# SDR DALA2021042102335

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 17, 2021
- Submitted: April 21, 2021
- Operation: Air carrier
- Aircraft: [N649DL](https://openairdocs.org/aircraft/N649DL), registered now
- Make and model: Boeing 757232
- Aircraft serial: 24389
- Aircraft time: 90,325 hours, 39,512 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Control Panel
- 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/DALA2021042102335

## Discrepancy

SHIP 0649-PRESS- CABIN ALTITUDE EXCEEDED 10K FEET WHILE AT FL400. AFTER DESCENT TO FL280 & USING MANUAL CONTROL, THE AUTO CONTROLLER MONITORED CABIN ALTITUDE AT 5K FEET. INITIAL CORRECTIVE ACTION: APPLIED MEL. FOLLOW UP CORRECTIVE ACTION (4/18 MSP): REPLACED CABIN PRESSURE CONTROL PANEL, RT PACK FLOW CONTROL VALVE, CABIN PRESSURE OUTFLOW VALVE, BOTH CABIN PRESSURE CONTROLLERS. FIXED RT PACK SUPPLY & LT PACK PRI HEAT EXCHANGER DUCT LEAKS. SINGLE PACK & HULL DECAY CHECKS OK.

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