# SDR ASAA2017070621306

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 6, 2017
- Submitted: July 7, 2017
- Operation: Air carrier
- Aircraft: N305AS
- Make and model: Boeing 737990
- Aircraft serial: 30013
- Aircraft time: 57,255 hours, 22,315 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Warning Message
- Condition: False Activation
- Stage of operation: DE
- 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/ASAA2017070621306

## Discrepancy

DURING DESCENT FROM 250 AT APPROXIMATELY FL 215,  HAD CABIN ALTITUDE WARNING.  CABIN ALTITUDE WAS APROXIMATELY 11,000 FT.  CONDUCTED QRC/QRH PROCEDURES.  CABIN STABILIZED DURING DESCENT. PROCEEDED TO NORMAL LANDING.  ACFT GROUNDED.  PERFORMED CABIN PRESSURE CONTROLLER BITE CHECK NR 2 CONTROLLER SHOWED CODE 030, LOW IN FLOW /HIGH LEAKAGE IAW FIM 21-31-801.  INSPECTED AIRFRAME FOR LEAKS, NO ABNORMAL LEAKS FOUND. INSPECTED PNEUMATIC DUCT, PRESSURE BULKHEAD, AND AIR CONDITIONING BAYS, NO DEFECTS FOUND. PERFORMED CABIN PRESSURE LEAK TEST IAW AMM 05-51-01, CHECKED GOOD.

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