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MD11 engine compressor discs were damaged in an engine shop cleaning procedure when untrained technicians used unapproved cleaning methods.
| Attributes | |
| ACN | 477514 |
| Time | |
| Date | 200006 |
| Day | Tue |
| 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 | |
| Controlling Facilities | tower : top.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 477514 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : repairman |
| ASRS Report | 477445 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 969 |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : work cards contributing factor : schedule pressure performance deficiency : unqualified personnel performance deficiency : training performance deficiency : non compliance with legal requirements performance deficiency : repair |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Company |
| Primary Problem | Company |
Narrative:
Unknown quantity of CF6-50-80A-80c2-6 rotating parts damaged by improper cleaning methods. Example: disc xyz a C F6-6 hpt stg 2 disk shop order task line XXX was signed off as being wet vapor blast per standard practice manual when in fact it was blasted with 120 dry grit which is not authority/authorized by any manual. This has happened on numerous other parts also.
Original NASA ASRS Text
Title: MD11 ENG COMPRESSOR DISCS WERE DAMAGED IN AN ENG SHOP CLEANING PROC WHEN UNTRAINED TECHNICIANS USED UNAPPROVED CLEANING METHODS.
Narrative: UNKNOWN QUANTITY OF CF6-50-80A-80C2-6 ROTATING PARTS DAMAGED BY IMPROPER CLEANING METHODS. EXAMPLE: DISC XYZ A C F6-6 HPT STG 2 DISK SHOP ORDER TASK LINE XXX WAS SIGNED OFF AS BEING WET VAPOR BLAST PER STANDARD PRACTICE MANUAL WHEN IN FACT IT WAS BLASTED WITH 120 DRY GRIT WHICH IS NOT AUTH BY ANY MANUAL. THIS HAS HAPPENED ON NUMEROUS OTHER PARTS ALSO.
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.