Boam RANS S-6S N4427M

Summary

On 18 September 2010 at about 15:10 local time, a Boam RANS S-6S registered N4427M was involved in an accident near Roberts, Idaho, United States. One person was 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

18 September 2010 at 15:10

Classification

Accident

Location

Roberts, Idaho, United States

Nearest airport

Tanner Airstrip (PVT)

Coordinates

43.7186, -112.1206

Aircraft

Boam RANS S-6S

Registration

N4427M

Category

Airplane

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Roberts → Rigby

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

WPR10LA483

Nobody was injured.

A loss of engine power due to the detachment of the left carburetor from the engine inlet manifold. Contributing to the accident was the pilot's failure to address a known engine vibration.

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

Read the full NTSB narrative

The pilot, who was also the airplane's owner, reported that the engine of the experimental amateur-built airplane experienced a partial loss of power while turning onto the crosswind leg of the traffic pattern after the initial takeoff climb. The pilot initiated a return to the runway, during which time the engine lost all power. The pilot unsuccessfully attempted to restart the engine and subsequently performed an off-airport landing. The airplane's right main landing gear collapsed during the landing roll, resulting in substantial damage to the airframe. Examination of the engine revealed that the left carburetor was detached from the engine inlet manifold. The impact trajectory, coupled with a lack of witness marks indicating the carburetor had struck any part of the airplane, make it most likely that the carburetor detached in flight. The owner/pilot reported that he had experienced excessive engine vibration and "kickback" during prior startups. He had considered a number of remedial measures to rectify the problem, but had not performed any of these measures prior to the accident flight. He additionally reported that he could have reduced the likelihood of the carburetor separating by more thoroughly examining the tension of its mounting hardware.

Quoted verbatim from the NTSB record.