# SDR QMLA2017121917139

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 20, 2017
- Submitted: December 20, 2017
- Operation: Air carrier
- Aircraft: [N200HN](https://openairdocs.org/aircraft/N200HN), registered now
- Make and model: Urocop EC135T2
- Registry model: [Urocop EC135T2](https://openairdocs.org/model/eurocopter-deutschland-ec135t2) (OpenAirDocs)
- Aircraft serial: 0444
- Aircraft time: 4,898 hours, 15,286 cycles
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Transmission
- Part number: 4649010006
- Part serial: 312
- Condition: Making Metal
- Location: Main Rotor
- Part time: 7,562 hours, 5,886 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QMLA2017121917139

## Discrepancy

TWO MAIN TRANSMISSION CHIP INDICATIONS 35 HOURS APART REQUIRING PINION AND BEVEL GEAR INSPECION PER AIRBUS ASB EC135-63A-012. FOUND PITTING ON #1 BEVEL GEAR THAT WAS BEYOND LIMITS. THIS AIRCRAFT REMAINS OUT OF SERVICE AT THE TIME OF THIS SUBMISSION AWAITING A REPLACEMENT MAIN TRANSMISSION TO ARRIVE.

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