GRUMMAN AMERICAN AVN. CORP. AA-5 near Yacoit, WA — 2011-07-05

Probable cause

The pilot’s failure to maintain clearance from terrain.

NTSB narrative

The pilot reported that the airplane was climbing to cruise altitude up a valley in mountainous terrain when he felt a "small bump" and that the airplane subsequently began descending. While maintaining a low altitude to avoid overlying controlled airspace, he initiated a left turn to avoid rising terrain ahead, but a wing collided with a tree. The airplane came to rest in a gravel pit. The pilot reported no preimpact mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Analysis

Primary failure mode

Loss of control

First missed decision gate

Pilot could have maintained altitude instead of initiating a turn to avoid terrain.

NTSB coding

• Controlled flight into terr/obj (CFIT) · Enroute-climb to cruise

Evidence available

• 4 docket documents

Docket documents4

• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1form
• Record of Conversation FAA Inspector Pilot and Passenger Interviewsinterview
• Fuel Receiptother
• Record of Conversation FAA Inspector Site Notesother

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