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ASN Wikibase Occurrence # 37687
Last updated: 23 September 2019
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Date:21-JAN-1995
Time:15:37
Type:Silhouette image of generic VTUR model; specific model in this crash may look slightly different
Questair Venture
Owner/operator:Questair
Registration: N4QV
C/n / msn: 43
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Des Moines, IA -   United States of America
Phase: En route
Nature:Executive
Departure airport:Palwaukee, IL (PWK)
Destination airport:Cheyenne, WY (CYS)
Investigating agency: NTSB
Narrative:
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. 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.

Sources:

NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001207X02831


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:23 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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