# SDR DL72K001291

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 7, 2000
- Submitted: July 14, 2000
- Operation: Air carrier
- Aircraft: N410DA
- Make and model: Boeing 727232
- Aircraft serial: 21222
- Aircraft time: 60,594 hours, 49,941 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Relay
- Condition: Failed
- Location: Pack Valve
- Component: BACR13CG2A
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL72K001291

## Discrepancy

AFTER TAKEOFF PRESSURIZATION AUTO FAILED TO STBY.  ATTEMPTED OPERATION IN STBY AND MANUAL.  CABIN DIDN''T PRESSURIZE.  FOUND PACK VALVE C/B POPPED.  LEVELED AT 8,000 FT, CABIN ALT 8,000. PSI DIF.  ISOLATED POPPING C/B TO R23 RELAY.  REPLACED BOTH R23 AND R22 RELAYS.  RESET C/B, RAN LT AND RT PACKS IN AUTO AND MANUAL.  OPS OK.

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