# SDR ASAA2018060624887

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 2, 2018
- Submitted: June 7, 2018
- Operation: Air carrier
- Aircraft: [N516AS](https://openairdocs.org/aircraft/N516AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39044
- Aircraft time: 36,221 hours, 11,004 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989083
- Part serial: 3514
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 64,271 hours, 28,539 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018060624887

## Discrepancy

ON RECALL, THE CONTROL CABIN ZONE TEMP ILLUMINATED,  EXTINGUISHED ON RESET.  ACFT GROUNDED.  REMOVED & REPLACED THE ZONE TRIM MODULATION VALVE IAW AMM 21-61-21-000/400.  CHECKED GOOD IAW AMM 21-51-00-700-803, PACK ZONE TEMP CONTROLLER BITE TEST. OPS NORMAL.

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