# Incident 20250517018599I: Boeing 737-800, Denver, CO, May 17, 2025

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: May 17, 2025, 17:30 local time
- Place: Denver, CO
- Damage: No damage
- Phase of flight: Descent
- Operating rules: Air carrier (Part 121)
- Operator: CALA
- Location: 39.7392° N, 104.9847° W: Placed by OpenAirDocs: center of Denver, CO, within about 7 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.7392&lon=-104.9847&mi=10
- Aircraft: N77542, registered now (https://openairdocs.org/aircraft/N77542) (OpenAirDocs)
- Registry model: Boeing 737-800 (registry code 1384414, https://openairdocs.org/model/boeing-737-800) (OpenAirDocs)
- Registry engine: CFM International CFM56-7B26E series (registry code 13099, https://openairdocs.org/engine/cfm-international-cfm56-7b26e-series) (OpenAirDocs)
- Reported make and model: BOEING 737-800
- Reported engine: CFM INTL CFM56-7B26E
- People aboard: 0
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Airline transport
- Pilot flight hours: 1,123 in this make and model
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20250517018599I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

ON MAY 17, 2025, ^PRIVACY DATA OMITTED^, A BOEING B-737-800, OPERATING FROM BALTIMORE, MARYLAND (BWI) TO DENVER, COLORADO (DEN) NOTED A “PACK” LIGHT ILLUMINATION ON THE OVERHEAD PANEL NEARING THE TOP OF DESCENT (TOD) POINT.

THE PILOTS EXECUTED THE CHECKLIST PROCEDURES IN THE QUICK REFERENCE HANDBOOK (QRH). THESE STEPS INCLUDED DONNING OF OXYGEN MASKS FOR THE PILOTS AND DEPLOYMENT OF PASSENGER OXYGEN MASKS. THE PILOTS DECLARED AN EMERGENCY AND CONTINUED INTO DEN. NO INJURIES REPORTED.

CREW PLACED PRESSURIZATION SYSTEM IN MANUAL.

CREW MANUALLY OPENED OUTFLOW VALVE CAUSING THE AIRCRAFT TO DEPRESSURIZE.

CREW RECEIVED CORRECTIVE ACTION TRAINING FROM THE AIR CARRIER.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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