# Accident 19900130001369A: Bolkms BK117A1, Janesville, WI, January 30, 1990

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: January 30, 1990, 13:10 local time
- Place: Janesville, WI
- Damage: Substantial damage
- Phase of flight: Pwr Off Vert Land/Autorotate
- Operating rules: General operating rules (Part 91)
- Operator: AYUA
- Location: 42.6797° N, 89.0091° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=42.6797&lon=-89.0091&mi=10
- Aircraft: N117M, a cancelled registration (https://openairdocs.org/deregistered/N117M-2013-02-22) (OpenAirDocs)
- Registry model: MBB BK 117 A-3 (registry code 5626015, https://openairdocs.org/model/mbb-bk-117-a-3) (OpenAirDocs)
- Reported make and model: BOLKMS BK117A1
- Reported engine: LYC LTS101650B1
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 5,869 total, 62 in this make and model, 78 in the last 90 days
- NTSB investigation: [NTSB CHI90LA074](https://openairdocs.org/ntsb/CHI90LA074) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19900130001369A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

ENGINE COWLING CAME LOOSE ON TEST FLIGHT. EMERGENCY LANDING DUE TO DAMAGED ROTORS.

## The NTSB's investigation of this event (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 CHI90LA074](https://openairdocs.org/ntsb/CHI90LA074), Jan 30, 1990: MBB BK-117A-1 (N117M), Janesville, WI, substantial damage. Probable cause: THE PILOT-IN-COMMAND FAILED TO ENSURE THAT THE ENGINE COWLING LATCHES WERE PROPERLY SECURED PRIOR TO DEPARTING ON THE MAINTENANCE TEST FLIGHT; THE COWLING CAME LOOSE DURING FLIGHT, AND CONTACTED THE…

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. For accidents, the NTSB's own investigation is the fuller record.

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