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A lead mechanic reports he performed an rii inspection of a replaced outboard hydraulic positive control area; but did not use a protractor or other measuring device to check the specific travel degrees of each positive control area actuator separately on a B767-200 aircraft. Several days later; the replaced positive control area was found to be lagging the inboard positive control area at the outboard aileron.
| Attributes | |
| ACN | 943955 |
| Time | |
| Date | 201103 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B767-200 |
| Operating Under FAR Part | Part 125 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Aileron Control System |
| Person 1 | |
| Function | Lead Technician |
| Qualification | Maintenance Avionics Maintenance Airframe Maintenance Powerplant |
| Experience | Maintenance Lead Technician 30 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Published Material / Policy |
Narrative:
After [left outboard] aileron power control actuator (positive control area) replacement; I was requested for rii on the positive control area replaced. The aviation maintenance technician (amt) that replaced the positive control area has done the job before. I checked the installation and leak checked the positive control area during operation. I then had the amt cycle the aileron from stop to stop and checked the travel. I did the travel check from a stand and did not use a protractor or other measuring device per the maintenance manual (M/M) operational check. Seven days later; the ailerons were operated with all three hydraulic systems and the replaced positive control area was lagging. It was found to have internal leakage and had to be replaced. Maybe if the the travel checks were accomplish with the protractor; it may not have made full travel and [would have been] investigated at that time. Causes: bad positive control area part from supply. Did not accomplish operational check per MM; accomplished based on previous experience. Time restraint and trust of the amt.
Original NASA ASRS Text
Title: A Lead Mechanic reports he performed an RII inspection of a replaced outboard hydraulic PCA; but did not use a protractor or other measuring device to check the specific travel degrees of each PCA actuator separately on a B767-200 aircraft. Several days later; the replaced PCA was found to be lagging the inboard PCA at the outboard aileron.
Narrative: After [left outboard] aileron Power Control Actuator (PCA) replacement; I was requested for RII on the PCA replaced. The Aviation Maintenance Technician (AMT) that replaced the PCA has done the job before. I checked the installation and leak checked the PCA during operation. I then had the AMT cycle the aileron from stop to stop and checked the travel. I did the travel check from a stand and did not use a protractor or other measuring device per the Maintenance Manual (M/M) operational check. Seven days later; the ailerons were operated with all three hydraulic systems and the replaced PCA was lagging. It was found to have internal leakage and had to be replaced. Maybe if the the travel checks were accomplish with the protractor; it may not have made full travel and [would have been] investigated at that time. Causes: Bad PCA part from supply. Did not accomplish operational check per MM; accomplished based on previous experience. Time restraint and trust of the AMT.
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.