# SDR KBTR2019012800002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 18, 2018
- Submitted: January 28, 2019
- Operation: Air carrier
- Aircraft: [N889MT](https://openairdocs.org/aircraft/N889MT), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 54631
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Bracket
- Part number: D02962
- Condition: Cracked
- Location: Zone 200
- Part time: 1,199 hours
- Component: Rotor Brake Cal, Bell
- Component part number: 427340352113
- 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/KBTR2019012800002

## Discrepancy

DURING 3600 HOUR OVERHAUL FOUND BRAKE CALIPER MOUNTING BRACKET CRACKED, STARING AT LOWER CENTER CORNER EXTENDING AROUND BOLT HOLE ON BOTH SIDES. NO OBVIOUS SIGNS OF WHAT STRESSES CAUSED THE CRACK, NOR ANY INDICATION OF AN INDECENT.

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