# N65818: 1973 Schweizer SGS 2-33A - Status: Valid registration - Airframe: [Schweizer SGS 2-33A](https://openairdocs.org/model/schweizer-sgs-2-33a) (registry code 8051606, 2 seats) - Engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000) - Data sheets: [TCDS G2EA](https://openairdocs.org/tcds/G2EA) (K & L Soaring LLC) (OpenAirDocs) - Serial number: 303 - Year built: 1973 - Type: Glider - Engine type: None - Airworthiness: Standard, glider - Airworthiness date: October 10, 1973 - Certificate issued: November 14, 2020 - Expires: November 30, 2027 - Mode S code: A8AD0E - Registered owners: [Helgersen William A Sr](https://openairdocs.org/faa-owner/HELGERSEN%20WILLIAM%20A%20SR), [Helgersen Helen E](https://openairdocs.org/faa-owner/HELGERSEN%20HELEN%20E) - Location: [Mokena, IL](https://openairdocs.org/faa-place/IL/Mokena) - Owner type: Partnership - Owner's area on the map: 41.5378° N, 87.8926° W: Placed by OpenAirDocs at the center of ZIP code 60448, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=65818 - Page: https://openairdocs.org/aircraft/N65818 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): 4 in force ### Matched by airframe (Schweizer SGS 2-33A) - [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 - [AD 77-23-10](https://openairdocs.org/ad/77-23-10): Spar Web and Bolts · K & L Soaring SGS 2-33, SGS 2-33A and SGS 2-33AK. Effective Jun 21, 1978 ### Matched by engine (NONE) 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 CEN25LA311](https://openairdocs.org/ntsb/CEN25LA311), Aug 6, 2025: Schweizer SGS 2-33A (N65818), Monee, IL, substantial damage. Probable cause: The student pilot’s failure to maintain airspeed and altitude resulting in a collision with the ground during the base to final turn. - [NTSB BFO85LA053](https://openairdocs.org/ntsb/BFO85LA053), Jul 7, 1985: Schweizer 2-33A (N65818), Warrenton, VA, substantial damage ## FAA accident and incident reports (2) 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 20250806012719A](https://openairdocs.org/incident/20250806012719A), Aug 6, 2025: Schweizer SGS 2-33A (N65818), Monee, IL, Substantial damage. On August 6th, 2025 at approximately 05:19 pm CDT, a student pilot was operating a Schweizer sgs 2-33 glider in the vicinity of bult field, C56 on a solo… - [Accident 19850707034609A](https://openairdocs.org/incident/19850707034609A), Jul 7, 1985: Scwzer SGS233A (N65818), Warrenton, VA, Substantial damage. Turbulence on tow. At 200 ft AGL rope separated from tow plane. Glider crash landed. No defects in tow release. ## 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) (4) 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 SGS 2-33A) - [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 SG1186GL](https://openairdocs.org/stc/SG1186GL): Surrendered and incorporated into STC SG01164CH. Cooper Aviation Supply Company, Inc - [STC SG305GL](https://openairdocs.org/stc/SG305GL): Install full swivel tail wheel, Cronig P/N SK-1, utilizing existing mounting points, bolts and hardware. Cronig Alvin ## Related - Other Schweizer SGS 2-33A aircraft: https://openairdocs.org/model/schweizer-sgs-2-33a/aircraft.md - The NONE engine: https://openairdocs.org/engine/none.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.