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A B727 first officer makes too early a turn onto the localizer when the captain reads an incorrect 'led' display on the VOR DME.
| Attributes | |
| ACN | 437369 |
| Time | |
| Date | 199905 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : las.vortac |
| State Reference | NV |
| Altitude | msl single value : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : l30.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer only : 25l other vortac |
| Flight Phase | descent : approach descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 10000 flight time type : 2500 |
| ASRS Report | 437369 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : radar other controllera |
| Resolutory Action | controller : issued new clearance controller : issued advisory |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance Environmental Factor Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Was given a heading to intercept a radial, to intercept the localizer runway 25L at a DME fix off las VOR. First officer was flying with his radios set for localizer. My radio was set for the DME fix off the VOR. At 6 DME we were instructed to turn to a heading. I looked down at my DME and it showed '6,' so I told the first officer we were there, start the turn. Shortly after the turn the controller informed us we had started our turn early. I looked down and showed 5.5 DME, but I noticed the led next to the '6' digit was blank. When I tapped on the readout, the digit illuminated and showed a '1.' we had in fact turned at '16' DME not '6.' the controller gave us another turn back. Factors contributing -- ATC had changed our route and runway, and arrival procedure 4 times in 10 mins, leaving us too rushed to program GPS as a back-up.
Original NASA ASRS Text
Title: A B727 FO MAKES TOO EARLY A TURN ONTO THE LOC WHEN THE CAPT READS AN INCORRECT 'LED' DISPLAY ON THE VOR DME.
Narrative: WAS GIVEN A HEADING TO INTERCEPT A RADIAL, TO INTERCEPT THE LOC RWY 25L AT A DME FIX OFF LAS VOR. FO WAS FLYING WITH HIS RADIOS SET FOR LOC. MY RADIO WAS SET FOR THE DME FIX OFF THE VOR. AT 6 DME WE WERE INSTRUCTED TO TURN TO A HEADING. I LOOKED DOWN AT MY DME AND IT SHOWED '6,' SO I TOLD THE FO WE WERE THERE, START THE TURN. SHORTLY AFTER THE TURN THE CTLR INFORMED US WE HAD STARTED OUR TURN EARLY. I LOOKED DOWN AND SHOWED 5.5 DME, BUT I NOTICED THE LED NEXT TO THE '6' DIGIT WAS BLANK. WHEN I TAPPED ON THE READOUT, THE DIGIT ILLUMINATED AND SHOWED A '1.' WE HAD IN FACT TURNED AT '16' DME NOT '6.' THE CTLR GAVE US ANOTHER TURN BACK. FACTORS CONTRIBUTING -- ATC HAD CHANGED OUR RTE AND RWY, AND ARR PROC 4 TIMES IN 10 MINS, LEAVING US TOO RUSHED TO PROGRAM GPS AS A BACK-UP.
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.