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A320 flight crew experiences an unreliable glideslope during an ILS approach to runway 28 at ord. At willt the glideslope returns to normal and a B747 is noted holding short for runway 28 on the south side. The tower indicates that it has happened several times since the new south side access was constructed.
| Attributes | |
| ACN | 936581 |
| Time | |
| Date | 201103 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ORD.Airport |
| State Reference | IL |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Experience | Flight Crew Last 90 Days 450 Flight Crew Total 10000 Flight Crew Type 6000 |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 80 Flight Crew Total 17500 Flight Crew Type 1000 |
| Events | |
| Anomaly | ATC Issue All Types Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
On about 8 mile final the ILS glideslope became [unreliable]. As we continued to fly the glideslope we were actually about 500 to 800 ft low in altitude. At the outer marker; willt; the weather became VMC and noticed we were low. We also noticed that a jumbo jet was making a 90 degree turn to line up on runway 28. This aircraft interfered with the localizer signal. The new holding area on the approach end of runway 28 needs to be looked at. The aircraft that landed ahead of us also complained about a very similar phenomenom on final.
Original NASA ASRS Text
Title: A320 flight crew experiences an unreliable glideslope during an ILS approach to Runway 28 at ORD. At WILLT the glideslope returns to normal and a B747 is noted holding short for Runway 28 on the south side. The Tower indicates that it has happened several times since the new south side access was constructed.
Narrative: On about 8 mile final the ILS Glideslope became [unreliable]. As we continued to fly the glideslope we were actually about 500 to 800 FT low in altitude. At the outer marker; WILLT; the weather became VMC and noticed we were low. We also noticed that a jumbo jet was making a 90 degree turn to line up on Runway 28. This aircraft interfered with the localizer signal. The new holding area on the approach end of Runway 28 needs to be looked at. The aircraft that landed ahead of us also complained about a very similar phenomenom on final.
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.