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A B737-300 on vector to ILS at 3000 ft has autoplt disconnect and flight director bias out of view. Aircraft flown manually to normal landing.
| Attributes | |
| ACN | 492040 |
| Time | |
| Date | 200011 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : iah.airport |
| State Reference | TX |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : i90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 26 other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 40 flight time total : 7000 flight time type : 1000 |
| ASRS Report | 492040 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : a/p discounnect warning other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem flight crew : overrode automation |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
On vector to ILS runway 26 at iah, mode control panel froze with all '8's' showing in boxes. Autoplt kicked off, flight director disappeared and heading bug froze in different position (between captain and first officer). Aircraft control was taken over manually but aircraft went through localizer. When correction was made, ATC advised we went through localizer turn right to intercept. All was accomplished as quickly as possible, normal landing was made visually. Try not to rely on flight director as much, but it is our normal mode of operation.
Original NASA ASRS Text
Title: A B737-300 ON VECTOR TO ILS AT 3000 FT HAS AUTOPLT DISCONNECT AND FLT DIRECTOR BIAS OUT OF VIEW. ACFT FLOWN MANUALLY TO NORMAL LNDG.
Narrative: ON VECTOR TO ILS RWY 26 AT IAH, MODE CTL PANEL FROZE WITH ALL '8'S' SHOWING IN BOXES. AUTOPLT KICKED OFF, FLT DIRECTOR DISAPPEARED AND HEADING BUG FROZE IN DIFFERENT POS (BTWN CAPT AND FO). ACFT CTL WAS TAKEN OVER MANUALLY BUT ACFT WENT THROUGH LOC. WHEN CORRECTION WAS MADE, ATC ADVISED WE WENT THROUGH LOC TURN R TO INTERCEPT. ALL WAS ACCOMPLISHED AS QUICKLY AS POSSIBLE, NORMAL LNDG WAS MADE VISUALLY. TRY NOT TO RELY ON FLT DIRECTOR AS MUCH, BUT IT IS OUR NORMAL MODE OF OP.
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.