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A powerplant inspector reports that during a routine teardown process of a pw-4000; inspection discovered two areas of obvious tooling damage that included a crack on the inside face of a high pressure compressor rear shaft. The highly critical rotating shaft was allegedly operating with a crack for several years.
| Attributes | |
| ACN | 863716 |
| Time | |
| Date | 200912 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | No Aircraft |
| Component | |
| Aircraft Component | Compressor Shaft |
| Person 1 | |
| Function | Inspector |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Experience | Maintenance Technician 22 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
During routine down cycle process; inspection discovered obvious tooling damage on high pressure compressor rear shaft that was also cracked. Damage impressions on shaft part; match with high pressure turbine module installation tool. That tool is used to pull the high pressure turbine (hpt) to the core by engaging 2 feet on that area of the shaft during hpt module installation. Engineering said the part will be scrapped. This highly critical rotating part was flying around with a crack for several years.
Original NASA ASRS Text
Title: A Powerplant Inspector reports that during a routine teardown process of a PW-4000; Inspection discovered two areas of obvious tooling damage that included a crack on the inside face of a high pressure compressor rear shaft. The highly critical rotating shaft was allegedly operating with a crack for several years.
Narrative: During routine down cycle process; Inspection discovered obvious tooling damage on high pressure compressor rear shaft that was also cracked. Damage impressions on shaft part; match with high pressure turbine module installation tool. That tool is used to pull the high pressure turbine (HPT) to the core by engaging 2 feet on that area of the shaft during HPT module installation. Engineering said the part will be scrapped. This highly critical rotating part was flying around with a crack for several years.
Data retrieved from NASA's ASRS site as of April 2012 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.