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A B727 flight crew reports an unreliable GS signal as the reason for receiving a low altitude warning by tower controller during an ILS approach to runway 3R at dtw, mi.
| Attributes | |
| ACN | 474660 |
| Time | |
| Date | 200005 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dtw.airport |
| State Reference | MI |
| Altitude | msl bound lower : 2000 msl bound upper : 2700 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : dtw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 03r other vortac |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 40 flight time total : 3400 flight time type : 20 |
| ASRS Report | 474660 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 12000 flight time type : 7000 |
| ASRS Report | 473343 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : overshoot inflight encounter : weather non adherence : clearance non adherence : company policies non adherence : far non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | atc equipment : msaw other controllera |
| Resolutory Action | flight crew : executed missed approach |
| Consequence | Other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On ILS approach to runway 3R at dtw, had problems acquiring the GS inside crl VOR. Once acquired, got a low altitude warning from the tower. Initiated a go around, came back for another approach. Unreliable GS indications on first officer side again. Captain flew the approach to uneventful landing. Good identify on localizer signal, no flags.
Original NASA ASRS Text
Title: A B727 FLC RPTS AN UNRELIABLE GS SIGNAL AS THE REASON FOR RECEIVING A LOW ALT WARNING BY TWR CTLR DURING AN ILS APCH TO RWY 3R AT DTW, MI.
Narrative: ON ILS APCH TO RWY 3R AT DTW, HAD PROBS ACQUIRING THE GS INSIDE CRL VOR. ONCE ACQUIRED, GOT A LOW ALT WARNING FROM THE TWR. INITIATED A GAR, CAME BACK FOR ANOTHER APCH. UNRELIABLE GS INDICATIONS ON FO SIDE AGAIN. CAPT FLEW THE APCH TO UNEVENTFUL LNDG. GOOD IDENT ON LOC SIGNAL, NO FLAGS.
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.