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A saab 2000 flight crew has an near midair collision with a VFR cessna on approach to dto.
| Attributes | |
| ACN | 735488 |
| Time | |
| Date | 200704 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dto.airport |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : dto.tower |
| Operator | general aviation : corporate |
| Make Model Name | Saab 2000 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | ils localizer & glide slope : 17 other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : dto.tower |
| Operator | general aviation : personal |
| Make Model Name | Cessna 340/340A |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine pilot : instrument pilot : cfi |
| Experience | flight time total : 6500 flight time type : 1200 |
| ASRS Report | 735488 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Experience | flight time total : 5000 |
| ASRS Report | 735281 |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Miss Distance | horizontal : 0 vertical : 100 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
As we were approaching dto; we were speaking with ft worth approach control. Approach cleared us for the visual approach to runway 17 in dto (we were approximately 9-10 mi out at this time). We had the airport in sight and also had the ILS tuned up for runway 17. The autoplt was on and the approach mode was active once we were cleared for the approach. The approach controller then switched us to dto tower. We checked in with the tower and he asked us to report our position. We reported that we were 8 mi out; straight in for runway 17. Tower then asked a twin cessna to say his position. The cessna reported that he was on a 6 mi final. Tower reported that he had the cessna in sight. We started to slow and asked the tower what he would like us to do. He said that we were #2 behind the cessna. We did not see the cessna and did not have him on TCAS. We were discussing making a 360 degree turn for spacing. I brought the power levers to idle and reduced the descent rate in search of the cessna. Then I saw the nose of his airplane coming out from directly under us and in front of us. I would estimate that we were within 300 ft or less of the cessna. I immediately started a 360 degree turn to the left and when we told the tower that we needed a left 360 degrees; he replied that he had to clear it with approach (we were already in the turn). We were halfway through the turn when tower called and reported us in sight and wanted to know if we still had the field. Once we rolled around and saw the field again; we reported it and we were cleared to land. At no time did we ever get any TCAS alerts or even an identify on the screen in the area that the cessna was located. After the cessna landed; the tower told him we were on a 1 mi final and to turn left and stay with him. We were actually on a 3 mi final. I believe the incident was caused due to the lack of radar at denton tower and the lack of communication between the tower and the approach control.
Original NASA ASRS Text
Title: A SAAB 2000 FLT CREW HAS AN NMAC WITH A VFR CESSNA ON APPROACH TO DTO.
Narrative: AS WE WERE APCHING DTO; WE WERE SPEAKING WITH FT WORTH APCH CTL. APCH CLRED US FOR THE VISUAL APCH TO RWY 17 IN DTO (WE WERE APPROX 9-10 MI OUT AT THIS TIME). WE HAD THE ARPT IN SIGHT AND ALSO HAD THE ILS TUNED UP FOR RWY 17. THE AUTOPLT WAS ON AND THE APCH MODE WAS ACTIVE ONCE WE WERE CLRED FOR THE APCH. THE APCH CTLR THEN SWITCHED US TO DTO TWR. WE CHKED IN WITH THE TWR AND HE ASKED US TO RPT OUR POS. WE RPTED THAT WE WERE 8 MI OUT; STRAIGHT IN FOR RWY 17. TWR THEN ASKED A TWIN CESSNA TO SAY HIS POS. THE CESSNA RPTED THAT HE WAS ON A 6 MI FINAL. TWR RPTED THAT HE HAD THE CESSNA IN SIGHT. WE STARTED TO SLOW AND ASKED THE TWR WHAT HE WOULD LIKE US TO DO. HE SAID THAT WE WERE #2 BEHIND THE CESSNA. WE DID NOT SEE THE CESSNA AND DID NOT HAVE HIM ON TCAS. WE WERE DISCUSSING MAKING A 360 DEG TURN FOR SPACING. I BROUGHT THE PWR LEVERS TO IDLE AND REDUCED THE DSCNT RATE IN SEARCH OF THE CESSNA. THEN I SAW THE NOSE OF HIS AIRPLANE COMING OUT FROM DIRECTLY UNDER US AND IN FRONT OF US. I WOULD ESTIMATE THAT WE WERE WITHIN 300 FT OR LESS OF THE CESSNA. I IMMEDIATELY STARTED A 360 DEG TURN TO THE L AND WHEN WE TOLD THE TWR THAT WE NEEDED A L 360 DEGS; HE REPLIED THAT HE HAD TO CLR IT WITH APCH (WE WERE ALREADY IN THE TURN). WE WERE HALFWAY THROUGH THE TURN WHEN TWR CALLED AND RPTED US IN SIGHT AND WANTED TO KNOW IF WE STILL HAD THE FIELD. ONCE WE ROLLED AROUND AND SAW THE FIELD AGAIN; WE RPTED IT AND WE WERE CLRED TO LAND. AT NO TIME DID WE EVER GET ANY TCAS ALERTS OR EVEN AN IDENT ON THE SCREEN IN THE AREA THAT THE CESSNA WAS LOCATED. AFTER THE CESSNA LANDED; THE TWR TOLD HIM WE WERE ON A 1 MI FINAL AND TO TURN L AND STAY WITH HIM. WE WERE ACTUALLY ON A 3 MI FINAL. I BELIEVE THE INCIDENT WAS CAUSED DUE TO THE LACK OF RADAR AT DENTON TWR AND THE LACK OF COM BTWN THE TWR AND THE APCH CTL.
Data retrieved from NASA's ASRS site as of January 2009 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.