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Technician reported difficulty in locating correct reference for replacing the rudder trim knob.
| Attributes | |
| ACN | 1753522 |
| Time | |
| Date | 202007 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Regional Jet 900 (CRJ900) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Rudder Trim System |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
I was tasked to perform a trend on aircraft X; to replace the rudder trim knob; due to the knob coming loose. I removed old knob and installed the new knob. As I was not able to find a reference to replace the knob; I used task in the amm. Under this reference is sub task which tells of testing the rudder trim system via the knob. At the time; the trim functioned without any noted problems.on take off from ZZZ the aircraft experienced a rudder trim run away event.instead of using amm for a reference for replacing the rudder trim knob; the cmm (component maintenance manual) should be referenced in the amm for knob replacement. Could not find a cmm reference; so I thought there was no reference for this.rudder trim control panel replaced due to event.the amm reference should direct to the cmm for maintenance on the rudder trim panel and it's components; as the cmm was difficult for me to find.
Original NASA ASRS Text
Title: Technician reported difficulty in locating correct reference for replacing the Rudder Trim Knob.
Narrative: I was tasked to perform a trend on Aircraft X; to replace the rudder trim knob; due to the knob coming loose. I removed old knob and installed the new knob. as I was not able to find a reference to replace the knob; I used task in the AMM. Under this reference is sub task which tells of testing the rudder trim system via the knob. At the time; the trim functioned without any noted problems.On take off from ZZZ the aircraft experienced a rudder trim run away event.Instead of using AMM for a reference for replacing the rudder trim knob; the CMM (Component Maintenance Manual) should be referenced in the AMM for knob replacement. Could not find a CMM reference; so I thought there was no reference for this.Rudder Trim Control Panel replaced due to event.The AMM reference should direct to the CMM for maintenance on the rudder trim panel and it's components; as the CMM was difficult for me to find.
Data retrieved from NASA's ASRS site 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.