What was found
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.
- Difficulty date
- February 5, 2012
- Submitted
- March 12, 2012
- Operation
- Air carrier
- Aircraft
- N221UA
- 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
- Part
- Helicoil
- Condition
- Damaged
- Location
- Tvbc Valve
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.