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Captain of air carrier medium large transport aircraft mistakenly descended below published altitude during transition for an approach.
| Attributes | |
| ACN | 224908 |
| Time | |
| Date | 199210 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : jac |
| State Reference | WY |
| Altitude | msl bound lower : 13500 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 80 flight time total : 11000 flight time type : 700 |
| ASRS Report | 224908 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 170 flight time total : 3000 |
| ASRS Report | 225214 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared by ZLC for ILS runway 18 jac. Level 15000 ft, 100 KTS over VOR. Approach had been briefed to descend to 12000 ft at quirt. When over jac established outbound on 005 degree radial in icing. We misread approach plate and started descent to 12000 ft prior to quirt intersection. Somewhat distracted by icing and desire to change altitude, but basically just screwed up. Center gave us an advisory call on our altitude and I immediately climbed back to 15000 ft. Remainder of approach was uneventful. Further review of approach plate left no doubt of my error. Attaboy for ATC's professionalism!
Original NASA ASRS Text
Title: CAPT OF ACR MLG ACFT MISTAKENLY DSNDED BELOW PUBLISHED ALT DURING TRANSITION FOR AN APCH.
Narrative: CLRED BY ZLC FOR ILS RWY 18 JAC. LEVEL 15000 FT, 100 KTS OVER VOR. APCH HAD BEEN BRIEFED TO DSND TO 12000 FT AT QUIRT. WHEN OVER JAC ESTABLISHED OUTBOUND ON 005 DEG RADIAL IN ICING. WE MISREAD APCH PLATE AND STARTED DSCNT TO 12000 FT PRIOR TO QUIRT INTXN. SOMEWHAT DISTRACTED BY ICING AND DESIRE TO CHANGE ALT, BUT BASICALLY JUST SCREWED UP. CTR GAVE US AN ADVISORY CALL ON OUR ALT AND I IMMEDIATELY CLBED BACK TO 15000 FT. REMAINDER OF APCH WAS UNEVENTFUL. FURTHER REVIEW OF APCH PLATE LEFT NO DOUBT OF MY ERROR. ATTABOY FOR ATC'S PROFESSIONALISM!
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.