# SDR CA140212003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 11, 2014
- Submitted: September 14, 2015
- Operation: General aviation
- Make and model: Bombdr DHC8400
- Aircraft time: 2,367 hours
- Engine: Pwc PW150A
- System (JASC): [5230 · Cargo/Baggage Doors](https://openairdocs.org/jasc/5230)
- Part: Blowout Panel
- Condition: Popped
- Location: Cargo Door
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA140212003

## Discrepancy

(CAN) DURING DEPARTURE, THE ACFT WAS UNABLE TO PRESSURIZE.  THE CREW RETURNED TO THE AIRPORT DUE TO NOT BEING ABLE TO CONTROL PRESSURIZATION AFTER TAKEOFF DURING THE CLIMB IN AUTO AND MANUAL PRESSURIZATION MODES.  CREW REPORTED THE CABIN ALTITUDE WAS INCREASING WITH THE VERTICAL SPEED.  UPON INITIAL INVESTIGATION BY MAINTENANCE AT THE GATE, THEY CONFIRMED THE AFT CARGO CANTED BLOW OUT PANEL WAS POPPED OUT.  DURING TROUBLESHOOTING MAINTENANCE FOUND WATER IN THE CARGO DOOR SEAL SYS. MAINTENANCE REPLACED THE CARGO DOOR SEAL PRESSURIZATION DESICCANT FILTER, PN 8SC5028-001 IAW AMM 52-13-26 AND PURGED THE DOOR SEAL LINES WITH NITROGEN.  FOUND DURING TROUBLESHOOTING THE CARGO DOOR SEAL CONTROL VALVE WAS FROZEN.  MAINTENANCE REPLACED THE CONTROL VALVE, PN 4100S031-01 IAW AMM 52-31-31 AND CARRIED OUT ALL PRESSURIZATION RUNS IAW AMM 21-31-00 AND 21-00-00 WITH NO FAULTS NOTED. ACFT RETURNED TO SERVICE.  ACFT AFH 2676.12, AFC 1935, CARGO DOOR SEAL CONTROL VALVE IS OEM. TSN 2676.12 HRS AND 1935 CYC.

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