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During a night operation ILS approach to runway 34R the B757 flight crew fails to affirm their position prior to starting down prior to plage intersection. The approach controller advises them of a low altitude alert after they arrive at 9000 ft just passing plage, 20 NM south of slc, ut.
| Attributes | |
| ACN | 584143 |
| Time | |
| Date | 200306 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | intersection : plage |
| State Reference | UT |
| Altitude | msl bound lower : 9000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : s56.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 34r |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 3800 flight time type : 300 |
| ASRS Report | 584143 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 70 flight time total : 12000 flight time type : 2000 |
| ASRS Report | 584311 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude altitude deviation : crossing restriction not met non adherence : published procedure non adherence : company policies non adherence : clearance other anomaly other |
| Independent Detector | atc equipment : msaw other controllera |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Airspace Structure Navigational Facility Flight Crew Human Performance Environmental Factor |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On approach into salt lake city, we were informed that the DME for runway 34R was OTS. We were FMS/EFIS equipped and in visual conditions and accepted the approach. We were given a heading to intercept the ILS, to maintain 11000 ft until established on the localizer. Once established, we descended to 9000 ft. Upon reaching 9000 ft, the controller advised us of a 'low altitude alert.' he stated that we had just passed the 'plage' intersection. We should have confirmed our position before starting our descent. The mistake was made when we extended off of the 'scoer' intersection instead of 'plage.' we were in visual conditions during the entire approach and never close to terrain. Supplemental information from acn 584311: on FMS extended approach from 9000 ft fix which eliminated stepdown fix -- intercepted localizer and started down -- informed at 9000 ft fix of position and low altitude alert. 9000 ft was ok if authority/authorized by ATC. Now I always extend out as far as stepdowns for positional awareness -- we were visual and aware of our position and not in danger.
Original NASA ASRS Text
Title: DURING A NIGHT OP ILS APCH TO RWY 34R THE B757 FLT CREW FAILS TO AFFIRM THEIR POS PRIOR TO STARTING DOWN PRIOR TO PLAGE INTXN. THE APCH CTLR ADVISES THEM OF A LOW ALT ALERT AFTER THEY ARRIVE AT 9000 FT JUST PASSING PLAGE, 20 NM S OF SLC, UT.
Narrative: ON APCH INTO SALT LAKE CITY, WE WERE INFORMED THAT THE DME FOR RWY 34R WAS OTS. WE WERE FMS/EFIS EQUIPPED AND IN VISUAL CONDITIONS AND ACCEPTED THE APCH. WE WERE GIVEN A HEADING TO INTERCEPT THE ILS, TO MAINTAIN 11000 FT UNTIL ESTABLISHED ON THE LOC. ONCE ESTABLISHED, WE DSNDED TO 9000 FT. UPON REACHING 9000 FT, THE CTLR ADVISED US OF A 'LOW ALT ALERT.' HE STATED THAT WE HAD JUST PASSED THE 'PLAGE' INTXN. WE SHOULD HAVE CONFIRMED OUR POS BEFORE STARTING OUR DSCNT. THE MISTAKE WAS MADE WHEN WE EXTENDED OFF OF THE 'SCOER' INTXN INSTEAD OF 'PLAGE.' WE WERE IN VISUAL CONDITIONS DURING THE ENTIRE APCH AND NEVER CLOSE TO TERRAIN. SUPPLEMENTAL INFO FROM ACN 584311: ON FMS EXTENDED APCH FROM 9000 FT FIX WHICH ELIMINATED STEPDOWN FIX -- INTERCEPTED LOC AND STARTED DOWN -- INFORMED AT 9000 FT FIX OF POS AND LOW ALT ALERT. 9000 FT WAS OK IF AUTH BY ATC. NOW I ALWAYS EXTEND OUT AS FAR AS STEPDOWNS FOR POSITIONAL AWARENESS -- WE WERE VISUAL AND AWARE OF OUR POS AND NOT IN DANGER.
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.