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An A300 pilot report on #2 fadec fault was improperly worked. Bite testing of the hydromechanical unit was not accomplished. Unit later was replaced.
| Attributes | |
| ACN | 663035 |
| Time | |
| Date | 200506 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 25 |
| ASRS Report | 663035 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : built in test unit other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : manuals performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Chart Or Publication Aircraft Environmental Factor Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
A300 arrived with pilot write-up for fadec fault 2 at rollout when reversers deployed. I tested and visually inspected #2 reverser; found no faults. I accomplished a fadec test which showed no current faults; then an fadec bite for fault history. I saw only fault codes for non-significant faults. I missed the code for a significant fault on the hydromechanical unit. On the next flight; the same fault repeated and the hydromechanical unit was replaced. There were no engine performance ramifications; just a repeat of the 'fadec fault 2' on rollout. In cases like this; we have more time after the airplanes leave to go back and more thoroughly read the maintenance and troubleshooting manuals. We are under a lot of pressure to get the airplanes ready (usually 2 or 3 airplanes in 2 1/2 - 3 hours). It's easy to get rushed and overlook something!
Original NASA ASRS Text
Title: AN A300 PLT RPT ON #2 FADEC FAULT WAS IMPROPERLY WORKED. BITE TESTING OF THE HYDROMECHANICAL UNIT WAS NOT ACCOMPLISHED. UNIT LATER WAS REPLACED.
Narrative: A300 ARRIVED WITH PLT WRITE-UP FOR FADEC FAULT 2 AT ROLLOUT WHEN REVERSERS DEPLOYED. I TESTED AND VISUALLY INSPECTED #2 REVERSER; FOUND NO FAULTS. I ACCOMPLISHED A FADEC TEST WHICH SHOWED NO CURRENT FAULTS; THEN AN FADEC BITE FOR FAULT HISTORY. I SAW ONLY FAULT CODES FOR NON-SIGNIFICANT FAULTS. I MISSED THE CODE FOR A SIGNIFICANT FAULT ON THE HYDROMECHANICAL UNIT. ON THE NEXT FLT; THE SAME FAULT REPEATED AND THE HYDROMECHANICAL UNIT WAS REPLACED. THERE WERE NO ENG PERFORMANCE RAMIFICATIONS; JUST A REPEAT OF THE 'FADEC FAULT 2' ON ROLLOUT. IN CASES LIKE THIS; WE HAVE MORE TIME AFTER THE AIRPLANES LEAVE TO GO BACK AND MORE THOROUGHLY READ THE MAINT AND TROUBLESHOOTING MANUALS. WE ARE UNDER A LOT OF PRESSURE TO GET THE AIRPLANES READY (USUALLY 2 OR 3 AIRPLANES IN 2 1/2 - 3 HRS). IT'S EASY TO GET RUSHED AND OVERLOOK SOMETHING!
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.