ASN Wikibase Occurrence # 37687
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| Date: | Saturday 21 January 1995 |
| Time: | 16:37 LT |
| Type: |  Questair Venture |
| Owner/operator: | Questair, Inc. |
| Registration: | N4QV |
| MSN: | 43 |
| Engine model: | H BOULEY(PMA) PMA-550-TTV |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Des Moines, IA -
 United States of America
|
| Phase: | Unknown |
| Nature: | Executive |
| Departure airport: | Palwaukee, IL (KPWK) |
| Cheyenne, WY (KCYS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PRIVATE PILOT DECLARED AN EMERGENCY WHILE AT 16,000 FEET IN VFR CONDITIONS OVERHEAD THE 9,000 FOOT RUNWAY. DURING THE DESCENT HE STATED HIS ENGINE RAN ROUGH, THEN SMOOTHED OUT. APPROXIMATELY 4,000 FT AGL HE STATED HE 'HAD A MAJOR PROBLEM...COMING DOWN.' WITNESSES DESCRIBED THE AIRPLANE IN A STEEP DESCENT, THEN ENTERING A SPIN AT APPROXIMATELY 1,000 FT AGL. THE AIRPLANE IMPACTED 3/4 MILE SHORT OF THE RUNWAY. TESTING REVEALED THE CRANKSHAFT FAILED IN 2 PLACES, BOTH WITH AREAS OF FATIGUE CRACKING. THE FATIGUE ORIGIN WAS SUBSURFACE, THE SHAFT WAS MACHINED, NOT FORGED, AND HAD AN ESTIMATED 150 TO 200 HOURS IN OPERATION. NO OTHER DISCREPANCIES WERE FOUND WITH THE AIRPLANE.
Probable Cause: The pilot's failure to maintain aircraft control during the emergency descent, resulting in a stall/spin. Factors were material defects in the material used to manufacture the crankshaft, resulting in the crankshaft fracturing after approximately 200 hours in service.
Accident investigation:
 |
|
Sources:
NTSB CHI95FA071
History of this aircraft
Other occurrences involving this aircraft
| 7 August 1992 | N95U | Condomonium Spec Ins. | 0 | Boca Raton, FL | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 16:55 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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