# SDR CALA2013092591452

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 24, 2013
- Submitted: September 27, 2013
- Operation: Air carrier
- Aircraft: [N218UA](https://openairdocs.org/aircraft/N218UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30222
- Aircraft time: 53,224 hours, 6,454 cycles
- Engine: Pwa PW40903
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Switch
- Condition: Faulty
- Location: Cargo Heat
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2013092591452

## Discrepancy

AFT CARGO HEAT VALVE. DUE TO SEVERAL REPEATS FOR AFT CARGO HEAT TEMPERATURE CONTROL.  THIS HAS NOW BECOME A LEVEL 2 CHRONIC.  REPLACED AFT CARGO OVER HEAT SWITCH IAW AMM21-44-10 MAT TESTED PASSED.

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