from the traffic eastbound H080. I issued a right turn turn right immediately traffic on the upwind northwest bound over the water leaving 1500 a [Small corporate jet sized aircraft] caution wake turbulence. After that NorCal called and I responded I gave Aircraft Y a right turn heading 080 and he responded he gave a sharp right turn than I issued traffic again aircraft Y reported Aircraft X in sight and I have him properly maintain visual separation from that traffic.Tower team concept is a big one in any status. I should have at the very least given a traffic pattern entry to Aircraft Y; I at the time thought I did but hind sight only gave traffic. Positive control I could have given a heading or a three sixty for sequence; I could have had Aircraft Y cross overhead for left traffic.

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.