# N7640: 1970 Schweizer SGS 1-34

- Status: Valid registration
- Airframe: [Schweizer SGS 1-34](https://openairdocs.org/model/schweizer-sgs-1-34) (registry code 8050146, 1 seats)
- Engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000)
- Data sheets: [TCDS G3EA](https://openairdocs.org/tcds/G3EA) (K & L Soaring LLC) (OpenAirDocs)
- Serial number: 20
- Year built: 1970
- Type: Glider
- Engine type: None
- Airworthiness: Standard, glider
- Airworthiness date: March 20, 1970
- Certificate issued: May 13, 2021
- Expires: May 31, 2028
- Mode S code: AA52BC
- Registered owner: [Silent Knights Inc](https://openairdocs.org/faa-owner/SILENT%20KNIGHTS%20INC)
- Location: [Ankeny, IA](https://openairdocs.org/faa-place/IA/Ankeny)
- Owner type: Corporation
- Owner's area on the map: 41.7266° N, 93.6308° W: Placed by OpenAirDocs at the center of ZIP code 50023, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=7640
- Page: https://openairdocs.org/aircraft/N7640

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 1-34)

- [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

None matched to N7640.

## 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.

- [Incident 20050806025589I](https://openairdocs.org/incident/20050806025589I), Aug 6, 2005: Scwzer SGS134 (N7640), Dansville, NY, Minor damage. (-23) On Saturday, August 6, 2005, on rollout from landing, the right wing of a Schweizer glider, N7640, contacted the left wingtip of citabra N7591F which was…

## 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) (1)

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 1-34)

- [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

## Earlier aircraft with N7640

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N7640 before.

- [Cancelled 1930-07-23](https://openairdocs.org/deregistered/N7640-1930-07-23): Standard J-1, S/N MAC-21, built 1917. Owner: [Henderson Roy M And Hilstrom Hollis R](https://openairdocs.org/faa-owner/HENDERSON%20ROY%20M%20AND%20HILSTROM%20HOLLIS%20R), [Scranton, IA](https://openairdocs.org/faa-place/IA/Scranton)

## Related

- Other Schweizer SGS 1-34 aircraft: https://openairdocs.org/model/schweizer-sgs-1-34/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.