SCHEMPP HIRTH DISCUS CS near Williams, CA — 2009-08-02

Probable cause

The pilot's failure to maintain clearance with terrain after intentionally releasing from the tow plane at a low altitude during the initial climb.

NTSB narrative

After taking off, the lead pilot in a dual tow elected to perform a precautionary release as a result of a "slack-line" condition. The trail pilot, realizing that his tow rope was now under the lead pilot's right wing, released his tow rope and immediately turned right. Without sufficient altitude or airspeed to return to the airport, the trail pilot tried to level the glider's wings, but could not before the right wing tip impacted terrain. The glider sustained substantial damage to its right wing and empennage.

Analysis

Primary failure mode

Loss of control

First missed decision gate

Pilot could have maintained control instead of instinctively turning right.

NTSB coding

• Glider tow event · Initial climb

Evidence available

• 2 docket documents

Docket documents2

• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1form
• Witness Statementinterview

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