Cessna 401 N7864F

Summary

On 6 March 1983 at about 00:00 local time, a Cessna 401 registered N7864F, operated by Doug Bensing, was involved in an incident near Bethel, Alaska, United States. 6 people were on board and nobody was injured. The aircraft was slightly damaged. No probable cause statement is available for this record.

Date

6 March 1983 at 00:00

Classification

Incident

Location

Bethel, Alaska, United States

Nearest airport

Bethel (BET)

Coordinates

60.8099, -161.8503

Aircraft

Cessna 401

Registration

N7864F

Category

Airplane

Engines

2

Operator

Doug Bensing

Operating rule

Part 91: General Aviation

Purpose of flight

Business

Phase of flight

Not recorded

Route

Bethel → Fairbanks

Aircraft damage

Minor

Weather

VMC

Light

Night/Dark

NTSB number

ANC83IA053

Nobody was injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

THE ACFT RIGHT ENGINE STARTED EMITTING SPARKS FROM THE COWLING DURING NORMAL CRUISE. THE PILOT NOTED A DROP IN MANIFOLD PRESSURE SO HE REDUCED POWER ON THAT ENGINE AND THE SPARKS STOPPED. THE ACFT WAS LANDED AT BETHEL. THE FIRE DEPT. USED A FIRE EXTINGUISHING AGENT ON THE ENGINE. THE DAMAGE WAS MINOR. INSPECTION OF THE RIGHT ENGINE REVEALED A BROKEN BOLT ONTHE EXHAUST CLAMP WHICH SECURED THE EXHAUST PIPE TO THE TURBOCHARGER. THE CLAMP WHICH SECURED THE PIPE TO THE ENGINE NACELLE HAD SLIPPED OFF THE BRACKET. THIS ALLOWED THE PIPE TO SLIP DOWN AND RELEASE HOT EXHAUST GASES INTO THE ENGINE NACELLE. THIS HEATED THE ENGINE EXCESSIVELY AND REMOVED THE WASTE GATE FROM THE OPERATIONAL SYSTEM OF THE ENGINE. THE BROKEN BOLT IS A PART OF THE CLAMP P/N MVT 68637-375M.

Quoted verbatim from the NTSB record.