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A B727 first officer, on the visual at sat, set up the ILS and followed a false GS which may have caused him to go below the GS before he corrected.
| Attributes | |
| ACN | 457801 |
| Time | |
| Date | 199912 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : sat.airport |
| State Reference | TX |
| Altitude | msl single value : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : sat.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 5000 flight time type : 900 |
| ASRS Report | 457801 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure |
| Independent Detector | other flight crewa other flight crewb other other : 3 |
| Resolutory Action | flight crew : became reoriented |
| Supplementary | |
| Problem Areas | Navigational Facility Aircraft Airport Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Approaching sat from the north, we were cleared for the visual approach for runway 12R. The controller was first vectoring us for runway 12. We asked for runway 12R and he cleared us for the visual. At about 6 mi from the airport, the PNF set localizer frequency for the PF. PF started down to a full scale deflection on ILS. PF left 3000 ft and was descending, when we all noticed we were too low, even with the full fly down needle. It took several seconds to realize we were trying to intercept a 'false' GS. We were too far to the north of the runway to receive a valid signal. We climbed back to a good visual glide path, then turned final and followed GS to a landing. It is likely that we went below an electronic GS where one was available. To correct this, better cockpit discipline is needed. I should have been looking outside more because it was a visual.
Original NASA ASRS Text
Title: A B727 FO, ON THE VISUAL AT SAT, SET UP THE ILS AND FOLLOWED A FALSE GS WHICH MAY HAVE CAUSED HIM TO GO BELOW THE GS BEFORE HE CORRECTED.
Narrative: APCHING SAT FROM THE N, WE WERE CLRED FOR THE VISUAL APCH FOR RWY 12R. THE CTLR WAS FIRST VECTORING US FOR RWY 12. WE ASKED FOR RWY 12R AND HE CLRED US FOR THE VISUAL. AT ABOUT 6 MI FROM THE ARPT, THE PNF SET LOC FREQ FOR THE PF. PF STARTED DOWN TO A FULL SCALE DEFLECTION ON ILS. PF LEFT 3000 FT AND WAS DSNDING, WHEN WE ALL NOTICED WE WERE TOO LOW, EVEN WITH THE FULL FLY DOWN NEEDLE. IT TOOK SEVERAL SECONDS TO REALIZE WE WERE TRYING TO INTERCEPT A 'FALSE' GS. WE WERE TOO FAR TO THE N OF THE RWY TO RECEIVE A VALID SIGNAL. WE CLBED BACK TO A GOOD VISUAL GLIDE PATH, THEN TURNED FINAL AND FOLLOWED GS TO A LNDG. IT IS LIKELY THAT WE WENT BELOW AN ELECTRONIC GS WHERE ONE WAS AVAILABLE. TO CORRECT THIS, BETTER COCKPIT DISCIPLINE IS NEEDED. I SHOULD HAVE BEEN LOOKING OUTSIDE MORE BECAUSE IT WAS A VISUAL.
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.