Cessna 206F N8411Q

Summary

On 1 September 2006 at about 16:30 local time, a Cessna 206F registered N8411Q, operated by Waters Aero-Marine, was involved in an incident near Matinicus Islnd, Maine, United States. 3 people were on board and nobody was injured. The aircraft was slightly damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

1 September 2006 at 16:30

Classification

Incident

Location

Matinicus Islnd, Maine, United States

Nearest airport

Matinicus Island Airport (35ME)

Coordinates

44.6931, -69.3819

Aircraft

Cessna 206F

Registration

N8411Q

Category

Airplane

Engines

1

Operator

Waters Aero-Marine

Operating rule

Part 135: Air Taxi & Commuter

Phase of flight

Not recorded

Route

Maticus Island → Owls Head

Aircraft damage

Minor

Weather

VMC

Light

Day

NTSB number

NYC06IA226

Nobody was injured.

An engine kick back of undetermined origin during engine start.

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

Read the full NTSB narrative

After engine start, the pilot heard "an abnormal engine mechanical noise." He shut down the engine and requested a mechanic. During a subsequent engine start, the mechanic confirmed the mechanical engine noise, and the engine was again shut down. Hand propping revealed that the engine would sometimes "mechanically jam," and further examination revealed the fracture of two crankshaft gear teeth. Both gear teeth exhibited signatures consistent with overload. Corresponding starter adapter gear teeth, that would have meshed with the crankshaft gear teeth during the startup, were cracked on the loaded side. All evaluated metallurgical requirements were met, including core hardness, surface hardness and case depth. Although a single "kick back" while cranking could cause the failure of components of the cranking system, there was no evidence as to why a kick back may have occurred.

Quoted verbatim from the NTSB record.