 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Bzn local controller described conflict event at 2000 between pattern traffic and IFR arrival when ZLA failed to coordination per LOA requirements.
| Attributes | |
| ACN | 791085 |
| Time | |
| Date | 200806 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bzn.airport |
| State Reference | MT |
| Altitude | agl single value : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : bzn.tower tower : sfb.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series 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 | tower : bzn.tower |
| Operator | general aviation : personal |
| Make Model Name | DA40 Diamond Star |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar controller : non radar |
| Experience | controller non radar : 2 controller radar : 2 controller time certified in position1 : 1 |
| ASRS Report | 791085 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Miss Distance | vertical : 1000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure |
Narrative:
Working local control during a moderate traffic session. Had 4 aircraft sequenced for arrival. ZLC sector 6 is responsible for sequence of IFR traffic. There is no radar display in the tower. Salt lake LOA states that aircraft must be switched to tower prior to 10 mi unless otherwise coordination or if they have time. The LOA is expired and needs updating. While working local control I had 1 aircraft on final and 1 turning base to final (DA40). (DH8) calls on a 6 mi final descending rapidly due to altitude. I had to take action to move the DA40 off of final to avoid a near miss. Salt lake inbound the DH8D 30 mi to the west but did not switch the aircraft until 6 mi final at bzn. This is a common occurrence and in my view is very unsafe. We have tried to mediate the problem with salt lake but it seems no action has been taken to remedy the problem.
Original NASA ASRS Text
Title: BZN LCL CTLR DESCRIBED CONFLICT EVENT AT 2000 BETWEEN PATTERN TFC AND IFR ARR WHEN ZLA FAILED TO COORD PER LOA REQUIREMENTS.
Narrative: WORKING LCL CTL DURING A MODERATE TFC SESSION. HAD 4 ACFT SEQUENCED FOR ARR. ZLC SECTOR 6 IS RESPONSIBLE FOR SEQUENCE OF IFR TFC. THERE IS NO RADAR DISPLAY IN THE TWR. SALT LAKE LOA STATES THAT ACFT MUST BE SWITCHED TO TWR PRIOR TO 10 MI UNLESS OTHERWISE COORD OR IF THEY HAVE TIME. THE LOA IS EXPIRED AND NEEDS UPDATING. WHILE WORKING LCL CTL I HAD 1 ACFT ON FINAL AND 1 TURNING BASE TO FINAL (DA40). (DH8) CALLS ON A 6 MI FINAL DSNDING RAPIDLY DUE TO ALT. I HAD TO TAKE ACTION TO MOVE THE DA40 OFF OF FINAL TO AVOID A NEAR MISS. SALT LAKE INBOUND THE DH8D 30 MI TO THE W BUT DID NOT SWITCH THE ACFT UNTIL 6 MI FINAL AT BZN. THIS IS A COMMON OCCURRENCE AND IN MY VIEW IS VERY UNSAFE. WE HAVE TRIED TO MEDIATE THE PROB WITH SALT LAKE BUT IT SEEMS NO ACTION HAS BEEN TAKEN TO REMEDY THE PROB.
Data retrieved from NASA's ASRS site as of May 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.