# N3907A: 1973 Schweizer SGU 2-22CK - Status: Valid registration - Airframe: [Schweizer SGU 2-22CK](https://openairdocs.org/model/schweizer-sgu-2-22ck) (registry code 8050610, 2 seats) - Engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) - Data sheets: [TCDS G-18](https://openairdocs.org/tcds/G-18) (K & L Soaring LLC) (OpenAirDocs) - Serial number: 66 - Year built: 1973 - Type: Glider - Engine type: None - Airworthiness: Standard, glider - Airworthiness date: June 29, 1973 - Certificate issued: March 27, 2013 - Expires: March 31, 2029 - Mode S code: A48617 - Registered owner: [Dorman Richard E](https://openairdocs.org/faa-owner/DORMAN%20RICHARD%20E) - Location: [Mesa, WA](https://openairdocs.org/faa-place/WA/Mesa) - Owner type: Individual - Owner's area on the map: 46.5967° N, 119.1647° W: Placed by OpenAirDocs at the center of ZIP code 99343, within about 8 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=3907A - Page: https://openairdocs.org/aircraft/N3907A From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. ## ADs that may apply (OpenAirDocs): 3 in force ### Matched by airframe (Schweizer SGU 2-22CK) - [AD 87-17-01](https://openairdocs.org/ad/87-17-01): Tow Release Installation · K & L Soaring SGS 1-23, SGS 1-23D, SGS 1-23F and 25 more. Effective Aug 19, 1988 - [AD 76-13-11 R1](https://openairdocs.org/ad/76-13-11-R1): Aft Fuselage Longerons · K & L Soaring SGS 2-33, SGS 2-33A, SGU 2-22C and 3 more. Effective May 25, 1988 - [AD 87-02-01](https://openairdocs.org/ad/87-02-01): Tow-Release Installation Inspection · K & L Soaring SGM 2-37, SGS 1-23, SGS 1-23D and 32 more. Effective Jan 21, 1987 ### Matched by engine (Amateur-built UNKNOWN ENG) None in force. ## Information bulletins (advisory) None matched. ## NTSB investigations (2) 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 WPR09CA368](https://openairdocs.org/ntsb/WPR09CA368), Jul 24, 2009: Schweizer SGU 2-22CK (N3907A), Ephrata, WA, substantial damage. Probable cause: The premature launch signal given by the wing walker. - [NTSB SEA92LA172](https://openairdocs.org/ntsb/SEA92LA172), Jul 31, 1992: Schweizer SGU 2-22CK (N3907A), Ephrata, WA, substantial damage. Probable cause: THE PILOT MISJUDGED THE LANDING FLARE. FACTORS INCLUDE A LACK OF TOTAL PILOT EXPEREINCE. ## FAA accident and incident reports (1) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Accident 20090724012819A](https://openairdocs.org/incident/20090724012819A), Jul 24, 2009: Scwzer SGU222CK (N3907A), Ephrata, WA, Substantial damage. (-23) During a prematurely initiated vehicle towed glider launch wherein the vehicle driver misunderstood signals, while the flight instructor was still in the… ## Service difficulty reports None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. ## STCs that may be installed (OpenAirDocs) (6) Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do. ### Approved for the airframe (Schweizer SGU 2-22CK) - [STC SA01734SE](https://openairdocs.org/stc/SA01734SE): Application of Stewart Systems synthetic fabric covering system to aircraft fuselage, wings, tail surfaces, control surfaces and related parts. Andrew D. Humphrey - [STC SG01164CH](https://openairdocs.org/stc/SG01164CH): Install Cooper superflite 102 fabric. Aviation Products Systems Inc - [STC SA1351WE](https://openairdocs.org/stc/SA1351WE): Replace existing fabric on wings, fuselage, empennage, and/or control surfaces, with Ceconite101 material. (262A Series -12). Ceconite Inc - [STC SG10WE](https://openairdocs.org/stc/SG10WE): Replace existing fabric on wings, fuselage, empennage, and/or control surfaces with Ceconite103 material. Ceconite Inc - [STC SG4-1240](https://openairdocs.org/stc/SG4-1240): Installation of Eonnex cover on aircraft surfaces. Ceconite, Inc - [STC SG4-1411](https://openairdocs.org/stc/SG4-1411): Ceconite 103 covering of glider. Cooper Engineering Corporation ## Related - Other Schweizer SGU 2-22CK aircraft: https://openairdocs.org/model/schweizer-sgu-2-22ck/aircraft.md - The Amateur-built UNKNOWN ENG engine: https://openairdocs.org/engine/amateur-built-unknown-eng.md --- 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.