# N7547: 1970 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: 177 - Year built: 1970 - Type: Glider - Engine type: None - Airworthiness: Standard, glider - Airworthiness date: April 14, 1970 - Certificate issued: July 22, 2004 - Expires: October 31, 2027 - Mode S code: AA2C32 - Registered owner: [Sky Sailing Inc](https://openairdocs.org/faa-owner/SKY%20SAILING%20INC) - Location: [Warner Springs, CA](https://openairdocs.org/faa-place/CA/Warner%20Springs) - Owner type: Corporation - Owner's area on the map: 33.3244° N, 116.6270° W: Placed by OpenAirDocs at the center of ZIP code 92086, 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=7547 - Page: https://openairdocs.org/aircraft/N7547 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 (3) 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 WPR20CA273](https://openairdocs.org/ntsb/WPR20CA273), Aug 14, 2020: Schweizer SGS233 (N7547), Warner Springs, CA, substantial damage. Probable cause: The pilot's inability to maintain altitude due to a loss of thermal lift, which resulted in an off-airport landing. - [NTSB LAX83LA145](https://openairdocs.org/ntsb/LAX83LA145), Mar 7, 1983: Schweizer SGS2-33A (N7547), Fremont, CA, minor damage - [NTSB OAK73DVD27](https://openairdocs.org/ntsb/OAK73DVD27), Mar 20, 1973: Schweizer SGS233 (N7547), Fremont, CA, substantial damage ## FAA accident and incident reports (3) 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 20200814013629A](https://openairdocs.org/incident/20200814013629A), Aug 14, 2020: Schweizer SGS 2-33A (N7547), Warner Springs, CA, Substantial damage. Glider pilot had normal take off and released the glider over hot spring at approximately 63OO feet MSL. After that pilot gained some more altitude and headed… - [Accident 19830306008359A](https://openairdocs.org/incident/19830306008359A), Mar 6, 1983: Scwzer SGS233A (N7547), Fremont Sky Sai, CA, Minor damage. Glider pilot swerved off runway into muddy area during take off. Glider lifted off then slammed back into ground. - [Accident 19730320007489A](https://openairdocs.org/incident/19730320007489A), Mar 20, 1973: Scwzer SGS233A (N7547), Fremont, CA, Substantial damage. Flipped over prior to tkof roll. ## 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.