# N51AC: 1972 Pitts S-1C, registration cancelled 2013-03-25

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: March 25, 2013
- Status when cancelled: Registration expired, pending cancellation
- Airframe: [Pitts S-1C](https://openairdocs.org/model/pitts-s-1c) (registry code 72202LS)
- Engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508)
- Data sheets: [TCDS E-274](https://openairdocs.org/tcds/E-274) (OpenAirDocs)
- Serial number: 137-H
- Year built: 1972
- Type of aircraft: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Experimental, amateur built
- Airworthiness date: June 8, 1976
- Certificate issued: September 25, 2009
- Last registry action: September 25, 2009
- Mode S code: A65F19
- Owner when cancelled: [Woltermann Cathleen A](https://openairdocs.org/faa-owner/WOLTERMANN%20CATHLEEN%20A)
- Location: [Billings, MT](https://openairdocs.org/faa-place/MT/Billings)
- Owner type: Individual
- Owner's area on the map: 45.8930° N, 108.4977° W: Placed by OpenAirDocs at the center of ZIP code 59105, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N51AC
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=51AC
- Page: https://openairdocs.org/deregistered/N51AC-2013-03-25

From the FAA registry file of October 29, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe.

ADs and bulletins for the Pitts S-1C: https://openairdocs.org/model/pitts-s-1c.md

## 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 CHI73FER04](https://openairdocs.org/ntsb/CHI73FER04), Sep 4, 1972: Pitts SPL S1C (N51AC), Osceola, WI, substantial damage

## Other aircraft with N51AC

- [Registered now](https://openairdocs.org/aircraft/N51AC): Textron 525C, S/N 525C0276, built 2018

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