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On ILS approach air carrier receives large up and down corrections on glide slope. Decided go around, vectored for approach different runway.
| Attributes | |
| ACN | 176465 |
| Time | |
| Date | 199104 |
| Day | Mon |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 3000 msl bound upper : 3500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach descent other landing : go around |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 140 flight time total : 2700 flight time type : 700 |
| ASRS Report | 176465 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 125 flight time total : 6500 flight time type : 125 |
| ASRS Report | 176454 |
| Events | |
| Anomaly | altitude deviation : overshoot inflight encounter other non adherence : clearance non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | Pilot Deviation |
| Situations | |
| Navigational Aid | Unspecified |
Narrative:
On approach into dfw, the controller cleared us for a turn onto the ILS final for 35L. While descending from 4000' to 3000' MSL on final approach, the G/south director began to command large up and down corrections to the G/south. At 2600' sml, in the WX with mod turbulence, the captain and first officer decided to abandon the approach and go around. While being vectored, we were told by approach there was a suspected malfunction with the ILS on 35L and we would be vectored for a landing on runway 36R. Approach and landing were normal, except for a 15-20 KT windshear on final. After landing, dfw operations informed us 4 aircraft had gone around for the same reason.
Original NASA ASRS Text
Title: ON ILS APCH ACR RECEIVES LARGE UP AND DOWN CORRECTIONS ON GLIDE SLOPE. DECIDED GO AROUND, VECTORED FOR APCH DIFFERENT RWY.
Narrative: ON APCH INTO DFW, THE CTLR CLRED US FOR A TURN ONTO THE ILS FINAL FOR 35L. WHILE DSNDING FROM 4000' TO 3000' MSL ON FINAL APCH, THE G/S DIRECTOR BEGAN TO COMMAND LARGE UP AND DOWN CORRECTIONS TO THE G/S. AT 2600' SML, IN THE WX WITH MOD TURB, THE CAPT AND F/O DECIDED TO ABANDON THE APCH AND GO AROUND. WHILE BEING VECTORED, WE WERE TOLD BY APCH THERE WAS A SUSPECTED MALFUNCTION WITH THE ILS ON 35L AND WE WOULD BE VECTORED FOR A LNDG ON RWY 36R. APCH AND LNDG WERE NORMAL, EXCEPT FOR A 15-20 KT WINDSHEAR ON FINAL. AFTER LNDG, DFW OPS INFORMED US 4 ACFT HAD GONE AROUND FOR THE SAME REASON.
Data retrieved from NASA's ASRS site as of July 2007 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.