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Near midair collision between a fokker 28 turning base leg and a helicopter climbing to the same altitude to which the F28 was descending. The helicopter was not equipped with transponder and approach controller had not had any interfacility coordination from the airport tower regarding the helicopter's presence.
| Attributes | |
| ACN | 518782 |
| Time | |
| Date | 200107 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : boi.airport |
| State Reference | ID |
| Altitude | msl single value : 5500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : boi.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | F28 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : boi.tracon |
| Operator | general aviation : personal other |
| Make Model Name | Helicopter |
| Flight Phase | climbout : intermediate altitude climbout : initial |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 150 flight time total : 2800 flight time type : 800 |
| ASRS Report | 518782 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne critical conflict : nmac |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure |
Narrative:
While talking with boi approach, we were on left downwind and cleared for a visual approach to runway 28R. As I started my base turn, the captain shouted 'don't hit that helicopter.' we passed directly over the top of, and less than 500 ft from, a large helicopter. The approach controller did not advise us of any traffic in the area. She was very busy, handling 2 frequencys, with a number of GA and air carrier operations. The helicopter had departed without a transponder. On their initial call-up, the approach controller did not see them on radar and seemed unaware/unsure of the helicopter's location. Since it (the helicopter) departed without a transponder, we received no TCASII information. We were descending through 5500 ft MSL as the helicopter was climbing to 5500 ft MSL. We stopped our descent and increased our turn rate to avoid a collision. Once on the ground, we called the approach facility to talk about the incident and they were totally unaware of any conflict.
Original NASA ASRS Text
Title: NMAC BTWN A FOKKER 28 TURNING BASE LEG AND A HELI CLBING TO THE SAME ALT TO WHICH THE F28 WAS DSNDING. THE HELI WAS NOT EQUIPPED WITH XPONDER AND APCH CTLR HAD NOT HAD ANY INTERFAC COORD FROM THE ARPT TWR REGARDING THE HELI'S PRESENCE.
Narrative: WHILE TALKING WITH BOI APCH, WE WERE ON L DOWNWIND AND CLRED FOR A VISUAL APCH TO RWY 28R. AS I STARTED MY BASE TURN, THE CAPT SHOUTED 'DON'T HIT THAT HELI.' WE PASSED DIRECTLY OVER THE TOP OF, AND LESS THAN 500 FT FROM, A LARGE HELI. THE APCH CTLR DID NOT ADVISE US OF ANY TFC IN THE AREA. SHE WAS VERY BUSY, HANDLING 2 FREQS, WITH A NUMBER OF GA AND ACR OPS. THE HELI HAD DEPARTED WITHOUT A XPONDER. ON THEIR INITIAL CALL-UP, THE APCH CTLR DID NOT SEE THEM ON RADAR AND SEEMED UNAWARE/UNSURE OF THE HELI'S LOCATION. SINCE IT (THE HELI) DEPARTED WITHOUT A XPONDER, WE RECEIVED NO TCASII INFO. WE WERE DSNDING THROUGH 5500 FT MSL AS THE HELI WAS CLBING TO 5500 FT MSL. WE STOPPED OUR DSCNT AND INCREASED OUR TURN RATE TO AVOID A COLLISION. ONCE ON THE GND, WE CALLED THE APCH FACILITY TO TALK ABOUT THE INCIDENT AND THEY WERE TOTALLY UNAWARE OF ANY CONFLICT.
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.