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| Date: | Friday 9 February 1990 |
| Time: | 12:14 LT |
| Type: |  Mitsubishi MU-2B-60 Marquise |
| Owner/operator: | Aeromedical Services Intl |
| Registration: | N64MD |
| MSN: | 747SA |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 4382 hours |
| Engine model: | GARRETT TPE-331-10 |
| Fatalities: | Fatalities: 1 / Occupants: 4 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Rapid City Regional (RAP), SD -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Unknown |
| Departure airport: | (KRAP) |
| Manitoba, CANADA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WITNESSES RPRTD THAT SHORTLY AFTER LIFT-OFF, THE ACFT ENTERED AN UNUSUALLY STEEP, NOSE HIGH ATTITUDE, WHILE STILL AT LOW AIRSPEED. ONE WITNESS (AN ATP PLT) RPRTD THE ACFT ATTAINED AN ALT OF APRX 75 TO 100 FT AND APPEARED TO SLOW DOWN AND ENTER A VMC ROLL, THEN IT CRASHED. IMPACT OCCURRED IN AN INVERTED, NOSE DOWN ATTITUDE, LEFT OF THE RWY. AN INVESTIGATION REVEALED THAT A COUPLING SHAFT (PN 865888-3) HAD FAILED IN THE LEFT ENG & THE LEFT PROP HAD FEATHERED. A METALLURICAL EXAM OF THE COUPLING SHOWED EVIDENCE OF FATIGUE.
Probable Cause: FAILURE OF THE PILOT TO MAINTAIN ADEQUATE AIRSPEED (VMC), WHICH RESULTED IN A LOSS OF AIRCRAFT CONTROL. A FACTOR RELATED TO THE ACCIDENT WAS: FATIGUE FAILURE OF A COUPLING SHAFT IN THE #1 ENGINE, WHICH RESULTED IN LOSS OF POWER IN THAT ENGINE.
Accident investigation:
 |
|
Sources:
NTSB DEN90FA055
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 04-Mar-2016 21:34 | Dr.John Smith | Updated [Time, Operator, Location, Nature, Departure airport, Destination airport, Source, Narrative, ] |
| 04-Mar-2016 21:38 | Dr.John Smith | Updated [Narrative, ] |
| 04-Mar-2016 21:38 | Dr.John Smith | Updated [Location, ] |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency, ] |
| 04-Aug-2017 08:40 | TB | Updated [Location, Source, Damage, ] |
| 13-Apr-2025 18:10 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative, Category, Accident report, ] |
Corrections or additions? ... Edit this accident description
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