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An aircraft maintenance technician recommended a specific tool be made or listed in the aircraft maintenance manual for technicians to use to avoid damage to cfm-56 engine fan disks when removing the N1 fan blade shim/keeper weights. Inadvertent tooling damage by technician required unscheduled engine replacement on a B737-900 aircraft.
| Attributes | |
| ACN | 1289750 |
| Time | |
| Date | 201508 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-900 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Fan Disc |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
While trying to remove N1 fan blade per given aircraft maintenance manual (amm); tool marks [were] made on [fan] disk thus requiring unscheduled engine replacement. No exact tooling listed in given amm to remove N1 fan blade shim/keeper weights and using hand to work is not really possible. [Recommend] tool [be] made or listed [in amm] to remove N1 fan blade shim/keeper weights and added to amm 72-21-02 and listed in required tool section. Also; [add maintenance] note: given the importance on not having damage to fan blade disk due to tooling marks.
Original NASA ASRS Text
Title: An Aircraft Maintenance Technician recommended a specific tool be made or listed in the Aircraft Maintenance Manual for technicians to use to avoid damage to CFM-56 Engine Fan disks when removing the N1 Fan Blade Shim/Keeper weights. Inadvertent tooling damage by Technician required unscheduled engine replacement on a B737-900 aircraft.
Narrative: While trying to remove N1 fan blade per given Aircraft Maintenance Manual (AMM); tool marks [were] made on [Fan] disk thus requiring unscheduled engine replacement. No exact tooling listed in given AMM to remove N1 Fan blade shim/keeper weights and using hand to work is not really possible. [Recommend] Tool [be] made or listed [in AMM] to remove N1 Fan blade shim/keeper weights and added to AMM 72-21-02 and listed in required tool section. Also; [add maintenance] NOTE: given the importance on not having damage to Fan blade disk due to tooling marks.
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.