# Accident 20040424009199A: Cessna 172N, Lyons, CO, April 24, 2004

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: April 24, 2004, 10:50 local time
- Place: Lyons, CO
- Damage: Substantial damage
- Phase of flight: Sfl Cruise
- Operating rules: General operating rules (Part 91)
- Location: 40.2250° N, 105.2667° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=40.2250&lon=-105.2667&mi=10
- Aircraft: N5048E, a cancelled registration (https://openairdocs.org/deregistered/N5048E-2011-08-04) (OpenAirDocs)
- Registry model: Cessna 172N (registry code 2072434, https://openairdocs.org/model/cessna-172n) (OpenAirDocs)
- Registry engine: Lycoming 0-320 series (registry code 41508, https://openairdocs.org/engine/lycoming-0-320-series) (OpenAirDocs)
- Reported make and model: CESSNA 172N
- Reported engine: LYC O320H2AD
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 1,195 total, 180 in this make and model, 27 in the last 90 days
- NTSB investigation: [NTSB DEN04CA067](https://openairdocs.org/ntsb/DEN04CA067) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20040424009199A

## Narrative

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

(-23) AIRCRAFT DEPARTED LONGMONT VANCE BRAND AIRPORT (2V2) ON A TRAINING FLIGHT WITH AN INSTRUCTOR AND STUDENT ON BOARD. THE STUDENT PILOT UNDER DIRECTION OF THE INSTRUCTOR INITIATED A CRUISE DESCENT AT 2200 RPM. ACCORDING TO THE INSTRUCTOR, HE SIMULATED AN ENGINE FAILURE DURING THIS DESCENT BY APPLYING CARBURETOR AND HEAT REDUCING POWER TO 1400 RPM. STUDENT SLOWED TO 65-70 KTS AND INSTRUCTOR REDUCED POWER FURTHER TO IDLE. INSTRUCTOR STATES HE NOTICED A LOSS OF POWER OR CHANGE IN SOUND DURING THE DESCENT. INSTRUCTOR ADVANCED THROTTLE AND RECEIVED NO RESPONSE FROM ENGINE. INSTRUCTOR ENRICHED MIXTURE AND ADVANCED THROTTLE AGAIN AND RECEIVED A SURGE IN RPM. INSTRUCTOR UNABLE TO GET ANY FURTHER RESPONSE FROM ENGINE AND COMPLETED THE ENGINE FAILURE CHECKLIST. INSTRUCTOR COULD NOT RESTART ENGINE AND LANDED POWER OFF ON A ROAD. IN ORDER TO AVOID TWO CYCLISTS INSTRUCTOR SWERVED INTO THE LEFT DITCH AND HIT A POLE CAUSING SUBSTANTIAL DAMAGE TO THE AIRCRAFT. DAMAGE INCLUDED THE LEFT HORIZONTAL STABILIZER, TWISTING OF THE AFT SECTION OF THE FUSELAGE AND AFT WING SPAR DAMAGE TO THE LEFT MAIN WING CAUSED BY STRIKING SIGNS AND POLES. THERE WERE NO INJURIES.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB DEN04CA067](https://openairdocs.org/ntsb/DEN04CA067), Apr 24, 2004: Cessna 172N (N5048E), Lyons, CO, substantial damage. Probable cause: a loss of engine power due to carburetor icing. Contributing factors were weather conditions conducive to carburetor icing and unsuitable terrain available on which to make a forced landing and the…

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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