# SDR ASAA0955713

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 20, 2009
- Submitted: May 22, 2009
- Operation: Air carrier
- Aircraft: [N517AS](https://openairdocs.org/aircraft/N517AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35197
- Aircraft time: 1,337 hours, 404 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 7077
- Condition: Defective
- Location: Ac Bay
- Part time: 21,565 hours, 8,284 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA0955713

## Discrepancy

CONT. CAB ZONE TEMP LIGHT ILLUMINATED. PERFORMED QRH CHECK LIST LIGHT REMAINED ON. LIGHT GOES OUT WITH MASTER CAUTION RESET. FAULT CODE 216 271 00. GROUNDED YES. REMOVED & REPLACED CONTROL CABIN ZONE TEMP TRIM AIR MODULATING VALVE REF MM 21 61 21 400 801.

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