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Near midair collision between a light aircraft and an airline F28 10 mi northwest of bzn, mt. The GA aircraft was intercepting the localizer and the F28 had just called in to the unicom at bzn. The instructor pilot noted the F28 when he passed by at 300 ft. Transponder not on in the GA aircraft.
| Attributes | |
| ACN | 404081 |
| Time | |
| Date | 199806 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bzn |
| State Reference | MT |
| Altitude | msl bound lower : 7300 msl bound upper : 7300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | other |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | None |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | F28 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot instruction : trainee |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time total : 9000 flight time type : 40 |
| ASRS Report | 404081 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : cfi pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : far |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 300 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During a practice ILS approach, an air carrier F28 called in to local bozeman unicom that he was 11 mi west and asked for airport advisory. We were 10.7 mi northwest, intercepting the glideslope on the localizer. My check airman observed the F28 above and slightly to the right of us and not in the landing confign. He said he flew by us quickly. We were flying at 120 KIAS. The F28 pilot said he didn't see us because we didn't have our transponder on so his TCASII would register our position, and we did forget to turn the transponder on prior to takeoff. Probably because we were in a hurry and the usual anxiety associated with check rides. I believe this incident could have been prevented by monitoring and communications with ZLC by both aircraft, turning on the transponder so it registered on TCASII, and more visual observation by F28 pilots and less reliance on TCASII for positive separation.
Original NASA ASRS Text
Title: NMAC BTWN A LIGHT ACFT AND AN AIRLINE F28 10 MI NW OF BZN, MT. THE GA ACFT WAS INTERCEPTING THE LOC AND THE F28 HAD JUST CALLED IN TO THE UNICOM AT BZN. THE INSTRUCTOR PLT NOTED THE F28 WHEN HE PASSED BY AT 300 FT. XPONDER NOT ON IN THE GA ACFT.
Narrative: DURING A PRACTICE ILS APCH, AN ACR F28 CALLED IN TO LCL BOZEMAN UNICOM THAT HE WAS 11 MI W AND ASKED FOR ARPT ADVISORY. WE WERE 10.7 MI NW, INTERCEPTING THE GLIDESLOPE ON THE LOC. MY CHK AIRMAN OBSERVED THE F28 ABOVE AND SLIGHTLY TO THE R OF US AND NOT IN THE LNDG CONFIGN. HE SAID HE FLEW BY US QUICKLY. WE WERE FLYING AT 120 KIAS. THE F28 PLT SAID HE DIDN'T SEE US BECAUSE WE DIDN'T HAVE OUR XPONDER ON SO HIS TCASII WOULD REGISTER OUR POS, AND WE DID FORGET TO TURN THE XPONDER ON PRIOR TO TKOF. PROBABLY BECAUSE WE WERE IN A HURRY AND THE USUAL ANXIETY ASSOCIATED WITH CHK RIDES. I BELIEVE THIS INCIDENT COULD HAVE BEEN PREVENTED BY MONITORING AND COMS WITH ZLC BY BOTH ACFT, TURNING ON THE XPONDER SO IT REGISTERED ON TCASII, AND MORE VISUAL OBSERVATION BY F28 PLTS AND LESS RELIANCE ON TCASII FOR POSITIVE SEPARATION.
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.