# N633S: 1975 Schweizer SGS 1-26E

- Status: Valid registration
- Airframe: [Schweizer SGS 1-26E](https://openairdocs.org/model/schweizer-sgs-1-26e) (registry code 8050124, 1 seats)
- Engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000)
- Data sheets: [TCDS 1G10](https://openairdocs.org/tcds/1G10) (K & L Soaring LLC) (OpenAirDocs)
- Serial number: 633
- Year built: 1975
- Type: Glider
- Engine type: None
- Airworthiness: Standard
- Airworthiness date: October 8, 2003
- Certificate issued: September 28, 2006
- Expires: April 30, 2028
- Mode S code: A84A71
- Registered owner: [Mize Darrell C](https://openairdocs.org/faa-owner/MIZE%20DARRELL%20C)
- Location: [Snyder, TX](https://openairdocs.org/faa-place/TX/Snyder)
- Owner type: Individual
- Owner's area on the map: 32.7136° N, 100.9119° W: Placed by OpenAirDocs: center of Snyder, TX, 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=633S
- Page: https://openairdocs.org/aircraft/N633S

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): 2 in force

### Matched by airframe (Schweizer SGS 1-26E)

- [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 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 (NONE)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations (1)

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 LAX05LA171](https://openairdocs.org/ntsb/LAX05LA171), May 14, 2005: Schweizer SGS 1-26E (N633S), Jean, NV, substantial damage. Probable cause: the pilot's in-flight decision to continue a flight with weak thermal lift activity, and his delayed recognition of a loss of altitude while attempting to find a thermal in which to soar. A factor in…

## 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 20050514009169A](https://openairdocs.org/incident/20050514009169A), May 14, 2005: Scwzer SGS126E (N633S), Jean, NV, Substantial damage. (-23) The aircraft operated beyond gliding distance range about 6-miles west of Jean Airport (0L7) and made an emergency/hard landing on rocky and uneven…

## 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 1-26E)

- [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 SG1265GL](https://openairdocs.org/stc/SG1265GL): Surrendered and incorporated into STC SG01164CH. Cooper Aviation Supply Company, Inc
- [STC SG4WE](https://openairdocs.org/stc/SG4WE): Ceconite 101 covering of complete aircraft. Cooper Engineering Corporation. Lists SGS 1-26 Series

## Related

- Other Schweizer SGS 1-26E aircraft: https://openairdocs.org/model/schweizer-sgs-1-26e/aircraft.md
- The NONE engine: https://openairdocs.org/engine/none.md

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