# SDR ASAA2020030432347

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 3, 2020
- Submitted: March 4, 2020
- Operation: Air carrier
- Aircraft: [N467AS](https://openairdocs.org/aircraft/N467AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36362
- Aircraft time: 22,537 hours, 7,359 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Unknown
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: LD
- 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/ASAA2020030432347

## Discrepancy

PRESSURIZATION AUTOFAIL AFTER LANDING. GROUNDED - YES. ACCOMPLISHED AUTO FAIL LIGHT ON- FAULT ISOLATION NO FAULTS NOTED REF B737-900 FIM 21-31 TASK 827. ACCOMPLISHED DCPC BITE PROCEDURES #1 CONTROLLER SHOWED NO EXISTING FAULTS 1 FAULT HISTORY OFV LRU FAIL. RESET #1 CONTROLLER NO FAULTS NOTED. #2 CONTROLLER NORMAL NO FAULTS NOTED REF FIM 21-31 TASK 801. PERFORMED PRESSURIZATION SYS GROUND TEST BOTH #1 & #2 CONTROLLERS TEST PASSED. GROUND VERIFICATION TEST PASSED REF B737-900 AMM 21-31-00-700-802. RECHECK DCPU BITE TEST ON BOTH CONTROLLERS NO FAULTS NOTED REF FIM 21-31 TASK 801.

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