# SDR ASAA2019080953337

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 5, 2019
- Submitted: August 9, 2019
- Operation: Air carrier
- Aircraft: [N566AS](https://openairdocs.org/aircraft/N566AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35182
- Aircraft time: 48,024 hours, 14,347 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Sensor
- Part number: MS280341
- Condition: Failed
- Location: Left A/C Pack
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019080953337

## Discrepancy

WHEN AIR TEMP SELECTOR KNOB IS ROTATED TO CHECK OUTPUT OF LEFT PACK, IT SHOWS OFF SCALE - 0 DEGREE. OUTPUT OF RT PACK SHOWS A NORMAL 18-22 DEGREE ALL ZONES ARE COMFORTABLE AND CONTROLLABLE. TRIM AIR IS ON AND PACKS ARE AUTO. GROUNDED - YES. REMOVED AND REPLACED PACK TEMP BULB ON LEFT PACK REF B737-800 AMM 21-51-60. CABIN TEMP. INDICATOR READS 19-21 DEGREES ON LEFT PACK. TEMP INDICATOR AND THERMOMETER READINGS AGREE. L PACK AND R PACK AGREE.

---
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.