# N15536: 1938 Security National Acft S1-B

- Status: Valid registration
- Airframe: [Security National Acft S1-B](https://openairdocs.org/model/security-national-acft-s1-b) (registry code 0620304, 2 seats)
- Engine: [American S5-125](https://openairdocs.org/engine/american-s5-125) (registry code 04001)
- Data sheets: [TCDS TC 181](https://openairdocs.org/tcds/TC%20181) (American Aircraft Company) (OpenAirDocs)
- Serial number: 28
- Year built: 1938
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard
- Airworthiness date: May 15, 1940
- Certificate issued: December 11, 1997
- Expires: April 30, 2029
- Mode S code: A0DFA2
- Registered owner: [California Antique Aircraft Museum](https://openairdocs.org/faa-owner/CALIFORNIA%20ANTIQUE%20AIRCRAFT%20MUSEUM)
- Location: [San Martin, CA](https://openairdocs.org/faa-place/CA/San%20Martin)
- Owner type: Corporation
- Owner's area on the map: 37.0993° N, 121.5992° W: Placed by OpenAirDocs at the center of ZIP code 95046, 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=15536
- Page: https://openairdocs.org/aircraft/N15536

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 (Security National Acft S1-B)

None in force.

### Matched by engine (American S5-125)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N15536.

## FAA accident and incident reports

None matched to N15536.

## 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 engine (American S5-125)

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC

## Earlier aircraft with N15536

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N15536 before.

- [Cancelled 1956-02-01](https://openairdocs.org/deregistered/N15536-1956-02-01): American S1-B, S/N 28. Owner: [Smith William R](https://openairdocs.org/faa-owner/SMITH%20WILLIAM%20R), [Spring Valley, CA](https://openairdocs.org/faa-place/CA/Spring%20Valley)

## Related

- Other Security National Acft S1-B aircraft: https://openairdocs.org/model/security-national-acft-s1-b/aircraft.md
- The American S5-125 engine: https://openairdocs.org/engine/american-s5-125.md

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