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A PA32 at 8000 ft over ida #2 for ILS descended without clearance and conflicted with DHC8 at 6800 ft on the approach.
| Attributes | |
| ACN | 575207 |
| Time | |
| Date | 200303 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ida.airport |
| State Reference | ID |
| Altitude | msl single value : 8000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | common carrier : air taxi |
| Make Model Name | PA-32 Cherokee Six/Lance/Saratoga |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 20 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 575207 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : supervisor |
| Events | |
| Anomaly | conflict : airborne critical non adherence : clearance non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment : conflict alert other controllera other flight crewa other other : 4 |
| Resolutory Action | controller : issued new clearance none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | vertical : 800 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft #1 was told to proceed outbound past ida-VOR -- start procedure turn and expect ILS. Aircraft #2 was inbound on ILS. Descend out of 6800 ft MSL. Aircraft #1 passed ida-VOR and started to descend -- conflict alert activated. Aircraft #1 was told to maintain 8000 ft. Aircraft passed nose to tail at this time. Conflict alert activated and supervisor asked if it was visual separation (common in this area). I advised him -- no -- the aircraft descended a couple hundred ft below his assigned altitude. I was told 'don['T make it complicated, visual.' I did not respond.
Original NASA ASRS Text
Title: A PA32 AT 8000 FT OVER IDA #2 FOR ILS DSNDED WITHOUT CLRNC AND CONFLICTED WITH DHC8 AT 6800 FT ON THE APCH.
Narrative: ACFT #1 WAS TOLD TO PROCEED OUTBOUND PAST IDA-VOR -- START PROC TURN AND EXPECT ILS. ACFT #2 WAS INBOUND ON ILS. DSND OUT OF 6800 FT MSL. ACFT #1 PASSED IDA-VOR AND STARTED TO DSND -- CONFLICT ALERT ACTIVATED. ACFT #1 WAS TOLD TO MAINTAIN 8000 FT. ACFT PASSED NOSE TO TAIL AT THIS TIME. CONFLICT ALERT ACTIVATED AND SUPVR ASKED IF IT WAS VISUAL SEPARATION (COMMON IN THIS AREA). I ADVISED HIM -- NO -- THE ACFT DSNDED A COUPLE HUNDRED FT BELOW HIS ASSIGNED ALT. I WAS TOLD 'DON['T MAKE IT COMPLICATED, VISUAL.' I DID NOT RESPOND.
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.