# SDR 20010420CW014

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 23, 2001
- Submitted: April 20, 2001
- Operation: Air carrier
- Aircraft: [N417AL](https://openairdocs.org/aircraft/N417AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53054
- Engine: Allsn 250C47B
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Bearing
- Part number: 407340339103
- Part serial: F992023
- Condition: Damaged
- Location: T/R Driveshaft
- Part time: 5,418 hours
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20010420CW014

## Discrepancy

ON THE 2ND SHUT DOWN OF THE DAY, LOUD NOISES AND EXCESSIVE VIBRATION WERE NOTED.  FORWARD BEARING ON THE NR 2 TAILROTOR DRIVESHAFT, (OIL COOLER BLOWER) HAD AN UNCONTAINED FAILURE.  BLOWER DECK AND SUPPORTING STRUCTURE CRACKED AFT ENGINE FIREWALL AND IMPELLER HOUSING.

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