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While on approach at 5000 to orl, both navigation computers lost memory and HSI went black. Reprogrammed on ground at orl. Normal afterwards.
| Attributes | |
| ACN | 103355 |
| Time | |
| Date | 198901 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : orl |
| State Reference | FO |
| Altitude | msl bound lower : 5000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : orl |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 26000 flight time type : 1000 |
| ASRS Report | 103355 |
| Person 2 | |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Prior to intercepting final approach, the first officer's HSI (pictorial navigation display) went black. The captain's was rendered useless. Both navigation computers lost all memory. No on board cause could be found. After landing IRS's were re-aligned and operated normally on subsequent flts. I suspect a power surge from electronic plant to be the cause.
Original NASA ASRS Text
Title: WHILE ON APCH AT 5000 TO ORL, BOTH NAVIGATION COMPUTERS LOST MEMORY AND HSI WENT BLACK. REPROGRAMMED ON GND AT ORL. NORMAL AFTERWARDS.
Narrative: PRIOR TO INTERCEPTING FINAL APCH, THE F/O'S HSI (PICTORIAL NAV DISPLAY) WENT BLACK. THE CAPT'S WAS RENDERED USELESS. BOTH NAV COMPUTERS LOST ALL MEMORY. NO ON BOARD CAUSE COULD BE FOUND. AFTER LNDG IRS'S WERE RE-ALIGNED AND OPERATED NORMALLY ON SUBSEQUENT FLTS. I SUSPECT A POWER SURGE FROM ELECTRONIC PLANT TO BE THE CAUSE.
Data retrieved from NASA's ASRS site as of August 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.