# N7798R: 1998 Underland/Grothe/Finstrom MMII (MUSTANG II), registration cancelled 2013-08-13

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: August 13, 2013
- Status when cancelled: Sale reported, canceled
- Airframe: [Underland/Grothe/Finstrom MMII (MUSTANG II)](https://openairdocs.org/model/underland-grothe-finstrom-mmii-mustang-ii) (registry code 05605N6)
- Engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515)
- Data sheets: [TCDS 1E10](https://openairdocs.org/tcds/1E10) (OpenAirDocs)
- Serial number: 428R
- Year built: 1998
- Type of aircraft: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Experimental, amateur built
- Airworthiness date: April 23, 1999
- Last registry action: March 23, 2010
- Mode S code: AA8DF6
- Location: [Minneapolis, MN](https://openairdocs.org/faa-place/MN/Minneapolis)
- Owner type: Individual
- Owner's area on the map: 44.9350° N, 93.2530° W: Placed by OpenAirDocs at the center of ZIP code 55407, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N7798R
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=7798R
- Page: https://openairdocs.org/deregistered/N7798R-2013-08-13

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 Underland/Grothe/Finstrom MMII (MUSTANG II): https://openairdocs.org/model/underland-grothe-finstrom-mmii-mustang-ii.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 ERA09CA495](https://openairdocs.org/ntsb/ERA09CA495), Aug 29, 2009: Underland/Grothe/Finstrom Mmii (Must (N7798R), Lantana, FL, substantial damage. Probable cause: The delay by both pilots to abort the takeoff resulting in a runway overrun. Contributing to the accident was the unintentional forward movement of the pilot's seat resulting in interference with the…

## 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 20090829048689A](https://openairdocs.org/incident/20090829048689A), Aug 29, 2009: Underland/G MMII (MUSTA (N7798R), Lantana, FL, Substantial damage. During take off rotation on runway 15, the pilot noticed that the aircraft seat moved forward restricting the flight control stick from being moved rearward to…

## Other aircraft with N7798R

- [Cancelled 1976-02-23](https://openairdocs.org/deregistered/N7798R-1976-02-23): Beech V35A, S/N D-8895. Owner: [Watts Looney Nichols & Johnson Inc](https://openairdocs.org/faa-owner/WATTS%20LOONEY%20NICHOLS%20%26%20JOHNSON%20INC), [Oklahoma City, OK](https://openairdocs.org/faa-place/OK/Oklahoma%20City)

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