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An aircraft maintenance technician (amt) reports he mistakenly changed the high pressure 10th stage solenoid (4013ks) instead of the high pressure (hp) 10th stage bleed valve closure solenoid (4029ks) on an A320 aircraft engine. Distraction with helping another mechanic and confusion with the drawings in the aircraft maintenance manual (amm) and troubleshooting manual (tsm) were noted as contributors.
| Attributes | |
| ACN | 1124089 |
| Time | |
| Date | 201310 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Compressor Bleed Valve |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
I was assigned to work an MEL on an A320 aircraft and I was supposed to change the high pressure (hp) 10th stage bleed valve closure solenoid (4029ks). Instead I changed the hp 10th stage solenoid (4023ks); not realizing I changed the wrong solenoid because the terminology confused me. See aircraft maintenance manual (amm) figures [drawings] in chapters 75-23-53 and troubleshooting manual (tsm) 36-11-00. I was working at night; outside on pad-5 on my third night. At the same time; I was assisting a mechanic working a 2.5 bleed actuator on the opposite motor and may have been distracted. I had changed the wrong part and re-deferred the MEL. Two nights later; another mechanic was assigned the same job to fix the MEL; but could not locate the part in stock that I had installed incorrectly. After researching; that mechanic found the part installed in the incorrect position. Distraction and confusion between amm figures in 75-32-53 and tsm 36-11-00; the MEL was cleared during the second visit.
Original NASA ASRS Text
Title: An Aircraft Maintenance Technician (AMT) reports he mistakenly changed the High Pressure 10th stage solenoid (4013ks) instead of the High Pressure (HP) 10th stage bleed valve closure solenoid (4029ks) on an A320 aircraft engine. Distraction with helping another Mechanic and confusion with the drawings in the Aircraft Maintenance Manual (AMM) and Troubleshooting Manual (TSM) were noted as contributors.
Narrative: I was assigned to work an MEL on an A320 aircraft and I was supposed to change the High Pressure (HP) 10th stage bleed valve closure solenoid (4029ks). Instead I changed the HP 10th stage solenoid (4023ks); not realizing I changed the wrong solenoid because the terminology confused me. See Aircraft Maintenance Manual (AMM) figures [drawings] in Chapters 75-23-53 and Troubleshooting Manual (TSM) 36-11-00. I was working at night; outside on Pad-5 on my third night. At the same time; I was assisting a Mechanic working a 2.5 bleed actuator on the opposite motor and may have been distracted. I had changed the wrong part and re-deferred the MEL. Two nights later; another Mechanic was assigned the same job to fix the MEL; but could not locate the part in stock that I had installed incorrectly. After researching; that Mechanic found the part installed in the incorrect position. Distraction and confusion between AMM figures in 75-32-53 and TSM 36-11-00; the MEL was cleared during the second visit.
Data retrieved from NASA's ASRS site as of July 2013 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.