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C560 flight crew assume that since they were in VMC, on an IFR GPS-a approach clearance to btm, they were authority/authorized to descend at their discretion until challenged by ZLC.
| Attributes | |
| ACN | 566376 |
| Time | |
| Date | 200211 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | MT |
| Altitude | msl single value : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 110 flight time total : 15000 flight time type : 750 |
| ASRS Report | 566376 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued advisory |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ATC had cleared us for the GPS a approach to btm, to cross hia VOR at 13000 ft. ATC switched us to advisory frequency and we were descending in VMC with the terrain in sight. At 2-3 NM from the hia VOR we began descent below 13000 ft towards 9000 ft (inbound altitude). I was continuing to monitor ZLC in anticipation of canceling IFR, when center advised us that the instructions were to 'cross hia VOR at 13000 ft.' given the fact that we were in VMC, and it is my belief that we were within the protected confines of the approach airspace at all times.
Original NASA ASRS Text
Title: C560 FLC ASSUME THAT SINCE THEY WERE IN VMC, ON AN IFR GPS-A APCH CLRNC TO BTM, THEY WERE AUTH TO DSND AT THEIR DISCRETION UNTIL CHALLENGED BY ZLC.
Narrative: ATC HAD CLRED US FOR THE GPS A APCH TO BTM, TO CROSS HIA VOR AT 13000 FT. ATC SWITCHED US TO ADVISORY FREQ AND WE WERE DSNDING IN VMC WITH THE TERRAIN IN SIGHT. AT 2-3 NM FROM THE HIA VOR WE BEGAN DSCNT BELOW 13000 FT TOWARDS 9000 FT (INBOUND ALT). I WAS CONTINUING TO MONITOR ZLC IN ANTICIPATION OF CANCELING IFR, WHEN CTR ADVISED US THAT THE INSTRUCTIONS WERE TO 'CROSS HIA VOR AT 13000 FT.' GIVEN THE FACT THAT WE WERE IN VMC, AND IT IS MY BELIEF THAT WE WERE WITHIN THE PROTECTED CONFINES OF THE APCH AIRSPACE AT ALL TIMES.
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.