# SDR YENA2023010600019

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 3, 2023
- Submitted: January 6, 2023
- Operation: Air carrier
- Aircraft: N197JB
- Make and model: Emb ERJ 190-100 IGW
- Registry model: [EMB ERJ 190-100 IGW](https://openairdocs.org/model/embraer-erj-190-100-igw) (OpenAirDocs)
- Aircraft serial: 020
- Aircraft time: 43,565 hours, 28,258 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Heat Exchanger
- Part number: 10028321
- Part serial: 437
- Condition: Failed
- Part time: 21,631 hours, 14,839 cycles
- Stage of operation: CL
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/YENA2023010600019

## Discrepancy

FLT#1745, BOS-CLT. (AIRCRAFT PERFORMED AN AIR TURN BACK T BOS) ' CABIN PRESSURIZATION CYCLING UP AND DOWN AS MUCH AS 2500 FPM DURING CRUISE. MANUAL CONTROL OF THE OUTFLOW VALVE IS NO HELP. BLEED PRESSURES CYCLING FROM 10 PSI TO 48 PSI. BOTH BLEED CYCLING PRESSURE BUT MORE SO ON THE RIGHT; REF DEFECT 3582714-1 (REMOVED AND REPLACED ACM IAW AMM 21-51-05 UP TO ITEM, SUBTASK 420-002-A STEP # 9), 3582714-2, 3582713-1 (REMOVED AND REPLACED DUAL HEAT EXCHANGER IAW AMM 21-51-04. OPS CHECK AND LEAK CHECK REQUIRED.), 3582713-2 (OPS CHECK AND LEAK CHECK PER AMM 21-51-00) FOR CORRECTIVE ACTION.'

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.