No fatalities

Private Pilot Hand-Props Engine and Departs with Left Magneto Only, Damages Stabilizer (N7939B)

Palmer, AK, US

On September 24, 2006, a Cessna 172 (registration N7939B) was involved in an aviation accident near Palmer, AK. No fatalities were reported. Investigators recorded the probable cause as: The pilot's failure to follow the checklist to ensure the proper positioning of the magneto switch during the takeoff roll, which resulted in a partial loss of engine power, and a subsequent collision with high vegetation during the takeoff run. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-07-04Data APIEditorial standards

A private pilot hand-propped his airplane after a dead battery, departed from a 900-ft remote area, collided with brush during takeoff, and later discovered the magneto switch was not set to both, reducing engine power.

Incident Overview

A private certificated pilot conducting a personal flight under 14 CFR Part 91 experienced difficulties before takeoff from a remote departure area approximately 900 feet in length. The pilot reported a prior issue with the airplane's charging system. When attempting to start the engine for departure, he found the battery dead.

Pre-Takeoff Actions

To start the engine, the pilot placed the magneto switch on the left magneto position and manually hand-propped the engine. He then initiated the takeoff roll, which he noted was longer than expected.

Collision on Takeoff

To avoid trees at the end of the departure area, the pilot applied left rudder to maneuver past them. During this maneuver, the right horizontal stabilizer and right elevator collided with high brush. The airplane became airborne, and the pilot continued to his destination, approximately 8 miles away.

Post-Landing Discovery

Upon landing, the pilot observed substantial damage to the stabilizer and elevator. He also discovered that the magneto switch had remained in the left magneto position throughout the flight; he had not selected the "both" magneto position prior to takeoff, which reduced available engine power.

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Frequently asked questions

What happened in the 24 Sept 2006 Cessna 172 accident near Palmer, AK?

A private pilot hand-propped his airplane after a dead battery, departed from a 900-ft remote area, collided with brush during takeoff, and later discovered the magneto switch was not set to both, reducing engine power.

Were there any fatalities in the 24 Sept 2006 Cessna 172 accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 24 Sept 2006 involved a Cessna 172, registration N7939B, at Palmer, AK.

What was the probable cause of the accident?

The pilot's failure to follow the checklist to ensure the proper positioning of the magneto switch during the takeoff roll, which resulted in a partial loss of engine power, and a subsequent collision with high vegetation during the takeoff run. A factor contributing to the accident was the pilot's improper…

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20061013X01511. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.