# SDR ASAA2018060424884

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 31, 2018
- Submitted: June 4, 2018
- Operation: Air carrier
- Aircraft: [N453AS](https://openairdocs.org/aircraft/N453AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36354
- Aircraft time: 17,451 hours, 5,788 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Warning Message
- Condition: False Activation
- Location: Auto Pressure
- Stage of operation: CL
- 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/ASAA2018060424884

## Discrepancy

AUTO PRESSURIZATION FAIL ILLUMINATED DURING CLIMBOUT.  ALT MODE LIGHT ILLUMINATED. SWITCHED TO ALT MODE AND AUTO FAIL LIGHT WENT OUT.  ACFT GROUNDED.  VERIFIED DIGITAL CABIN PRESSURE CONTROLLER NR 1 SHOWS THE FAULT OFV LRU FAIL.  NR 2 SHOWS SYSTEM OK. ACCOMPLISHED DCPC BITE PROCEDURE BITE TEST PASSED,  NO CURRENT FAULTS NOW.  FAULT WAS INTERMITTENT. BOTH CONTROLLERS SHOW SYSTEM OK  IAW FIM 21-31, TASK 802.

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