# SDR XV6A2011061200010

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 12, 2011
- Submitted: June 14, 2011
- Operation: Air carrier
- Aircraft: N743VA
- Make and model: Boeing 737-46B
- Registry model: [Boeing 737-46B](https://openairdocs.org/model/boeing-737-46b) (OpenAirDocs)
- Aircraft serial: 25262
- Aircraft time: 50,160 hours, 26,911 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 7638101
- Part serial: 89094410
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/XV6A2011061200010

## Discrepancy

CLIMBING TO FL360, RECEIVED ALTITUDE WARNING.  TRIED CONTROL W/STDBY, NOTHING, MANUAL, NOTHING.   BOTH PACKS IN AUTO, CABIN CLIMBED AGAIN.  DECENDED TO 10,000 FT, C/W QRH, CONTINUED TO DESTINATION.  TROUBLESHOT IAW AMM 21-31-00.  REPLACED PRESSURE CONTROLLER.  PERFORMED CHECK FLT & FOUND GOOD.  TEAR DOWN OF PRESSURE CONTROLLER.  CONTROLLER FAILED TEST.  PC2 TRANSDUCER OUTPUT OUT.  AUTO MODE RESET FUNCTION INOP.  POWER MONITOR ADJUSTMENT OUT, IN AUTO & STANDBY MODES & AC ACTUATOR DRIVER ERRATIC.  ON DISASSEMBLY, 1 BROKEN SCREW & LOOSE SCREWS SECURING INTERCONNECT BOARD.  FOUND OPEN CIRCUITS, P1B-37 & P1B-19.  TROUBLESHOT AC ACTUATOR.  REPLACED TRANSISTORS Q2014, Q2016, Q2015, Q2011 & INSTALLED SB21-113.

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