# N9980: Jacob Robert Lanford SLING 4 TSI

- Status: Valid registration
- Airframe: [Jacob Robert Lanford SLING 4 TSI](https://openairdocs.org/model/jacob-robert-lanford-sling-4-tsi) (registry code 05643U3, 4 seats)
- Serial number: 633SK
- Type: Fixed wing single engine
- Engine type: 4 cycle
- Kit: Airplane Factory Inc SLING TSI
- Certificate issued: July 1, 2026
- Expires: July 31, 2033
- Mode S code: ADF2B3
- Registered owner: [Lanford Jacob](https://openairdocs.org/faa-owner/LANFORD%20JACOB)
- Location: [Monkton, MD](https://openairdocs.org/faa-place/MD/Monkton)
- Owner type: Individual
- Owner's area on the map: 39.5755° N, 76.5896° W: Placed by OpenAirDocs at the center of ZIP code 21111, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=9980
- Page: https://openairdocs.org/aircraft/N9980

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 (Jacob Robert Lanford SLING 4 TSI)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N9980.

## NTSB investigations on N9980 not matched to an aircraft (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 CHI68F0590](https://openairdocs.org/ntsb/CHI68F0590), Feb 15, 1968: Erco 415-D (N9980), Speedway, IN, substantial damage

## FAA accident and incident reports

None matched to N9980.

## 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)

None matched to this aircraft's models.

## Earlier aircraft with N9980

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N9980 before.

- [Cancelled 1981-10-13](https://openairdocs.org/deregistered/N9980-1981-10-13): Beech C-45, S/N 39980. Owner: [Montcalm Community College](https://openairdocs.org/faa-owner/MONTCALM%20COMMUNITY%20COLLEGE), [Sidney, MI](https://openairdocs.org/faa-place/MI/Sidney)
- [Cancelled 1931-07-28](https://openairdocs.org/deregistered/N9980-1931-07-28): Travel Air S-6000-B, S/N 1076. Owner: [Oakland Airways Ltd](https://openairdocs.org/faa-owner/OAKLAND%20AIRWAYS%20LTD), [Berkeley, CA](https://openairdocs.org/faa-place/CA/Berkeley)

## Related

- Other Jacob Robert Lanford SLING 4 TSI aircraft: https://openairdocs.org/model/jacob-robert-lanford-sling-4-tsi/aircraft.md

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