Cessna 140 N89093

Summary

On 14 August 2018 at about 16:30 local time, a Cessna 140 registered N89093 was involved in an accident near Marsing, Idaho, United States. 2 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

14 August 2018 at 16:30

Classification

Accident

Location

Marsing, Idaho, United States

Nearest airport

Sunrise Skypark (ID40)

Coordinates

43.4147, -116.6983

Aircraft

Cessna 140

Registration

N89093

Category

Airplane

Year built

1946

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Nampa → Nampa

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

WPR18LA224

Nobody was injured.

The loss of engine power during a low pass as a result of a blockage of the carburetor idle chambers which led to a forced landing in a river.

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

Read the full NTSB narrative

During a low pass over the runway, the pilot advanced the throttle, but the engine failed to respond. After switching fuel tanks, the pilot initiated a forced landing to a shallow part of a river that paralleled the runway. The airplane came to rest upright in the river, partially submerged, and sustained substantial damage to the lower fuselage and firewall. Postaccident examination of the airplane revealed that the engine initially would not run. The carburetor was removed, partially disassembled, and examined. Evidence of corrosion was observed in the float bowl. The carburetor bowl was cleaned internally, reassembled, and reinstalled on the engine. Additional attempts to run the engine revealed that the engine would not run at power settings below 1,300 rpm. Subsequent examination of the carburetor revealed that the throttle shaft was loose in its bushings or mounting to the casting. When the carburetor was installed on a fuel flow bench, immediate leaks were noted audibly, one at the throttle shaft seals and one in the area of the accelerator pump. Indications of blockage in the idle chambers of the carburetor were present, and at idle ranges, the fuel flows were significantly out of specification which likely led to the loss of engine power. Removal of the idle tube showed significant corrosion and contaminants in that area. The source of contaminants was not determined.

Quoted verbatim from the NTSB record.