# Incident 20250518007859I: Cirrus Design Corp SR20, Boca Raton, FL, May 18, 2025

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: May 18, 2025, 10:50 local time
- Place: Boca Raton, FL
- Damage: Minor damage
- Phase of flight: Cruise/Level Flight
- Operating rules: Pilot school (Part 141)
- Location: 26.3708° N, 80.1026° W: Placed by OpenAirDocs: center of Boca Raton, FL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=26.3708&lon=-80.1026&mi=10
- Aircraft: N654CB, registered now (https://openairdocs.org/aircraft/N654CB) (OpenAirDocs)
- Registry model: Cirrus Design SR20 (registry code 2130000, https://openairdocs.org/model/cirrus-design-sr20) (OpenAirDocs)
- Registry engine: Lycoming IO-390-C3B6 (registry code 42710, https://openairdocs.org/engine/lycoming-io-390-c3b6) (OpenAirDocs)
- Reported make and model: CIRRUS DESIGN CORP SR20
- Reported engine: LYCOMING IO-390-C3B6
- People aboard: 2
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Commercial pilot, flight instructor
- Pilot flight hours: 873 total
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20250518007859I

## Narrative

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

NTSB ACCIDENT NO.: N/A ATQA : A-SO-19-25-041 SAS ACTIVITY NO.: SO19202505010 TASK ID:T-SO19-FY25-0793

REGISTRATION: XXXX MAKE: CIRRUS: SR20 SERIAL NUMBER:  XXXX WHEN: 18MAY2025, AT APPROXIMATELY 1140 HRS.

AT APPROXIMATELY 1140 HOURS ON MAY 18, 2025, NXXXX HAD EMERGENCY LANDING OFF AIRPORT AT THE L-40 CANAL (HILLSBORO CANAL) NORTH OF PARKLAND, FL, AT APPROXIMATELY LAT/LONG 26.364667, -80.268401. THE AIRCRAFT HAD 2 SOULS ON BOARD, WITH NO INJURIES. THE AIRCRAFT SUSTAINED MINOR DAMAGE. THE AIRCRAFT WAS RECOVERED AND TRANSPORTED TO BOCA AIRCRAFT MAINTENANCE AT BOCA RATON AIRPORT (BCT). A POST INCIDENT INSPECTION OF THE AIRCRAFT ENGINE REVEALED NO MECHANICAL ISSUE WITH THE POWERPLANT. DETAILED POST INCIDENT EXAMINATION OF THE ENGINE INDUCTION SYSTEM AND ITS CONSTITUENT COMPONENTS REVEALED THAT HALF OF THE ALTERNATE AIR VALVE WAS UNATTACHED AND WAS LOOSE INSIDE THE ENGINE INDUCTION HOUSING ASSEMBLY. THE OPPOSING HALF REMAINED PARTIALLY INSTALLED ON ITS RESPECTIVE MOUNT/ACTUATOR INSIDE THE INDUCTION TUBE. BASED ON THE AVAILABLE INFORMATION, IT IS LIKELY THAT WHEN THE VALVE FAILED, IT SEPARATED AND WAS PULLED INTO THE INDUCTION HOUSING, PARTIALLY OBSTRUCTING INDUCTION AIRFLOW AND DISRUPTING THE ENGINE’S FUEL/AIR MIXTURE.

P/N 21777-003. THE RIVETS FAILED AND THE BUTTERFLY HALF BECAME STUCK AT THE ENTRANCE OF THE FUEL CONTROL.

PROBABLE CAUSE: A PARTIAL LOSS OF ENGINE POWER DUE TO THE FATIGUE FAILURE OF THE ALTERNATE AIR VALVE, WHICH SEPARATED AND PARTIALLY OBSTRUCTED THE ENGINE’S INDUCTION SYSTEM.

THIS ACTION CLOSES THIS INVESTIGATION INTO THIS INCIDENT.

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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