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Flight crew of an large transport air carrier aircraft inadvertently descended below the GS during an ILS approach due to a false GS indicator.
| Attributes | |
| ACN | 255965 |
| Time | |
| Date | 199310 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lga |
| State Reference | NY |
| Altitude | msl bound lower : 2000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : commercial pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 13000 flight time type : 10000 |
| ASRS Report | 255965 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
While on instrument approach to runway 4, I was tuned to lga VOR for DME information, captain was flying and was tuned to ILS. Both radios had good idents. We had intercepted the localizer and captain was following the GS. He asked me the DME and I told him 13 mi. He stopped descending because he was at 2000 ft and knew the altitude was too low for the distance from the runway. He leveled off, recycled the radio frequency and flight control system and continued the approach successfully. No low altitude warning was given by approach control.
Original NASA ASRS Text
Title: FLC OF AN LGT ACR ACFT INADVERTENTLY DSNDED BELOW THE GS DURING AN ILS APCH DUE TO A FALSE GS INDICATOR.
Narrative: WHILE ON INST APCH TO RWY 4, I WAS TUNED TO LGA VOR FOR DME INFO, CAPT WAS FLYING AND WAS TUNED TO ILS. BOTH RADIOS HAD GOOD IDENTS. WE HAD INTERCEPTED THE LOC AND CAPT WAS FOLLOWING THE GS. HE ASKED ME THE DME AND I TOLD HIM 13 MI. HE STOPPED DSNDING BECAUSE HE WAS AT 2000 FT AND KNEW THE ALT WAS TOO LOW FOR THE DISTANCE FROM THE RWY. HE LEVELED OFF, RECYCLED THE RADIO FREQ AND FLT CTL SYS AND CONTINUED THE APCH SUCCESSFULLY. NO LOW ALT WARNING WAS GIVEN BY APCH CTL.
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.