# N1937: 1937 Waco YKS-7

- Status: Valid registration
- Airframe: [Waco YKS-7](https://openairdocs.org/model/waco-yks-7) (registry code 9600835, 5 seats)
- Engine: [Jacobs L4 /R755-7](https://openairdocs.org/engine/jacobs-l4-r755-7) (registry code 35003)
- Data sheets: [TCDS TC 626](https://openairdocs.org/tcds/TC%20626) (The Waco Aircraft Company) (OpenAirDocs)
- Serial number: 4631
- Year built: 1937
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard
- Airworthiness date: May 21, 1956
- Certificate issued: August 22, 2018
- Expires: August 31, 2028
- Mode S code: A1769D
- Registered owner: [Nichols Charles F Trustee](https://openairdocs.org/faa-owner/NICHOLS%20CHARLES%20F%20TRUSTEE)
- Location: [Baldwin Park, CA](https://openairdocs.org/faa-place/CA/Baldwin%20Park)
- Owner type: Individual
- Owner's area on the map: 34.0974° N, 117.9683° W: Placed by OpenAirDocs at the center of ZIP code 91706, 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=1937
- Page: https://openairdocs.org/aircraft/N1937

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): 0 in force

### Matched by airframe (Waco YKS-7)

None in force.

### Matched by engine (Jacobs L4 /R755-7)

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 DEN69F0067](https://openairdocs.org/ntsb/DEN69F0067), Jul 23, 1968: Waco YKS-7 (N1937), Albuquerque, NM, substantial damage

## FAA accident and incident reports

None matched to N1937.

## 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) (10)

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 (Waco YKS-7)

- [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC
- [STC SA01757WI](https://openairdocs.org/stc/SA01757WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel. Swift Fuels LLC
- [STC SA4503NM](https://openairdocs.org/stc/SA4503NM): Remove original cloth covering and install Ceconite covering. Ceconite Division of Poly-Fiber Inc
- [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc
- [STC SA01406NY](https://openairdocs.org/stc/SA01406NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K017 on single and multi-engine fixed light aircraft and rotary wing. Airwolf Filter Corporation
- [STC SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories. Electronics International Inc
- [STC SA02033AT](https://openairdocs.org/stc/SA02033AT): Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line. M-20 Oil Separators LLC
- [STC SA2350NM PAGE 2](https://openairdocs.org/stc/SA2350NM%20PAGE%202): Installation of Electronics International Inc digital carburetor/outside air temperature gauges. Electronics International
- [STC SA2190NM PAGE 2](https://openairdocs.org/stc/SA2190NM%20PAGE%202): Installation of electronics International Digital Volt/Amp Gauges and Accessories. Electronics International
- [STC SA2350NM](https://openairdocs.org/stc/SA2350NM) (historical): Installation of Electronics International Inc digital carburetor/outside air temperature gauges listed on the attached continuation sheet and the associated accessories. Electronics International

## Earlier aircraft with N1937

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N1937 before.

- [Cancelled 1948-11-22](https://openairdocs.org/deregistered/N1937-1948-11-22): Taylorcraft A, S/N 310, built 1937. Owner: [Tehnert Burley E](https://openairdocs.org/faa-owner/TEHNERT%20BURLEY%20E), [Phoenix, AZ](https://openairdocs.org/faa-place/AZ/Phoenix)

## Related

- Other Waco YKS-7 aircraft: https://openairdocs.org/model/waco-yks-7/aircraft.md
- The Jacobs L4 /R755-7 engine: https://openairdocs.org/engine/jacobs-l4-r755-7.md

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