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B737-700 flight crew reported executing a go-around on approach to rdu after experiencing a glide slope anomaly.
| Attributes | |
| ACN | 1459084 |
| Time | |
| Date | 201706 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | RDU.Airport |
| State Reference | NC |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | ILS/VOR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 393 Flight Crew Type 2500 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Aircraft Equipment Problem Less Severe |
Narrative:
As we were being vectored for landing on 05R; the controller kept us high (rdu had switched runways from 23L to 05R). While tracking the 05R localizer; we were about to capture the 05R glideslope from above at approximately 6.5 to 7 miles from the runway and suddenly the glideslope needle jumped full scale up to the 'top of the case'. This gave the illusion of the aircraft suddenly diving for the ground. I immediately pulled up and abandoned the approach. The controller vectored us back around for another approach for 05R. The subsequent approach and landing was uneventful.this is the second time in as many months that I have experienced this glideslope anomaly. The last one was in mke at night. This glideslope anomaly is something that has just started happening. In over 43 years of flying; with many thousands of IMC approaches; this has never been a problem until now.
Original NASA ASRS Text
Title: B737-700 flight crew reported executing a go-around on approach to RDU after experiencing a glide slope anomaly.
Narrative: As we were being vectored for landing on 05R; the Controller kept us high (RDU had switched runways from 23L to 05R). While tracking the 05R LOC; we were about to capture the 05R glideslope from above at approximately 6.5 to 7 miles from the runway and suddenly the glideslope needle jumped full scale up to the 'top of the case'. This gave the illusion of the aircraft suddenly diving for the ground. I immediately pulled up and abandoned the approach. The Controller vectored us back around for another approach for 05R. The subsequent approach and landing was uneventful.This is the second time in as many months that I have experienced this glideslope anomaly. The last one was in MKE at night. This glideslope anomaly is something that has just started happening. In over 43 years of flying; with many thousands of IMC approaches; this has never been a problem until now.
Data retrieved from NASA's ASRS site 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.