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2 heading track deviations during IAP ILS approach into lgw. Third approach successful in manual type approach.
| Attributes | |
| ACN | 234437 |
| Time | |
| Date | 199302 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lgw |
| State Reference | FO |
| Altitude | agl bound lower : 1000 agl bound upper : 1500 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : lgw |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | ils localizer & glide slope : lgw Other |
| Flight Phase | descent : approach landing : missed approach |
| Route In Use | approach : straight in enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : instrument pilot : flight engineer |
| Experience | flight time last 90 days : 210 flight time total : 4500 |
| ASRS Report | 234437 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
| Situations | |
| Navigational Aid | Unspecified |
Narrative:
I was the so, flight from iah to lgw. On final approach in london, lgw, the initial localizer capture was normal along with the GS until the aircraft started descending on the GS. Then the localizer became erratic and the GS was normal. Tower advised us we were right of centerline. The first officer disconnected both autoplts in attempt to center the localizer and was unable and we made a missed approach. A second approach was made after checking for good signals from our navaids. This approach was made using autoplt a only. The results were the same, the aircraft flew right of centerline on descent and tower gave us a heading, but unable to continue approach and made a missed approach. A third approach was made by the captain manually to a safe landing without using the autoplt at all.
Original NASA ASRS Text
Title: 2 HDG TRACK DEVS DURING IAP ILS APCH INTO LGW. THIRD APCH SUCCESSFUL IN MANUAL TYPE APCH.
Narrative: I WAS THE SO, FLT FROM IAH TO LGW. ON FINAL APCH IN LONDON, LGW, THE INITIAL LOC CAPTURE WAS NORMAL ALONG WITH THE GS UNTIL THE ACFT STARTED DSNDING ON THE GS. THEN THE LOC BECAME ERRATIC AND THE GS WAS NORMAL. TWR ADVISED US WE WERE R OF CTRLINE. THE FO DISCONNECTED BOTH AUTOPLTS IN ATTEMPT TO CTR THE LOC AND WAS UNABLE AND WE MADE A MISSED APCH. A SECOND APCH WAS MADE AFTER CHKING FOR GOOD SIGNALS FROM OUR NAVAIDS. THIS APCH WAS MADE USING AUTOPLT A ONLY. THE RESULTS WERE THE SAME, THE ACFT FLEW R OF CTRLINE ON DSCNT AND TWR GAVE US A HDG, BUT UNABLE TO CONTINUE APCH AND MADE A MISSED APCH. A THIRD APCH WAS MADE BY THE CAPT MANUALLY TO A SAFE LNDG WITHOUT USING THE AUTOPLT AT ALL.
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.