# Accident 20190809013629A: Cessna 206, Prospect, OR, August 9, 2019

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: August 9, 2019, 18:20 local time
- Place: Prospect, OR
- Damage: Substantial damage
- Phase of flight: Cruise/Level Flight
- Operating rules: Air taxi and commuter (Part 135)
- Operator: S1ZA
- Location: 42.6500° N, 122.3250° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=42.6500&lon=-122.3250&mi=10
- Aircraft: N5152U, a cancelled registration (https://openairdocs.org/deregistered/N5152U-2022-10-01) (OpenAirDocs)
- Registry model: Cessna 206 (registry code 2073302, https://openairdocs.org/model/cessna-206) (OpenAirDocs)
- Registry engine: Continental IO-520 series (registry code 17032, https://openairdocs.org/engine/continental-io-520-series) (OpenAirDocs)
- Reported make and model: CESSNA 206
- Reported engine: CONT MOTOR IO 520 SERIES
- People aboard: 2
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Commercial pilot
- Pilot flight hours: 2,355 total
- NTSB investigation: [NTSB WPR19LA217](https://openairdocs.org/ntsb/WPR19LA217) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20190809013629A

## Narrative

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

N5152U WAS OPERATING UNDER PART 135 RULES DOING FOREST FIRE WATCH PATROL ON 08/09/19 IN THE MOUNTAINS NEAR PROSPECT, OR WHEN THE PILOT EXPERIENCED A TOTAL SUDDEN ENGINE FAILURE AT ABOUT 3:30 PM PDT.  PILOT REPORTED SUDDEN VIOLENT SHAKING OF AIRPLANE SO SEVERE THAT INSTRUMENTS COULD NOT BE READ, AND STARTED EMERGENCY ENGINE SHUTDOWN PROCEDURES FOR AN EMERGENCY LANDING.  PILOT PULLED MIXTURE AND ENGINE STOPPED FIRING, BUT PROPELLER KEPT TURNING SLOWLY.  PILOT FOUND CLEARING IN FOREST MARSH AREA AND MADE POWER OFF EMERGENCY LANDING.  AIRCRAFT WAS SUBSTANTIALLY DAMAGED BUT REMAINED UPRIGHT AND BOTH PILOT AND PASSENGER WERE UNHURT.  NTSB RELEASED AIRPLANE FOR RECOVERY FROM MOUNTAIN CLEARING AND OPERATOR WAS INSTRUCTED NOT TO PERFORM ANY MAINTENANCE OR PART REMOVAL EXCEPT FOR RADIOS.

AIRCRAFT WAS SENT TO OPERATOR'S HANGAR FOR QUARANTINE AND STORAGE PENDING ENGINE REMOVAL.

DURING RECOVERY OPERATOR'S DIRECTOR OF MAINTENANCE (DOM) REMOVED CYLINDER ROCKER BOX COVERS WITHOUT AUTHORIZATION FROM FAA OR NTSB AND FOUND #1 CYLINDER HAD BOTH PUSHRODS FAR DOWN IN PUSHROD TUBES.  BROKEN ENGINE CAMSHAFT AT LEAST IS SUSPECTED.  NTSB HAS AUTHORIZED TEARDOWN OF ENGINE AT MANUFACTURER, AND FOLLOW UP AMENDMENT OF THIS REPORT IS PLANNED AFTER TEARDOWN IS COMPLETED.

NTSB HAS ALSO AUTHORIZED A CALIBRATION AND ACCURACY TEST OF THE OIL TEMPERATURE INDICATING SYSTEM IN FOLLOW UP TO THE ACCIDENT.

## 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 WPR19LA217](https://openairdocs.org/ntsb/WPR19LA217), Aug 10, 2019: Cessna 206 (N5152U), Prospect, OR, substantial damage. Probable cause: The failure of the counterweight retainer pin plate which resulted in a total loss of engine power.

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.

---
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.