# SDR SCNA20250127029

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 24, 2025
- Submitted: January 27, 2025
- Operation: Air carrier
- Aircraft: [N804SY](https://openairdocs.org/aircraft/N804SY), registered now
- Make and model: Boeing 737-8Q8
- Registry model: [Boeing 737-8Q8](https://openairdocs.org/model/boeing-737-8q8) (OpenAirDocs)
- Aircraft serial: 30689
- Aircraft time: 73,037 hours, 27,862 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Heat Exchanger
- Condition: Dirty
- Location: Zone 100
- Stage of operation: CR
- How discovered: O
- Nature of condition: G, J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SCNA20250127029

## Discrepancy

CABIN DEPRESSURIZATION. BOTH PACK LIGHTS CAME ON, QRH CLEARED LIGHTS THEN THEY CAME ON AGAIN AT 1000MSL.  PERFORMED DCPC BITE, FIM 21-53 TASK 820, FIM 21-31 TASK 803 NO FAULTS FOUND. C/W AMM 21-51-03-160-811 & TASK CARDS 21000001 & 21000002 HEAT EXCHANGER CLEANING. OPS CHECKS NORMAL. AMM 21-00-00-00-040-804 MMEL 21-1 DDG RESTORATION C/W. THIS CLEARS MEL 21-1-1-F

---
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.