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Egpws alert from an excessive rate of descent in chasing a false GS well outside the FAF in a falcon 900 on approach to bed, ma.
| Attributes | |
| ACN | 541708 |
| Time | |
| Date | 200203 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : lobby |
| State Reference | MA |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Snow |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a90.tracon tower : bed.tower |
| Operator | general aviation : corporate |
| Make Model Name | Falcon 900 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 8500 flight time type : 1000 |
| ASRS Report | 541708 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | atc equipment : msaw aircraft equipment : gpws other controllera |
| Resolutory Action | controller : issued advisory flight crew : returned to original clearance flight crew : overcame equipment problem flight crew : became reoriented |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Inbound to bed from west for ILS runway 11 bed. Clearance: cross lobby at 2000 ft, cleared ILS runway 11. Approaching lobby at 3000 ft, GS pointer came on view showing intercepting GS from below. Crossed lobby and began descent toward transition altitude of 1700 ft MSL and attempted to capture GS showing fly down indication. Approaching 1700 ft MSL, egpws issued terrain warning. Responded to warning by executing immediate climb. During climb maneuver, lost capture on both localizer/GS. Rearmed localizer/GS. Localizer recaptured and GS came into view now indicating fly up. Recaptured GS needle at 3100-3200 ft MSL. At about this point ATC asked for an altitude check and we responded with our altitude and reported erroneous GS indications. We verified agreement between left and right instruments and resumed the approach to an uneventful landing. We observed no conflict with other aircraft during this maneuver and none was reported to us by ATC. Human factors: I intend to place particular emphasis on altitude awareness versus localizer and GS position in my future approach briefings.
Original NASA ASRS Text
Title: EGPWS ALERT FROM AN EXCESSIVE RATE OF DSCNT IN CHASING A FALSE GS WELL OUTSIDE THE FAF IN A FALCON 900 ON APCH TO BED, MA.
Narrative: INBOUND TO BED FROM W FOR ILS RWY 11 BED. CLRNC: CROSS LOBBY AT 2000 FT, CLRED ILS RWY 11. APCHING LOBBY AT 3000 FT, GS POINTER CAME ON VIEW SHOWING INTERCEPTING GS FROM BELOW. CROSSED LOBBY AND BEGAN DSCNT TOWARD TRANSITION ALT OF 1700 FT MSL AND ATTEMPTED TO CAPTURE GS SHOWING FLY DOWN INDICATION. APCHING 1700 FT MSL, EGPWS ISSUED TERRAIN WARNING. RESPONDED TO WARNING BY EXECUTING IMMEDIATE CLB. DURING CLB MANEUVER, LOST CAPTURE ON BOTH LOC/GS. REARMED LOC/GS. LOC RECAPTURED AND GS CAME INTO VIEW NOW INDICATING FLY UP. RECAPTURED GS NEEDLE AT 3100-3200 FT MSL. AT ABOUT THIS POINT ATC ASKED FOR AN ALT CHK AND WE RESPONDED WITH OUR ALT AND RPTED ERRONEOUS GS INDICATIONS. WE VERIFIED AGREEMENT BTWN L AND R INSTS AND RESUMED THE APCH TO AN UNEVENTFUL LNDG. WE OBSERVED NO CONFLICT WITH OTHER ACFT DURING THIS MANEUVER AND NONE WAS RPTED TO US BY ATC. HUMAN FACTORS: I INTEND TO PLACE PARTICULAR EMPHASIS ON ALT AWARENESS VERSUS LOC AND GS POS IN MY FUTURE APCH BRIEFINGS.
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.