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A B737-800 captain's HUD and flight instruments locked up during an IMC ILS. A go around was initiated with the first officer flying the aircraft.
| Attributes | |
| ACN | 727815 |
| Time | |
| Date | 200702 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dfw.airport |
| State Reference | TX |
| Altitude | msl single value : 2400 |
| Environment | |
| Weather Elements | Fog Rain other |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 17l |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 727815 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 727536 |
| Events | |
| Anomaly | aircraft equipment problem : critical other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : pfd/hud other flight crewa |
| Resolutory Action | flight crew : executed go around |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On final for runway 17L ILS at roughly 1600 ft RA the 'flight guidance cue' disappeared on the HUD. Xchking down on the pfd steering bar seems slightly left of course; started to decrease rate of descent and asked first officer what he changed. First officer replied nothing. Still no flight guidance cue; noticed no GS on pfd. Initiated go around procedure. First officer mentioned I need to come left; made slight correction left to re-center steering bar. First officer re-stated I needed to come further left; made more of a correction to left. On third comment from first officer thinking I may have false indications from steering bar; xferred control of aircraft to first officer during climb out. On climb out and turning crosswind CDI steering bar was still frozen slightly left of center and would not reset until changing frequency and turning off flight director. First officer commented he did not have any indication on the HUD annunciator panel.
Original NASA ASRS Text
Title: A B737-800 CAPT'S HUD AND FLT INSTRUMENTS LOCKED UP DURING AN IMC ILS. A GAR WAS INITIATED WITH THE FO FLYING THE ACFT.
Narrative: ON FINAL FOR RWY 17L ILS AT ROUGHLY 1600 FT RA THE 'FLT GUIDANCE CUE' DISAPPEARED ON THE HUD. XCHKING DOWN ON THE PFD STEERING BAR SEEMS SLIGHTLY L OF COURSE; STARTED TO DECREASE RATE OF DSCNT AND ASKED FO WHAT HE CHANGED. FO REPLIED NOTHING. STILL NO FLT GUIDANCE CUE; NOTICED NO GS ON PFD. INITIATED GAR PROC. FO MENTIONED I NEED TO COME L; MADE SLIGHT CORRECTION L TO RE-CTR STEERING BAR. FO RE-STATED I NEEDED TO COME FURTHER L; MADE MORE OF A CORRECTION TO L. ON THIRD COMMENT FROM FO THINKING I MAY HAVE FALSE INDICATIONS FROM STEERING BAR; XFERRED CTL OF ACFT TO FO DURING CLBOUT. ON CLBOUT AND TURNING XWIND CDI STEERING BAR WAS STILL FROZEN SLIGHTLY L OF CTR AND WOULD NOT RESET UNTIL CHANGING FREQ AND TURNING OFF FLT DIRECTOR. FO COMMENTED HE DID NOT HAVE ANY INDICATION ON THE HUD ANNUNCIATOR PANEL.
Data retrieved from NASA's ASRS site as of January 2009 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.