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A dehavilland dhc-8 #2 engine incurred damage to the high pressure impeller when the low pressure impeller was repaired. Suspect foreign object ingestion.
| Attributes | |
| ACN | 566974 |
| Time | |
| Date | 200211 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8-100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 13 |
| ASRS Report | 566974 |
| Person 2 | |
| Affiliation | company : air carrier |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 13 |
| ASRS Report | 566786 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : repair performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
On nov/thu/02, at XA00 am, I was asked to finish blending an impeller (lp) on aircraft X. I proceeded to finish the job other mechanics started. I continued to blend as per the manual, so the aircraft could make flts for the day. There was damage to the hp impeller, which would only allow for a 10 hour time limited deferred item until engine had to be removed. The aircraft left and flew all day on the nov/thu/02, when I arrived at work on nov/fri/02, I found out the engine had been FOD'ed again since I signed for the area safety check and didn't find anything. However, there were numerous people who did blend before me, I did rechk for all my tools, and have accounted for them. Not sure why that happened or if I missed something on area safety check.
Original NASA ASRS Text
Title: A DEHAVILLAND DHC-8 #2 ENG INCURRED DAMAGE TO THE HIGH PRESSURE IMPELLER WHEN THE LOW PRESSURE IMPELLER WAS REPAIRED. SUSPECT FOREIGN OBJECT INGESTION.
Narrative: ON NOV/THU/02, AT XA00 AM, I WAS ASKED TO FINISH BLENDING AN IMPELLER (LP) ON ACFT X. I PROCEEDED TO FINISH THE JOB OTHER MECHS STARTED. I CONTINUED TO BLEND AS PER THE MANUAL, SO THE ACFT COULD MAKE FLTS FOR THE DAY. THERE WAS DAMAGE TO THE HP IMPELLER, WHICH WOULD ONLY ALLOW FOR A 10 HR TIME LIMITED DEFERRED ITEM UNTIL ENG HAD TO BE REMOVED. THE ACFT LEFT AND FLEW ALL DAY ON THE NOV/THU/02, WHEN I ARRIVED AT WORK ON NOV/FRI/02, I FOUND OUT THE ENG HAD BEEN FOD'ED AGAIN SINCE I SIGNED FOR THE AREA SAFETY CHK AND DIDN'T FIND ANYTHING. HOWEVER, THERE WERE NUMEROUS PEOPLE WHO DID BLEND BEFORE ME, I DID RECHK FOR ALL MY TOOLS, AND HAVE ACCOUNTED FOR THEM. NOT SURE WHY THAT HAPPENED OR IF I MISSED SOMETHING ON AREA SAFETY CHK.
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.