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Cleared jac ILS. Flight crew of medium large transport started descent after passing over the VOR outbound. Center corrected to maintain 15000' until quirt intersection.
| Attributes | |
| ACN | 126670 |
| Time | |
| Date | 198910 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : jac |
| State Reference | WY |
| Altitude | msl bound lower : 14500 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 |
| Flight Phase | descent : approach descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 4000 flight time type : 1000 |
| ASRS Report | 126670 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 3300 flight time type : 1200 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ZLC had cleared our flight for the ILS approach to runway 18 at jac and to descend and cross the VOR at 15000'. We descended to 15000'. We crossed altitude at quirt. We called departing the VOR and leaving 15000' for 12000'. The center then told us the approach called for us to maintain 15000' until quirt. The descent was stopped and we climbed back to 15000' until quirt. Part of the problem is that the 15000' restriction is hard to find and is not on the profile plan anywhere. All the other approachs to quirt can be made at 12000', except the one over the same course line that allows you to descend to 300'.
Original NASA ASRS Text
Title: CLEARED JAC ILS. FLT CREW OF MLG STARTED DESCENT AFTER PASSING OVER THE VOR OUTBOUND. CENTER CORRECTED TO MAINTAIN 15000' UNTIL QUIRT INTERSECTION.
Narrative: ZLC HAD CLRED OUR FLT FOR THE ILS APCH TO RWY 18 AT JAC AND TO DSND AND CROSS THE VOR AT 15000'. WE DSNDED TO 15000'. WE CROSSED ALT AT QUIRT. WE CALLED DEPARTING THE VOR AND LEAVING 15000' FOR 12000'. THE CENTER THEN TOLD US THE APCH CALLED FOR US TO MAINTAIN 15000' UNTIL QUIRT. THE DSCNT WAS STOPPED AND WE CLBED BACK TO 15000' UNTIL QUIRT. PART OF THE PROB IS THAT THE 15000' RESTRICTION IS HARD TO FIND AND IS NOT ON THE PROFILE PLAN ANYWHERE. ALL THE OTHER APCHS TO QUIRT CAN BE MADE AT 12000', EXCEPT THE ONE OVER THE SAME COURSE LINE THAT ALLOWS YOU TO DSND TO 300'.
Data retrieved from NASA's ASRS site as of August 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.