# SDR K11A2016032772501

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 28, 2016
- Submitted: March 28, 2016
- Operation: Air carrier
- Aircraft: N725CK
- Make and model: Boeing 727224
- Aircraft serial: 22252
- Aircraft time: 63,999 hours, 35,258 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 79090601
- Part serial: 8412575
- Condition: Failed
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/K11A2016032772501

## Discrepancy

PRESSURIZATION CONTROLLER WOULD NOT MAINTAIN PRESSURIZATION IN AUTO, STANDBY, AC/DC, MANUAL MODES.  TEARDOWN REPORT AUTO MODE BOARD ASSY, AF RELAYS, STANDBY BOARD ASSY, OUT OF CALIBRATION.

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