# N4KX: 1972 Berkshire Mfg. CONCEPT 70, registration cancelled 1975-11-14

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: November 14, 1975
- Status when cancelled: Valid registration
- Airframe: [Berkshire Mfg. CONCEPT 70](https://openairdocs.org/model/berkshire-mfg-concept-70) (registry code 1240104)
- Serial number: 4
- Year built: 1972
- Type of aircraft: Glider
- Certificate issued: July 12, 1975
- Mode S code: A4A8E6
- Owner when cancelled: [Whelan Robert](https://openairdocs.org/faa-owner/WHELAN%20ROBERT)
- Location: [Salt Lake City, UT](https://openairdocs.org/faa-place/UT/Salt%20Lake%20City)
- Owner type: Individual
- The mark today: https://openairdocs.org/aircraft/N4KX
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4KX
- Page: https://openairdocs.org/deregistered/N4KX-1975-11-14

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 Berkshire Mfg. CONCEPT 70: https://openairdocs.org/model/berkshire-mfg-concept-70.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 DEN76FTM07](https://openairdocs.org/ntsb/DEN76FTM07), Sep 20, 1975: Berkshire 70 (N4KX), Heber City, UT, destroyed

## Other aircraft with N4KX

- [Registered now](https://openairdocs.org/aircraft/N4KX): Cessna 180K, S/N 18052816, built 1977

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