# SDR QMLA2021112420061

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 24, 2021
- Submitted: November 24, 2021
- Operation: Air carrier
- Aircraft: [N911EF](https://openairdocs.org/aircraft/N911EF), registered now
- Make and model: Urocop EC 135 P2
- Registry model: [Urocop EC 135 P2](https://openairdocs.org/model/eurocopter-deutschland-ec-135-p2) (OpenAirDocs)
- Aircraft serial: 0497
- Aircraft time: 4,607 hours, 17,432 cycles
- System (JASC): [6210 · Main Rotor Blades](https://openairdocs.org/jasc/6210)
- Part: Blade
- Part number: L621M1010056
- Part serial: 890
- Condition: Out Of Balance
- Location: Main Rotor
- Part time: 6,312 hours, 10,009 cycles
- Stage of operation: IN
- How discovered: B
- Nature of condition: E
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QMLA2021112420061

## Discrepancy

AIRCRAFT CONTINUED TO HAVE TRACK AND BALANCE ISSUES FOR PRIOR 2 MONTHS. EACH TIME THE TRACK AND BALANCE COULD BE ALLEVIATED BUT THE AIRCRAFT CAME BACK NOW IN ITS WORST ITERATION, READING .7 IPS VERTICAL AND .7 LATERAL. I MADE A LARGE ADJUSTMENT ON BLUE AND RECEIVED .1 INPUT DIFFERENCE. THESE TWO CHARACTERISTICS BROUGHT SUSPICION OF A GREATER PROBLEM WHICH I THEN MOVED ALL BLADES IN A FLAPPING MOTION AND FOUND BLUE MAKES A "CRACKLING" SOUND INTERNALLY WHILE THE OTHERS DO NOT. WE REMOVED YELLOW AND BLUE, (BEING OPPOSITE BLADES) AND FOUND WHAT APPEARS TO BE A CRACK BUT WITHOUT ANY WAY TO TEST BESIDE A GVI, WE'LL BE REPLACING S/N 890 ANYWAYS. THIS BLADE SHOULD BE SENT FOR FURTHER ANALYSIS.

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