# SDR ASAA2019020928133

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 9, 2019
- Submitted: February 12, 2019
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 40,178 hours, 12,044 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019020928133

## Discrepancy

ON RECALL "CONT CAB" ZONE TEMP LIGHT REMAINED ILLUMINATED WITH AIR COND LIGHT. LIGHT EXTINGUISH WITH MASTER CAUTION RESET. GROUNDED - YES. UNABLE TO DUPLICATE DEFECT - MASTER CAUTION RECALL SHOWED NO ZONE TEMP LIGHTS, BITE OF BOTH PACK/ZONE TEMP CONTROLLERS PER FIM 21-62 TASK 801 SHOWED NO FAULTS ON EITHER CONTROLLER, AND VERIFY TEST PASSED FOR BOTH WITH NO FAULTS. PERFORMED OPERATIONAL TEST OF CABIN TEMPERATURE CONTROL AND INDICATION SYSTEM PER AMM 21-61-00-700-807-002 - ALL TESTS PASSED.

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