# NTSB LAX98FA007: Schweizer 2-32, N242DB, Warner Springs, CA, October 11, 1997 - Type: NTSB accident investigation - Classification: Accident · Fatal · Field investigation · Final report - Date: October 10, 1997, 17:00 local (Oct 11, 1997, 00:00 UTC) - Place: Warner Springs, CA - Coordinates: 33.280609, -116.599601 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=33.2806&lon=-116.5996&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: Fatal - Injuries: 1 fatal, 1 serious, 1 minor - Status: Completed, report July 31, 1998 - Report: Approved by Office Director - NTSB case key (mKey): 29920 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX98FA007 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/29920/pdf - Page: https://openairdocs.org/ntsb/LAX98FA007 ## Probable cause the pilot's inadvertent flight into instrument meteorological conditions after inadvertently encountering mountain wave and associated downdraft conditions. The obscuration and high/mountainous terrain were related factors. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight encounter with weather, maneuvering - weather condition - mountain wave (cause) - weather condition - downdraft (cause) - flight into adverse weather - inadvertent, pilot in command (cause) - weather condition - obscuration (contributing factor) - vfr flight into imc - inadvertent, pilot in command (cause) - In flight collision with terrain/water, maneuvering - terrain condition - mountainous/hilly (contributing factor) ## Analysis The sailplane pilot departed on a 40-minute scenic flight. The sailplane was released from the airplane tow at 8,000 feet. According to passenger statements, they reached a height of 14,000 feet msl. They also stated that near the end of the flight time, the pilot descended through clouds. The sailplane collided with mountainous terrain about 6,000 feet msl. An ocean/atmosphere scientist glider pilot was flying the same area near the accident time. He stated that the day was dominated by powerful, yet rapidly changing lee wave systems, producing 10/20 knot updrafts and downdrafts in the coastal mountain ranges of the lower Southern California Bight. He stated that the lee wave structure is normally very steady and reliable. Based on about 1,800 hours of flying the wave, he believed that this unusual day was a 1 in 1,000 occurrence changing minute by minute. He stated that on three separate occasions, he encountered abrupt disintegration of a well ordered non-hydrostatic wave, which resulted in the immediate loss of 7,000 to 10,000 feet of altitude. ## Factual narrative HISTORY OF FLIGHT On October 10, 1997, about 1700 hours Pacific daylight time, a Schweizer 2-32, N242DB, operated by Sky Sailing Airport, was substantially damaged during a passenger flight near Warner Springs, California. The pilot sustained fatal injuries, one passenger received serious injuries, and the second passenger received minor injuries. The sailplane departed Warner Springs about 1625 by an airplane tow to a point near Ranchita, California, where it was released at 8,000 feet msl. The sailplane was to remain aloft for a 40-minute scenic flight. Visual meteorological conditions were reported at the time of departure. The sailplane failed to return to Warner Springs during the allotted time and a search was initiated. It was located the next day on Hot Springs Mountain in the Los Coyotes Indian Reservation. According to the passenger statement, they reached an altitude of 14,000 feel msl. They stated at the end of the flight the pilot descended through the clouds. They collided with mountainous terrain about 6,000 feel msl. PERSONNEL INFORMATION The certificated commercial glider pilot had accumulated about 6,636 total glider flight hours. The pilot had flown three previous flights on the day of the accident for a total flight time of 1:20 minutes. AIRCRAFT INFORMATION Examination of the aircraft logbook revealed that the last annual inspection occurred on November 28, 1996. Excerpts from the log are included in this report. METEOROLOGICAL INFORMATION The closest official weather reporting facility was located at NAS Miramar. At 1655, it was reporting: winds 250 degrees at 17 knots with gusts to 25 knots; 7 miles visibility; few clouds at 6,000 feet agl; few clouds at 20,000 feet agl; temperature 80 degrees Fahrenheit; dew