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B737-800 crew had an aborted takeoff with airspeed failure. The air data, inertial reference unit was malfunctioning.
| Attributes | |
| ACN | 582906 |
| Time | |
| Date | 200305 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mia.airport |
| State Reference | FL |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 582906 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : master caution ias disagree other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : rejected takeoff none taken : detected after the fact |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Aborted takeoff due to IAS disagree, master caution, engine annunciation, both eec to alternate. Failure traced to #2 adiru (air data, inertial reference unit) as cause for all indications. Deadheading captain informed me he had identical failure recently and I discussed event that evening with a company check airman who has experienced 2 failures of the same type, one within 1 week of this event. There appears to be a trend developing that needs to be looked at. Had this occurred after liftoff, we would have had to deal with unreliable airspeed and engine indications in IMC and with severe WX in the vicinity of mia.
Original NASA ASRS Text
Title: B737-800 CREW HAD AN ABORTED TKOF WITH AIRSPD FAILURE. THE AIR DATA, INERTIAL REF UNIT WAS MALFUNCTIONING.
Narrative: ABORTED TKOF DUE TO IAS DISAGREE, MASTER CAUTION, ENG ANNUNCIATION, BOTH EEC TO ALTERNATE. FAILURE TRACED TO #2 ADIRU (AIR DATA, INERTIAL REF UNIT) AS CAUSE FOR ALL INDICATIONS. DEADHEADING CAPT INFORMED ME HE HAD IDENTICAL FAILURE RECENTLY AND I DISCUSSED EVENT THAT EVENING WITH A COMPANY CHK AIRMAN WHO HAS EXPERIENCED 2 FAILURES OF THE SAME TYPE, ONE WITHIN 1 WK OF THIS EVENT. THERE APPEARS TO BE A TREND DEVELOPING THAT NEEDS TO BE LOOKED AT. HAD THIS OCCURRED AFTER LIFTOFF, WE WOULD HAVE HAD TO DEAL WITH UNRELIABLE AIRSPD AND ENG INDICATIONS IN IMC AND WITH SEVERE WX IN THE VICINITY OF MIA.
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.