# SDR IPXA2021021065530

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 9, 2021
- Submitted: February 10, 2021
- Operation: Air carrier
- Aircraft: [N621UP](https://openairdocs.org/aircraft/N621UP), registered now
- Make and model: Boeing 747-8F
- Registry model: [Boeing 747-8F](https://openairdocs.org/model/boeing-747-8f) (OpenAirDocs)
- Aircraft time: 2,618 hours, 399 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Icu
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CR
- 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/IPXA2021021065530

## Discrepancy

INSPECTION TYPE:NA**NO EMERG DCLD-NO EMERG EQUIP USED-LANDED W/OUT INCIDENT-AC WAS TAKEN OOS**  AT FL310, CABIN ALTITUDE CLIMBED TO 9300 FT, THEN DECREASED TO 6000 FT. APPROX 10 MIN LATE, CABIN PRESS CLIMBED 10800 FEET W/MASTER WARN LT . NNC ACCOMP & CABIN ALTITUDE DECREASED TO 6000 FT.R&R CABIN ALTITUDE MODULE ASSY I/A/W AMM 21-31-03 OPS CHECK GOOD I/A/W AMM 21-31-00 .  R&R LH ICU I/A/W AMM 21-31-10-400-861 OPS CK GOOD.  R&R LCPC PER AMM 21-31-02-0401. NO FAULTS NOTED. ESR IPC 21-31-02-01

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