# NTSB ANC07LA046: Schleicher ASK-21, N621CP, Clear, AK, June 9, 2007 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 9, 2007, 10:04 local (18:04 UTC) - Place: Clear, AK - Coordinates: 64.301109, -149.120285 - Nearby events: https://openairdocs.org/map.md?lat=64.3011&lon=-149.1203&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report November 29, 2007 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: FAA Fairbanks FSDO-01 - NTSB case key (mKey): 65961 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC07LA046 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/65961/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=65961 - Page: https://openairdocs.org/ntsb/ANC07LA046 ## Probable cause The dual student's misjudged distance/altitude during the final approach to land, and the flight instructor's inadequate supervision of the student, which resulted in an undershoot, and substantial damage. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Undershoot, approach - vfr pattern - final approach - distance/altitude - misjudged, dual student (cause) - supervision - inadequate, pilot in command(cfi) (cause) - In flight collision with terrain/water, approach - vfr pattern - final approach - terrain condition - runway ## Analysis The flight instructor was conducting student training in the airport traffic pattern under Title 14, CFR Part 91. On short final the dual student deployed full spoilers, resulting in the glider touching down short of the runway. The nose wheel of the glider impacted the edge of the runway threshold, damaging the landing gear attachment and the fuselage. ## Factual narrative On June 9, 2007, about 1004 Alaska daylight time, a Schleicher ASK-21 glider, N621CP, sustained substantial damage when it landed short of the runway at the Clear Airport, Clear, Alaska. The airplane was being operated by Civil Air Patrol Inc, Fairbanks, Alaska, as a visual flight rules (VFR) instructional flight under Title 14, CFR Part 91, when the accident occurred. The flight instructor and student pilot were not injured. Visual meteorological conditions prevailed, and no flight plan was filed. In a written statement to the National Transportation Safety Board (NTSB) dated July 13, the instructor wrote that he was providing instruction to the student pilot, and that on short final the student deployed full spoilers causing the glider to touch down short of the runway threshold. He wrote that the nose wheel impacted the leading edge of the runway, which damaged the nose wheel mount and fiberglass fuselage. According to the pilot, there were no known mechanical anomalies with the glider prior to the accident. ## Aircraft - Registration: [N621CP](https://openairdocs.org/aircraft/N621CP), registered now, S/N 21708, built 2000 (OpenAirDocs) - Reported make and model: Schleicher ASK-21 - Registry model: [Schleicher ASK-21](https://openairdocs.org/model/schleicher-ask-21) (registry code 38015GY) (OpenAirDocs) - Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs) - Category: Glider - Serial number: 21708 - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Civil Air Patrol Inc - Registered owner: Civil Air Patrol Inc. - Airworthiness certificate: Standard, Normal - Departed: PACL, Clear, AK - Airport: PACL, Clear, runway 01, 4,000 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 68; injuries: none; flight instructor, commercial; airplane ratings: single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review March 1, 2006; seat: rear; flight hours: 5,481 total, 60 in this make and model, 5,340 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 70 °F ## 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 20070609010899A](https://openairdocs.org/incident/20070609010899A), Jun 9, 2007: Schler ASK21, Clear, AK, Substantial damage. (-23) This accident occurred during an airforce funded cadet training exercise. By definition an airforce mission (#A-20). The glider landed short of rwy 01 on… ## Docket (1 files) The files NTSB released with the investigation on October 22, 2007, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=65961. 292 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 292 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40284257&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF 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.