# NTSB SEA00LA096: AS+ AS-4, N1995M, Ephrata, WA, May 29, 2000 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: May 29, 2000, 11:45 local (18:45 UTC) - Place: Ephrata, WA - Coordinates: 47.26902, -119.589683 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=47.2690&lon=-119.5897&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report May 9, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 49352 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA00LA096 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/49352/pdf - Page: https://openairdocs.org/ntsb/SEA00LA096 ## Probable cause The pilot's improper in-flight decision by not immediately seeking a safe landing site upon encountering the sink. A factor was the high vegetation (sagebrush). ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Forced landing, descent - in-flight planning/decision - improper, pilot in command (cause) - Dragged wing,rotor,pod,float or tail/skid, landing - roll - terrain condition - high vegetation (contributing factor) ## Analysis After being towed several miles west of the departure airport and to 4,300 feet MSL, the glider pilot released from the towplane. Shortly thereafter, he encountered a sink and turned west and north, away from the airport, during which the sink conditions did not abate. Having lost 1,100 feet in altitude, the pilot decided that he could not return to the departure airport, and once again turned west and north in search of lift. He then turned towards a plowed field in which to land but, still encountering sink conditions, landed 1/4 to 1/3 of a mile short in sagebrush covered terrain. During the landing roll the glider ground looped to the right damaging the tail-boom. The pilot reported that he should have immediately turned back to the departure airport when the heavy sink was encountered. ## Factual narrative On May 29, 2000, approximately 1145 Pacific daylight time, a Russia AS+ sailplane model AS-4, N1995M, registered to Evergreen Soaring, Inc., and being flown by a private pilot, sustained substantial damage during an off-airport landing approximately four nautical miles northwest of Ephrata, Washington. The pilot was uninjured. Visual meteorological conditions existed and no flight plan had been filed. The flight, which was personal, was operated under 14CFR91, and originated from Ephrata, approximately 15 minutes prior to the accident. The pilot reported that after departing Ephrata and flying west several miles, he released from the towplane about 4,300 feet above mean sea level (MSL). Ephrata airport elevation was 1,272 feet MSL. Once released from the towplane he resumed level flight, and thermalled for several minutes beneath a cumulous cloud while flying over the ridgeline west of Ephrata. After regaining altitude back to 4,300 feet MSL, the pilot noted that lift began to dissipate and he turned west in search of improved lift conditions. Approximately one minute later he encountered heavy sink and continued flying west for another minute during which the sink conditions continued. He then turned north but the sink conditions persisted. The glider's altitude was approximately 3,200 feet MSL, and he decided that he could not make a safe return to the Ephrata airport from his current location. The pilot once again turned west towards a cumulous cloud "thinking that I would find lift there" but did not. He then noticed a large plowed field and turned north on a direct line towards it. He reported that he "was still in considerable sink and ended up landing approximately 1/4 to 1/3 mile south of the plowed field in a sagebrush field." He reported that upon ground impact the glider immediately ground looped to the right damaging the tail-boom. In the data element titled "Recommendation (How could this accident have been prevented)" on the pilot's completed NTSB Form 6120.1/2, the pilot wrote: "Pilot should have immediately turned back to [the] departure airport when heavy sink was encountered." ## Aircraft - Registration: [N1995M](https://openairdocs.org/aircraft/N1995M), registered now, S/N 011, built 1995 (OpenAirDocs) - Reported make and model: AS+ (RUSSIA) AS-4 - Registry model: [AS+ AS-4](https://openairdocs.org/model/as-plus-as-4) (registry code 05601ZH) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Glider - Serial number: 011 - Airframe hours: 219 - Engines: unknown - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Kramer, Craig J. - Registered owner: Evergreen Soaring, Inc. - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, April 29, 2000, 6 hours before - Departed: EPH, EPHRATA, WA ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 48; private; seat: front; flight hours: 83 total, 57 as pilot in command, 3 in the last 90 days, 2 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 300° at 3 knots - Visibility: 20 statute miles - Lowest ceiling: 6,000 ft broken - Temperature: 66 °F, dew point 37 °F - Altimeter: 30.00 inHg - Observed at: EPH, 4 nm away ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20000529006459A](https://openairdocs.org/incident/20000529006459A), May 29, 2000: Ephrata, WA, No damage. (-23) Glider departed Ephrata under an overcast. Unable to escape area of sinking air. Made forced landing in field with substantial damage to aircraft. From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.