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ASN Wikibase Occurrence # 60831
Last updated: 19 June 2020
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Type:Silhouette image of generic ask1 model; specific model in this crash may look slightly different
Schleicher ASK 21
Owner/operator:Skylark North
Registration: N361KS
C/n / msn: 21224
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Tehachapi, CA -   United States of America
Phase: Initial climb
Departure airport:Tehachapi, CA (L94)
Destination airport:Tehachapi, CA (L94)
Investigating agency: NTSB
The glider was being towed to altitude by a tow airplane. During the takeoff initial climb, the spoiler handle was not locked and the spoilers momentarily extended twice and although the pilot felt that he had to input forward control forces, he did not visually check the position of the spoiler control handle. The tow pilot then gave a rudder wave signal to the pilot telling him to check the spoilers; however, because the spoilers appeared retracted when the pilot verified their position, the glider pilot misinterpreted the tow pilot and released the glider from the tow airplane at approximately 100 feet above ground level. The glider pilot force-landed the glider in a field. During the landing, the empennage broke from the remainder of the glider. The glider pilot did not report any mechanical malfunctions with the glider.
Probable Cause: The pilot's inadequate preflight procedures and failure to check the spoiler control position, which resulted in the inadvertent deployment of the spoilers during takeoff. A contributing factor was the pilot's misinterpretation of the tow pilot's instructions.



Revision history:

22-May-2009 10:50 DColclasure Added
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
03-Dec-2017 10:51 ASN Update Bot Updated [Cn, Operator, Total occupants, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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