Cessna 170B N6352Y

Summary

On 1 May 2005 at about 03:11 local time, a Cessna 170B registered N6352Y was involved in an accident near Portland, Oregon, United States. One person was on board and one died. The aircraft was destroyed. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

1 May 2005 at 03:11

Classification

Accident

Location

Portland, Oregon, United States

Coordinates

45.6047, -122.7258

Aircraft

Cessna 170B

Registration

N6352Y

Category

Airplane

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Pullman → Vancouver

Aircraft damage

Destroyed

Weather

VMC

Light

Day

NTSB number

SEA05FA090

1 person died.

The pilot's inability to control the airplane due to his incapacitation (carbon monoxide poisoning) from a deteriorated engine exhaust muffler. A contributing factor was the inadequate annual inspection by other maintenance personnel.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The airplane was returning to its home airport when the pilot became incapacitated by carbon monoxide fumes from the airplanes engine muffler heat exchanger [the heat control knob was found "On"]. During the last 15 minutes of flight, the radar data shows the airplane flying several meandering 360 degree turns before impacting terrain. Postimpact examination of the engine's muffler revealed a crack around the entire circumference just aft of it's forward flange. The airplane's last annual inspection was completed on February 1, 2005. The FAA, in Federal Aviation Regulation, Part 43: Maintenance, Preventive maintenance, Rebuilding, and Alteration, Appendix D, provides guidelines for an airplane's annual inspection. Section (d) (8) Exhaust stacks--for cracks, defects, and improper attachment. The airplane's manufacturer also provides a checklist for an annual inspection in the aircraft's Service Manual. In the section for the Engine Compartment, #12. Exhaust system for security, leaks, cracks, and burned-out spots. Refer to Paragraph 12-74 [Inspection of the exhaust system].

Quoted verbatim from the NTSB record.