# SDR UALA2012020600705

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 5, 2012
- Submitted: March 12, 2012
- Operation: Air carrier
- Aircraft: [N221UA](https://openairdocs.org/aircraft/N221UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30552
- Aircraft time: 44,779 hours, 5,605 cycles
- Engine: Pwa PW40903
- System (JASC): [7520 · Engine Cooling System](https://openairdocs.org/jasc/7520)
- Part: Helicoil
- Condition: Damaged
- Location: Tvbc Valve
- 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/UALA2012020600705

## Discrepancy

TWO OF THE 6 HELI-COILS THAT RETAIN THE LT LOWER TVBC VALVE ARE DAMAGED BEYOND USE AND WILL NEED REPLACEMENT.  REPLACED 2 EACH DAMAGED HELI-COIL AT THE LT LOWER TVBC VALVE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.