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An air carrier B737 flight crew making an approach captured a false GS and started an early, steep, descent. The flight crew recognized the problem at about the same time that the approach controller called about a low altitude alert. They recovered and returned to their approach altitude and intercepted the correct GS for a successful approach and landing. Cftt.
| Attributes | |
| ACN | 372029 |
| Time | |
| Date | 199706 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : pit |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : straight in arrival other enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 23000 flight time type : 3000 |
| ASRS Report | 372029 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | non adherence : published procedure other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
On flight into pit airport on ILS approach runway 28L, we got GS capture and I started descent. We configured and did the landing checklist. I then felt that the descent and DME from airport did not look right and asked the other pilot to back me up on the ILS. At that time, the tower called and said we had an altitude alert. We climbed back to 3000 ft as soon as possible. We then got a valid GS signal -- proceeded on the approach and completed the landing. No further comment was made by the tower. I then called tower supervisor upon arrival at the gate and he said that the ILS was unmonitored during the approach (we had 2 1/2 - 3 mi visibility) and that there was no problem, as we had made the correction for the early descent on the false GS.
Original NASA ASRS Text
Title: AN ACR B737 FLC MAKING AN APCH CAPTURED A FALSE GS AND STARTED AN EARLY, STEEP, DSCNT. THE FLC RECOGNIZED THE PROB AT ABOUT THE SAME TIME THAT THE APCH CTLR CALLED ABOUT A LOW ALT ALERT. THEY RECOVERED AND RETURNED TO THEIR APCH ALT AND INTERCEPTED THE CORRECT GS FOR A SUCCESSFUL APCH AND LNDG. CFTT.
Narrative: ON FLT INTO PIT ARPT ON ILS APCH RWY 28L, WE GOT GS CAPTURE AND I STARTED DSCNT. WE CONFIGURED AND DID THE LNDG CHKLIST. I THEN FELT THAT THE DSCNT AND DME FROM ARPT DID NOT LOOK RIGHT AND ASKED THE OTHER PLT TO BACK ME UP ON THE ILS. AT THAT TIME, THE TWR CALLED AND SAID WE HAD AN ALT ALERT. WE CLBED BACK TO 3000 FT ASAP. WE THEN GOT A VALID GS SIGNAL -- PROCEEDED ON THE APCH AND COMPLETED THE LNDG. NO FURTHER COMMENT WAS MADE BY THE TWR. I THEN CALLED TWR SUPVR UPON ARR AT THE GATE AND HE SAID THAT THE ILS WAS UNMONITORED DURING THE APCH (WE HAD 2 1/2 - 3 MI VISIBILITY) AND THAT THERE WAS NO PROB, AS WE HAD MADE THE CORRECTION FOR THE EARLY DSCNT ON THE FALSE GS.
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.