point 52 degrees Fahrenheit; altimeter 29.70 inHg. An ocean/atmosphere scientist glider pilot, who was flying the same area near the accident time, stated that the day was dominated by powerful yet rapidly changing lee wave systems producing 10/20 knot updrafts and downdrafts in the coastal mountain ranges of the lower Southern California Bight. Based on 1,800 hours of flying the wave, this unusual day was a 1 in 1,000 occurrence, changing minute by minute. He also stated that the lee wave structure is normally very steady and reliable. The glider pilot's day of soaring started at 1140 and ended back at Warner Springs at 1713. He reported that a complex arrangement of stable and weakly stable layers existed below 16,000 feet, with a deep unstable surface layer which produced upslope convection late in the day with cloud bases at 5,000 feet msl and cloud tops at 9,500 feet. The associated upslope convection obscured all local mountain slopes above 5,000 feet after 1530. The Warner Springs and San Felipe valleys were open with 3/10's scattered cloud coverage. The first encounter that day occurred about 1255 with disintegration of a non-hydrostatic wave and reformation as a hydrostatic wave with plunging flow. This encounter resulted in a loss of 10,000 feet (from 18,000 to 8,000 feet). On three separate occasions he encountered abrupt disintegration of a well ordered non-hydrostatic wave which resulted in the immediate loss of as much as 7,000 to 10,000 feet of altitude. WRECKAGE AND IMPACT INFORMATION On-scene examination of the aircraft revealed that it had collided with natural growth pine trees about 6,000 feet msl on Hot Springs Mountain. The aircraft was commingled with tree structures and was substantially damaged but intact. According to the aircraft compass, the direction at rest was 190 degrees magnetic. MEDICAL AND PATHOLOGICAL INFORMATION On October 12, 1997, the San Diego County Medical Examiner performed an autopsy on the pilot. The cause of death was attributed to multiple blunt force trauma. During the examination samples were obtained for toxicological examination by the Federal Aviation Administration Civil Aeromedical Institute in Oklahoma City, Oklahoma. The results of the analysis were negative for all screened drugs and ethanol. ADDITIONAL INFORMATION The on-board camera was recovered closed with minor damage at the bottom mounting point. The camera was taken to a photo processor who reported that the camera had been opened and half of the film was ripped out of the camera. There were 10 pictures recovered, of which 4 were light damaged. The Safety Board did not take possession of the wreckage. ## Aircraft - Registration: [N242DB](https://openairdocs.org/deregistered/N242DB-2020-10-31), registration cancelled 2020-10-31, S/N 42, built 1966 (OpenAirDocs) - Reported make and model: Schweizer 2-32 - Registry model: [Schweizer SGS 2-32](https://openairdocs.org/model/schweizer-sgs-2-32) (registry code 8050206) (OpenAirDocs) - Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs) - Category: Glider - Serial number: 42 - Airframe hours: 6204 - Engines: unknown - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: Brett Willat - Airworthiness certificate: Standard, Utility - Last inspection: 100 hour, September 12, 1997, 42 hours before - Departed: CL35, CA ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 47; commercial; seat: front; toxicology performed; flight hours: 6,636 total, 1,500 in this make and model, 6,616 as pilot in command, 200 in the last 90 days, 49 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Instrument (IMC), Day - Wind: 240° at 10 knots - Visibility: 30 statute miles - Lowest ceiling: 3,000 ft broken - Altimeter: 29.00 inHg - Observed at: CRQ, 43 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 19971010031179A](https://openairdocs.org/incident/19971010031179A), Oct 10, 1997: Scwzer SGS232, Warner Springs, CA, Substantial damage, 1 fatal. Glider sightseeing flight strong thermals lifted to 14000FT on top. Tried descend in clouds. Struck mountainside. ## Other investigations on N242DB (1) 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. - [NTSB LAX87LA224](https://openairdocs.org/ntsb/LAX87LA224), May 30, 1987: Schweizer SGS 2-32 (N242DB), Fremont, CA, minor damage 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.