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A mechanic reports a raven R-44 helicopter MM was unclear and did not specifically require spacers to be installed after excess play discrepancy at the main rotor swash plate had been removed.
| Attributes | |
| ACN | 920852 |
| Time | |
| Date | 201011 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Robinson R44 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Main Rotor Hub |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant Maintenance Inspection Authority |
| Experience | Maintenance Technician 4 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance |
Narrative:
Before performing a 100-hour inspection; it was brought to my attention that some bolts and bushings were worn on a mai rotor swash plate. This was causing excess play in the swash plate. The parts had previously been ordered by another individual and I replaced the two bolts and four bushings. When I removed the bolts and bushings; I found no spacers installed. I did not install spacers when I installed the new bolts and bushings. I performed the measurements and found that I had the gaps required by the maintenance manual (MM) and it reduced the amount of play in the swash plate to within acceptable limits of the MM.I was [later] informed [by] the operator; that the play in the swash plate was back; and that the bolt had worn about 1/4' inch through. The operator first said that it was over-torqued. I responded by informing them that I used the torque in the MM. Then the operator informed me that it is required to have a spacer per the manufacturer; regardless of whether it measures within tolerance.
Original NASA ASRS Text
Title: A Mechanic reports a Raven R-44 helicopter MM was unclear and did not specifically require spacers to be installed after excess play discrepancy at the main rotor swash plate had been removed.
Narrative: Before performing a 100-hour Inspection; it was brought to my attention that some bolts and bushings were worn on a Mai rotor swash plate. This was causing excess play in the swash plate. The parts had previously been ordered by another individual and I replaced the two bolts and four bushings. When I removed the bolts and bushings; I found no spacers installed. I did not install spacers when I installed the new bolts and bushings. I performed the measurements and found that I had the gaps required by the Maintenance Manual (MM) and it reduced the amount of play in the swash plate to within acceptable limits of the MM.I was [later] informed [by] the Operator; that the play in the swash plate was back; and that the bolt had worn about 1/4' inch through. The Operator first said that it was over-torqued. I responded by informing them that I used the torque in the MM. Then the Operator informed me that it is required to have a spacer per the manufacturer; regardless of whether it measures within tolerance.
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.