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Just as they broke out of the overcast; the flight crew of an A320 received glide slope warning and an ATC generated low altitude alert due to a heavy jet taxiing through the ILS glideslope transmitter signal. The flight continued to an uneventful landing.
| Attributes | |
| ACN | 871896 |
| Time | |
| Date | 201002 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ORD.Airport |
| State Reference | IL |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | GPWS |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 14000 Flight Crew Type 6420 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 10500 Flight Crew Type 6500 |
| Events | |
| Anomaly | ATC Issue All Types Aircraft Equipment Problem Less Severe Inflight Event / Encounter CFTT / CFIT |
Narrative:
We were established normally; on profile; and cleared for the ILS runway 28 approach at ord. Inside the final approach fix the glide-slope appeared to become intermittently erratic. We subsequently received a low altitude alert from the control tower; along with a glide-slope alert at approximately 1;000 ft AGL. At this point we had the runway environment in sight and continued to an uneventful landing. The control tower indicated that a heavy aircraft had been taxiing past the ILS transmitters.
Original NASA ASRS Text
Title: Just as they broke out of the overcast; the flight crew of an A320 received glide slope warning and an ATC generated low altitude alert due to a heavy jet taxiing through the ILS glideslope transmitter signal. The flight continued to an uneventful landing.
Narrative: We were established normally; on profile; and cleared for the ILS Runway 28 approach at ORD. Inside the final approach fix the glide-slope appeared to become intermittently erratic. We subsequently received a low altitude alert from the Control Tower; along with a glide-slope alert at approximately 1;000 FT AGL. At this point we had the runway environment in sight and continued to an uneventful landing. The Control Tower indicated that a heavy aircraft had been taxiing past the ILS transmitters.
Data retrieved from NASA's ASRS site as of April 2012 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.