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An A320 captured a false and/or corrupt glideslope signal and descended at an excessive rate causing a flap overspeed. Tower advised a B747 was maneuvering in the vicinity of the glideslope transmitter at the time of the event.
| Attributes | |
| ACN | 930004 |
| Time | |
| Date | 201101 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ORD.Airport |
| State Reference | IL |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Speed All Types Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
At flaps 2 and 180 KTS assigned with autopilot on; the aircraft pitched over to chase erroneous glideslope and accelerated past the 200 KTS limit for flaps 2 by 5 KTS before I could disengage the autopilot. There was no warning from previous aircraft on approach or from controller. I called tower upon landing and the problem had occurred previously but not to the extent our aircraft experienced.I was told that the close proximity of a taxiway to the glideslope antennae with passage of a wide body could cause the problem and a B747 was maneuvering in described area at time of event.
Original NASA ASRS Text
Title: An A320 captured a false and/or corrupt glideslope signal and descended at an excessive rate causing a flap overspeed. Tower advised a B747 was maneuvering in the vicinity of the glideslope transmitter at the time of the event.
Narrative: At flaps 2 and 180 KTS assigned with autopilot on; the aircraft pitched over to chase erroneous glideslope and accelerated past the 200 KTS limit for flaps 2 by 5 KTS before I could disengage the autopilot. There was no warning from previous aircraft on approach or from Controller. I called Tower upon landing and the problem had occurred previously but not to the extent our aircraft experienced.I was told that the close proximity of a taxiway to the glideslope antennae with passage of a wide body could cause the problem and a B747 was maneuvering in described area at time of event.
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.