Evenson Roger J VANS RV-9A N394RS

Summary

On 29 June 2007 at about 12:25 local time, a Evenson Roger J VANS RV-9A registered N394RS was involved in an accident near Tucson, Arizona, United States. One person was on board and one had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

29 June 2007 at 12:25

Classification

Accident

Location

Tucson, Arizona, United States

Nearest airport

Ryan Field Airport (RYN)

Coordinates

Not recorded

Aircraft

Evenson Roger J VANS RV-9A

Registration

N394RS

Category

Airplane

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Tucson → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

LAX07LA197

1 person had minor injuries.

the loss of engine power during takeoff-initial climb, which resulted from the owner/builder's improper adjustment of the supercharger waste gate valve, that resulted in the failure of the waste gate servo motor.

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

Read the full NTSB narrative

During the takeoff initial climb, the pilot noted a high manifold pressure, and engaged the supercharger pressure override, but the manifold pressure remained the same. The engine began to lose power, and the airplane was no longer able to sustain a climb. The pilot attempted an emergency landing. During the landing sequence, the main gear hit brush and soft dirt, the nose gear dug in, and the airplane nosed over, coming to rest inverted. The airplane was powered by an Eggenfellner EJ-25, which was a water cooled, four cylinder, supercharged, Subaru automobile engine converted for aircraft use. Post accident examination of the engine revealed that a failed waste gate servo motor had prevented the waste gate valve from opening. Prior to the accident, the pilot adjusted the waste gate valve such that it was allowed to go over center and stick, causing failure of the servo motor.

Quoted verbatim from the NTSB record.