Narrative:

On final approach to runway xx a cessna citation 525B was observed approx 200 ft directly overhead; overtaking my position.the cessna took evasive action; climbing and turning west. I continued my descent; and turned southbound.tower had initially instructed me to enter a base leg; later revising my clearance to proceed directly to the runway numbers. I was given a landing clearance; and advised that there was traffic on base that would be entering a 1 mile final. While one mile from the airport a citation jet was observed descending approximately 200 ft directly overhead on a northwesterly heading. Multiple position reports were requested and given to the tower from 5 miles. GPS was used to verify the accuracy of the position reports.I do not recall any traffic alert from the tower. My passenger advised that he did hear an alert from our ads-B 978 receiver at the time of the near miss. Our aircraft was also equipped with a 1090ES transponder; along with a compliant position source that was transmitting position at the time; and is ads-B compliant.the citation jet was returning to the airport after a go around precipitated by birds on the runway.I discussed the incident with the cessna pilot and called the tower via telephone to discuss the incident. The cessna pilot advised that he was also given a landing clearance; and was not aware of another aircraft that was cleared to land prior to him. The controller advised that he misjudged the speed of the citation as he was not accustomed to visually judging the speed of aircraft as he normally worked in a radar equipped tower. The tower was a temporary facility.had the controller possessed at least an ipad with an inexpensive ads-B receiver such as a garmin gdl-39 he would have had access to position and speed information.

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Original NASA ASRS Text

Title: Sport Cruiser pilot reported a near midair collision with a Citation Jet while on final approach.

Narrative: On Final approach to Runway XX a Cessna Citation 525B was observed approx 200 ft directly overhead; overtaking my position.The Cessna took evasive action; climbing and turning West. I continued my descent; and turned southbound.Tower had initially instructed me to enter a base leg; later revising my clearance to proceed directly to the runway numbers. I was given a landing clearance; and advised that there was traffic on base that would be entering a 1 mile final. While one mile from the airport a Citation Jet was observed descending approximately 200 ft directly overhead on a northwesterly heading. Multiple position reports were requested and given to the tower from 5 miles. GPS was used to verify the accuracy of the position reports.I do not recall any traffic alert from the tower. My passenger advised that he did hear an alert from our ADS-B 978 receiver at the time of the near miss. Our aircraft was also equipped with a 1090ES transponder; along with a compliant position source that was transmitting position at the time; and is ADS-B compliant.The Citation Jet was returning to the airport after a go around precipitated by birds on the runway.I discussed the incident with the Cessna pilot and called the tower via telephone to discuss the incident. The Cessna pilot advised that he was also given a landing clearance; and was not aware of another aircraft that was cleared to land prior to him. The controller advised that he misjudged the speed of the Citation as he was not accustomed to visually judging the speed of aircraft as he normally worked in a radar equipped tower. The tower was a temporary facility.Had the controller possessed at least an iPad with an inexpensive ADS-B receiver such as a Garmin GDL-39 he would have had access to position and speed information.

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.