# NTSB LAX05CA161: Schempp-Hirth Discus 2b, N15MM, Peoria, AZ, May 9, 2005 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: May 8, 2005, 17:00 local (May 9, 2005, 00:00 UTC) - Place: Peoria, AZ - Coordinates: 33.924999, -112.309997 - Nearby events: https://openairdocs.org/map.md?lat=33.9250&lon=-112.3100&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report September 13, 2005 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 61450 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX05CA161 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/61450/pdf - Page: https://openairdocs.org/ntsb/LAX05CA161 ## Probable cause the glider pilot encountered a downdraft that forced him to land in rough terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight encounter with weather, descent - weather condition - downdraft (cause) - Forced landing, emergency descent/landing - On ground/water encounter with terrain/water, landing - altitude - inadequate - terrain condition - rough/uneven - precautionary landing - not successful, pilot in command ## Analysis The glider was damaged during a forced landing 1.5 miles south of the landing strip in rocky desert terrain. The pilot was on a circular cross-country flight designed to depart, and then return to the same airport. Along the route there were numerous navigation turn points to maintain a proper track on the course. About 250 miles into the flight, and at the second to last turn point, the pilot determined that he did not have enough altitude to make it to the last turn point before heading back to the airport. His flight computer indicated that he had enough altitude to go directly to the destination airport with a 1,000-foot altitude margin. While returning he encountered some downward subsiding air of about 7-8 knots (700-800 feet per minute downdraft). At this point he determined that he would not make it to the destination airport and decided to divert to an auxiliary dirt landing strip to make a precautionary landing. The pilot did not make it all the way to the auxiliary strip and landed about 1.5 miles south, in rocky desert terrain. The pilot stated that the glider had no mechanical failures or malfunctions during the flight. ## Factual narrative On May 8, 2005, at 1700 mountain standard time, a Schempp-Hirth Discus 2b glider, N15MM, was damaged during an encounter with rough terrain during a forced landing 10 miles north of Pleasant Valley Airport, Peoria, Arizona. The owner operated the glider under the provisions of 14 CFR Part 91. The glider rated private pilot was not injured, and the glider was substantially damaged. Visual meteorological conditions prevailed, and no flight plan had been filed. The flight originated at the Pleasant Valley Airport. The pilot stated to the National Transportation Safety Board investigator that he was on a circular cross-country flight designed to depart and then return to the Pleasant Valley Airport. Along the route there were numerous navigation "turn points." The pilot said that about 250 miles into the flight, and at the second to last turn point, Black Canyon City, he determined that he did not have enough altitude to make it to the last turn point before heading back to Pleasant Valley. His flight computer indicated that he had enough altitude to make it to Pleasant Valley Airport with a 1,000-foot altitude margin. While on the return leg he encountered some "downward subsiding air" of about 7-8 knots (700-800 feet per minute downdraft). At this point he determined that he would not make it to Pleasant Valley, and decided to divert to an auxiliary dirt landing strip (N33:57.13, W112:18.35) to make a precautionary landing. The pilot did not make it all the way to the auxiliary strip and landed about 1.5 miles south, in rocky desert terrain. The pilot stated that the glider had no mechanical failures or malfunctions during the flight. ## Aircraft - Registration: N15MM (not matched to a registry record) - Reported make and model: Schempp-Hirth Discus 2b - Category: Glider - Serial number: 129 - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: John H Weber - Registered owner: John H Weber - Airworthiness certificate: Special, Experimental (Special) - Departed: KP48, Peoria, AZ - Destination: KP48, Peoria, AZ - Airport: KP48, Pleasant Valley ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 56; private; flight hours: 1,052 total, 310 in this make and model, 49 in the last 90 days, 19 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles - Lowest ceiling: none ## 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 20050508012709A](https://openairdocs.org/incident/20050508012709A), May 8, 2005: Schemp DISCUS2B, Peoria, AZ, Substantial damage. (-23) The schempp-hirth discus 2B glider landed short of the airport during a round-robin cross country flight. The pilot stated that he encountered a… 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.