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Small aircraft aircraft on descent into tower controled airport had near midair collision with another aircraft climbing out from airport. Both aircraft were in communication with tower controller.
| Attributes | |
| ACN | 371864 |
| Time | |
| Date | 199706 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : twf |
| State Reference | ID |
| Altitude | msl bound lower : 5700 msl bound upper : 5700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : twf |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Flight Plan | VFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Experience | flight time last 90 days : 75 flight time total : 1800 flight time type : 150 |
| ASRS Report | 371864 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private |
| Events | |
| Anomaly | conflict : nmac non adherence : far other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 75 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
Narrative:
I was about 3 1/2 NM out inbound on a 45 degree to enter left downwind for runway 7 at twin falls, identification. The other aircraft, a C172 or C182, had departed from runway 7 and was climbing out. We were both on tower frequency. He passed directly below me about 75 ft. After the incident the other pilot stated that he had been informed of my arrival but that he thought I was northeast of the field and not in the location where I was. In fact, I was northeast of the field and the pilot of the other aircraft erroneously believed himself to be north of the field. In my opinion the tower controller did not adequately inform me or the other pilot of our respective locations. In addition, the other pilot erred as to his location.
Original NASA ASRS Text
Title: SMA ACFT ON DSCNT INTO TWR CTLED ARPT HAD NMAC WITH ANOTHER ACFT CLBING OUT FROM ARPT. BOTH ACFT WERE IN COM WITH TWR CTLR.
Narrative: I WAS ABOUT 3 1/2 NM OUT INBOUND ON A 45 DEG TO ENTER L DOWNWIND FOR RWY 7 AT TWIN FALLS, ID. THE OTHER ACFT, A C172 OR C182, HAD DEPARTED FROM RWY 7 AND WAS CLBING OUT. WE WERE BOTH ON TWR FREQ. HE PASSED DIRECTLY BELOW ME ABOUT 75 FT. AFTER THE INCIDENT THE OTHER PLT STATED THAT HE HAD BEEN INFORMED OF MY ARR BUT THAT HE THOUGHT I WAS NE OF THE FIELD AND NOT IN THE LOCATION WHERE I WAS. IN FACT, I WAS NE OF THE FIELD AND THE PLT OF THE OTHER ACFT ERRONEOUSLY BELIEVED HIMSELF TO BE N OF THE FIELD. IN MY OPINION THE TWR CTLR DID NOT ADEQUATELY INFORM ME OR THE OTHER PLT OF OUR RESPECTIVE LOCATIONS. IN ADDITION, THE OTHER PLT ERRED AS TO HIS LOCATION.
Data retrieved from NASA's ASRS site as of July 2007 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.