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An air carrier pilot flying an IMC avl runway 34 ILS reported a glide slope pitch up followed by a pitch down. The aircraft aggressively followed the ILS signal causing the crew to disconnect the autopilot and hand fly the aircraft to landing. The approach continued VMC but with a fluctuating glide slope signal.
| Attributes | |
| ACN | 872643 |
| Time | |
| Date | 201002 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | AVL.Airport |
| State Reference | NC |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Regional Jet 200 ER/LR (CRJ200) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Commercial |
| Events | |
| Anomaly | ATC Issue All Types Inflight Event / Encounter Other / Unknown |
Narrative:
While on vectors to an avl ILS runway 34 we were given heading to intercept the localizer and cleared for the approach. The autopilot and flight director were engaged and the approach was followed per company profile. The glideslope was erratic and caused the flight director to capture too early and the airplane climbed 200 ft and then it nosed down approximately 5 degrees and entered a 2000 ft per minute descent. It was clear that the glideslope could not be followed and the autopilot was disconnected. Even when hand flying the glideslope could not be followed. We asked tower and they said that it has had reported problems for 2 years and the FAA has flight tested the equipment and it was in tolerance. This glideslope does have a NOTAM runway 34 coupled ILS approaches below 2960 not authorized. Wie until ufn. Created: 04 feb 19:58 2010. The glideslope was not usable while we were above 2960 and the glideslope was not usable while hand flying under 2960. Minor deviations were noted even when the aircraft maintained a constant descent. I don't believe the ILS should be used in IMC or at night. This should be a visual or localizer approach only.
Original NASA ASRS Text
Title: An Air Carrier pilot flying an IMC AVL Runway 34 ILS reported a glide slope pitch up followed by a pitch down. The aircraft aggressively followed the ILS signal causing the crew to disconnect the autopilot and hand fly the aircraft to landing. The approach continued VMC but with a fluctuating glide slope signal.
Narrative: While on vectors to an AVL ILS Runway 34 we were given heading to intercept the localizer and cleared for the approach. The autopilot and flight director were engaged and the approach was followed per company profile. The glideslope was erratic and caused the flight director to capture too early and the airplane climbed 200 FT and then it nosed down approximately 5 degrees and entered a 2000 FT per minute descent. It was clear that the glideslope could not be followed and the autopilot was disconnected. Even when hand flying the glideslope could not be followed. We asked Tower and they said that it has had reported problems for 2 years and the FAA has flight tested the equipment and it was in tolerance. This glideslope does have a NOTAM Runway 34 COUPLED ILS APPROACHES BELOW 2960 NOT AUTHORIZED. WIE UNTIL UFN. CREATED: 04 FEB 19:58 2010. The glideslope was not usable while we were above 2960 and the glideslope was not usable while hand flying under 2960. Minor deviations were noted even when the aircraft maintained a constant descent. I don't believe the ILS should be used in IMC or at night. This should be a visual or LOC approach only.
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.