# SDR ASAA2016120318903

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 3, 2016
- Submitted: December 5, 2016
- Operation: Air carrier
- Aircraft: [N516AS](https://openairdocs.org/aircraft/N516AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39044
- Aircraft time: 30,491 hours, 9,310 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Warning Light
- Condition: False Activation
- Location: Cabin Pressure
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016120318903

## Discrepancy

UPON ESTABLISHING AIRCRAFT ON APU AIR THE AUTOFAIL LIGHT AND ALTN LIGHTS ILLUMINATED. ACFT GROUNDED. VERIFIED FAULT. CYCLED PANEL CONTROL SWITCH FROM AUTO TO MAN & BACK TO AUTO,  ALL LIGHTS OFF. ACCOMPLISHED A DCPC BITE.   FOUND FAULT 001 (COMMUNICATION FAULT) ON NR 2 CONTROLLER.  GROUND TEST PASSED,  NO FAULTS.  DCPC BITE ON CONT NR 1, NO FAULTS. GROUND TEST PASSED, NO FAULTS. IAW FIM 21-31 TASK 801 GROUND VERIFICATION PASSED,  THIS FAULT WAS INTERMITTENT IAW FIM 21-31 TASK 807.

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