Piper PA-18-150 N13973

Summary

On 4 September 2011 at about 23:00 local time, a Piper PA-18-150 registered N13973, operated by Richardson James K, was involved in an accident near McGrath, Alaska, United States. One person was on board and one was seriously injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

4 September 2011 at 23:00

Classification

Accident

Location

McGrath, Alaska, United States

Nearest airport

McGrath (PAMC)

Coordinates

62.9528, -155.6069

Aircraft

Piper PA-18-150

Registration

N13973

Category

Airplane

Engines

1

Operator

Richardson James K

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Kingston Creek → McGrath

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

ANC11FA093

1 person was seriously injured.

The pilot inadvertently switched off the engine magnetos during short final approach, which resulted in a loss of engine power. Contributing to the accident was the manufacturer's placement of the magneto switches in the cabin.

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

Read the full NTSB narrative

The airplane was on short final approach to the airport when its engine would not respond to throttle input. The airplane descended into trees and impacted terrain. The pilot reported that immediately prior to the loss of engine power, he had made an elevator trim control adjustment and was in the process of making a throttle adjustment when he heard a snap and the engine quit operating, "as if the magnetos had been shut off." Examination of the airplane established that the throttle cable was intact. The engine was run, and no anomalies were noted. During the engine run, the magneto switches were turned off while the engine was at cruise rpm. The switches made an audible click/snap when turned off. Following a similar August 29, 2011, accident also involving a Piper PA-18 airplane, the pilot reported that, during the initial climb, he inadvertently switched off the engine magnetos with his coat sleeve while using the trim handle, causing the airplane’s engine to shut down. As with this accident airplane, the magneto switches were located on the left side of the cabin, just above the trim handle. As a result of incidents involving the inadvertent shutting off of the magneto switches, the Federal Aviation Administration published a notice of proposed rulemaking announcing its intent to issue an airworthiness directive requiring the reconfiguration of the magneto switches on Piper PA-18 airplanes. Given the absence of any mechanical issues with the airplane, as well as the location of the magneto switches and the trim handle, it is likely the pilot inadvertently shut off the magnetos switches while trimming the airplane on short final approach.

Quoted verbatim from the NTSB record.