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Cpr aircraft descended below assigned altitude and conflicted with another aircraft resulting in less than standard separation.
| Attributes | |
| ACN | 139039 |
| Time | |
| Date | 199003 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : fmn |
| State Reference | NM |
| Altitude | msl bound lower : 12800 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 10500 flight time type : 300 |
| ASRS Report | 139039 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 8600 flight time type : 300 |
| ASRS Report | 138761 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 21600 vertical : 800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was a PIC of a small transport on an IFR flight from phx to fmn. During the approach phase we were told to intercept the 10 DME arc for the ILS 25 at fmn and to expect the approach. We were assigned 13000'. After passing the IAF I mistakenly began a descent. Denver center called as we passed 12800' and reminded us that we were still assigned 13000'. Approximately 10 seconds after being told about the deviation, we were instructed to descend to 10000' and were cleared for the approach. After landing a phone call was made to denver center and we were informed that there was another aircraft 3.6 mi away at 12000' and they would have to report the matter to the FAA. As PIC I was primarily concerned with flying the aircraft. Because we were conducting an approach with IMC below us and 5000' above the proper altitude for G/south interception, the descent was very important. My failure was in two areas. While my copilot was operating the radios, I did not pay enough attention myself to center's instructions. Also, when my copilot suggested the descent I did not stop to confirm that we were indeed cleared for the approach (my copilot honestly thought we had been cleared). As PIC it was my responsibility to verify the clearance prior to making any altitude changes.
Original NASA ASRS Text
Title: CPR ACFT DESCENDED BELOW ASSIGNED ALT AND CONFLICTED WITH ANOTHER ACFT RESULTING IN LTSS.
Narrative: I WAS A PIC OF A SMT ON AN IFR FLT FROM PHX TO FMN. DURING THE APCH PHASE WE WERE TOLD TO INTERCEPT THE 10 DME ARC FOR THE ILS 25 AT FMN AND TO EXPECT THE APCH. WE WERE ASSIGNED 13000'. AFTER PASSING THE IAF I MISTAKENLY BEGAN A DSCNT. DENVER CENTER CALLED AS WE PASSED 12800' AND REMINDED US THAT WE WERE STILL ASSIGNED 13000'. APPROX 10 SECS AFTER BEING TOLD ABOUT THE DEVIATION, WE WERE INSTRUCTED TO DSND TO 10000' AND WERE CLRED FOR THE APCH. AFTER LNDG A PHONE CALL WAS MADE TO DENVER CENTER AND WE WERE INFORMED THAT THERE WAS ANOTHER ACFT 3.6 MI AWAY AT 12000' AND THEY WOULD HAVE TO RPT THE MATTER TO THE FAA. AS PIC I WAS PRIMARILY CONCERNED WITH FLYING THE ACFT. BECAUSE WE WERE CONDUCTING AN APCH WITH IMC BELOW US AND 5000' ABOVE THE PROPER ALT FOR G/S INTERCEPTION, THE DSCNT WAS VERY IMPORTANT. MY FAILURE WAS IN TWO AREAS. WHILE MY COPLT WAS OPERATING THE RADIOS, I DID NOT PAY ENOUGH ATTN MYSELF TO CENTER'S INSTRUCTIONS. ALSO, WHEN MY COPLT SUGGESTED THE DSCNT I DID NOT STOP TO CONFIRM THAT WE WERE INDEED CLRED FOR THE APCH (MY COPLT HONESTLY THOUGHT WE HAD BEEN CLRED). AS PIC IT WAS MY RESPONSIBILITY TO VERIFY THE CLRNC PRIOR TO MAKING ANY ALT CHANGES.
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.