# SDR SWAA2021102632658

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 22, 2021
- Submitted: October 26, 2021
- Operation: Air carrier
- Aircraft: [N8747Q](https://openairdocs.org/aircraft/N8747Q), registered now
- Make and model: Boeing 737-8
- Registry model: [Boeing 737-8](https://openairdocs.org/model/boeing-737-8) (OpenAirDocs)
- Aircraft serial: 61870
- Aircraft time: 1,408 hours, 554 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Switch
- Part number: 214C502
- Part serial: AA10341A
- Condition: Failed
- Location: Cabin Pressure
- Stage of operation: CL
- 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/SWAA2021102632658

## Discrepancy

AT APPROX FL 350 CABIN ALTITUDE WARNING HORN ILLUMINATED. COMPLIED WITH QRC/QRH. CABIN ALTITUDE EXCEDED 10000 FEET. WAS ABLE TO REGAIN CONTROL OF CABIN ALT.CABIN ALT WARNING HORN EXTINGUISHED AT APPROX. FL 270 / CHECKED BOTH CPC CONTROLLERS PER AMM 21-31-00 NO FAULTS FOUND. TESTED BOTH CABIN ALTITUDE SWITCHES PER AMM 21-33-00. #2 CABIN ALTITUDE SWITCH FAILED THE TESTR/R'D #1 & #2 CABIN ALTITUDE SWITCHES PER AMM 21-33-04. OPS CHECK GOOD#1 ON ON 214C50-2 SN ON BN 117529 PN OFF 214C50-2 SN OFF AA10341A#2 ON ON/OFF 214C50-2 SN ON BN117529 SN OFF N018249A

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