# SDR DXTA2021042141070 - Type: Service difficulty report (as reported; unverified) - Difficulty date: April 21, 2021 - Submitted: April 23, 2021 - Operation: Air carrier - Aircraft: [N363QS](https://openairdocs.org/aircraft/N363QS), registered now - Make and model: Emb EMB-505 - Registry model: [EMB EMB-505](https://openairdocs.org/model/embraer-executive-emb-505) (OpenAirDocs) - Aircraft serial: 50500256 - Aircraft time: 4,799 hours, 3,825 cycles - System (JASC): [2130 ยท Cabin Pressure Control System](https://openairdocs.org/jasc/2130) - Part: Cabin Pressure - Condition: Malfunctioned - Stage of operation: CR - How discovered: O - Nature of condition: J - Precautionary procedure: A - FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/) - Page: https://openairdocs.org/sdr/DXTA2021042141070 ## Discrepancy PRESN AUTO FAIL YELLOW CAS: AT FL400 CRUISE THE FOLLOWING CAS MESSAGES ILLUMINATED: PRESN AUTO FAIL, SWPS FAULT, AP FAIL, AMS CTRL FAIL, YD FAIL, STBY BARO FAIL, GSD 1 FAIL, SEPS ICE SPEED, HSDB FAULT, LEFT MAIN GEAR DISAGREEMENT, ADS 1 HTR FAIL. STARTED AT THE TOP OF THE LIST TO PERFORM EACH ASSOCIATED QRH PROCEDURE. PERFORMED A MANUAL GEAR EXTENSION AS PER THE QRH. SENT CMC DOWNLOADS TO EMBRAER CONTACT CENTER. REF CASE NUMBER: EEJ -04136720. DISPOSITION FROM CONTACT CENTER WAS TO REPOSITIONED GSD41 # 1 AND GSD4 L #2 UNITS. PASSED INFO ALONG TO MCC AND THEY AGREED SINCE THERE WAS NO HISTORY OF FAILURES ON THIS AIRCRAFT. REPOSITIONED GSD41 # L AND GSD4 L #2 UNITS IAW EMB-5058 AMM TASKS 31-41-01-000-801-A, & 31-41-01-400-801-A. PERFORMED SOFTWARE CONFIGURATION UPLOADING OF THE DATA CONCENTRATOR UNITS IAW EMB-5058 AMM TASK 31-41-01-470-801-A. PERFORMED OPERATIONAL TEST OF THE DATA CONCENTRATOR UNITS IA W EMB-505S AMM TASK 31-41-0L-710-801-A. UPLOAD CHECKS AND OPS CHECKS GOOD. --- 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.