# N100MK: Learjet 25, registration cancelled 1997-03-06

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: March 6, 1997
- Status when cancelled: Triennial form not returned
- Airframe: [Learjet 25](https://openairdocs.org/model/learjet-25) (registry code 5170506)
- Data sheets: [TCDS A10CE](https://openairdocs.org/tcds/A10CE) (OpenAirDocs)
- Serial number: 019
- Type of aircraft: Fixed wing multi engine
- Certificate issued: August 21, 1978
- Last registry action: January 15, 1997
- Mode S code: A005D1
- Owner when cancelled: [Kelco Aircraft Co](https://openairdocs.org/faa-owner/KELCO%20AIRCRAFT%20CO)
- Location: [Cleveland, OH](https://openairdocs.org/faa-place/OH/Cleveland)
- Owner type: Corporation
- Owner's area on the map: 41.4058° N, 81.6098° W: Placed by OpenAirDocs at the center of ZIP code 44125, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N100MK
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=100MK
- Page: https://openairdocs.org/deregistered/N100MK-1997-03-06

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 Learjet 25: https://openairdocs.org/model/learjet-25.md

## 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.

- [Accident 19781020043949A](https://openairdocs.org/incident/19781020043949A), Oct 20, 1978: Lear 25 (N100MK), Vickery, OH, Destroyed. Aircraft crashed during FAA conducted flight check. Investigation indicates malfunction of servo drive unit.

## Other aircraft with N100MK

- [Cancelled 2016-08-08](https://openairdocs.org/deregistered/N100MK-2016-08-08): Keech Andrew C LW5, S/N 1, built 2000. Third renewal notice. Owner: [Eaa Aviation Foundation Inc](https://openairdocs.org/faa-owner/EAA%20AVIATION%20FOUNDATION%20INC), [Oshkosh, WI](https://openairdocs.org/faa-place/WI/Oshkosh)

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