# SDR UALA2011030201019

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 28, 2011
- Submitted: March 17, 2011
- Operation: Air carrier
- Aircraft: [N779UA](https://openairdocs.org/aircraft/N779UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26941
- Aircraft time: 59,651 hours, 10,779 cycles
- Engine: Pwa PW4077
- System (JASC): [2720 · Rudder Control System](https://openairdocs.org/jasc/2720)
- Part: Switch
- Condition: Faulty
- Location: Thrust Asym
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011030201019

## Discrepancy

LOSS OF THRUST ASYMMETRY COMPENSATION (TAC) FUNCTION.  STATUS  MSG01- LATCHED CLIMB MODE DEPENDENT; THRUST ASYM COMP SWITCH IS INVALID. DB- PRIMARY FLIGHT COMPUTER (LEFT) ITEM CNX PER PLF SHOWS NOT ACTIVE  MSG-2710807 LATCHED CL MODE. REPLACED THRUST ASYM COMP SWITCH. MESSAGE CLEARED.

---
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.