# SDR P5CA2018061500091

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 10, 2018
- Submitted: June 15, 2018
- Operation: Air carrier
- Aircraft: [N858GT](https://openairdocs.org/aircraft/N858GT), registered now
- Make and model: Boeing 747-87UF
- Registry model: [Boeing 747-87UF](https://openairdocs.org/model/boeing-747-87uf) (OpenAirDocs)
- Aircraft serial: 37569
- Aircraft time: 28,114 hours, 4,622 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Warning Message
- Condition: False Activation
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA2018061500091

## Discrepancy

CABIN ALTITUDE EICAS DURING CRUISE,  NO EICAS MESSAGE FOUND.  STS MESSAGE, & CMC MESSAGE AFT ARR SPOT.  BOTH OUTFLOW VALVE TESTED OKAY.  ALL DOOR & OUTLETS OK,  BOTH CPCS GND TEST PASSED AIW AMM 21-31-00/501.  DOOR & SEAL INSPECTED OF ALL REVR AND OUTFLOW IAW AMM 52-11-00, 52-34-00, 52-36-00, AND 52-48-01.

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