Experimental aircraft has crankshaft sever. Emergency landing.

Attributes
ACN	163742
Time
Date	199011
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 10 flight time total : 375 flight time type : 165
ASRS Report	163742
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

While at cruise at 3000' MSL, crankshaft severed, propeller and hub unit struck left wing. Emergency landing followed. Suspected cause had a propeller strike 25 hours earlier. (This is a non certificated engine in an experimental aircraft). Removed shaft for alignment check. Was found out of alignment, was corrected. Shaft crack could have developed at that time. In the future will have all suspect shafts magnafluxed.

Original NASA ASRS Text

Title: EXPERIMENTAL ACFT HAS CRANKSHAFT SEVER. EMERGENCY LNDG.

Narrative: WHILE AT CRUISE AT 3000' MSL, CRANKSHAFT SEVERED, PROP AND HUB UNIT STRUCK L WING. EMER LNDG FOLLOWED. SUSPECTED CAUSE HAD A PROP STRIKE 25 HRS EARLIER. (THIS IS A NON CERTIFICATED ENG IN AN EXPERIMENTAL ACFT). REMOVED SHAFT FOR ALIGNMENT CHK. WAS FOUND OUT OF ALIGNMENT, WAS CORRECTED. SHAFT CRACK COULD HAVE DEVELOPED AT THAT TIME. IN THE FUTURE WILL HAVE ALL SUSPECT SHAFTS MAGNAFLUXED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.