Accident Gyroflug SC01 B-160 Speed Canard N3412L, Sunday 10 June 1990
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Date:Sunday 10 June 1990
Time:08:15
Type:Silhouette image of generic SC01 model; specific model in this crash may look slightly different    
Gyroflug SC01 B-160 Speed Canard
Owner/operator:Litton Applied Technology
Registration: N3412L
MSN: S-46
Total airframe hrs:139 hours
Engine model:LYCOMING O-320-D1A
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Destroyed
Category:Accident
Location:Mineral Wells, TX -   United States of America
Phase: Approach
Nature:Unknown
Departure airport:
Destination airport:
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
THE AIRPLANE HAD BEEN MODIFIED TO BE FLOWN EITHER REMOTELY OR BY THE PILOT. TAKEOFF AND INITIAL CLIMB WERE PERFORMED BY REMOTE CONTROL AND CONTROL WAS TRANSFERRED TO THE PILOT TO POSITION FOR A REMOTE CONTROL LANDING. ANGLE OF BANK INCREASED PAST 90 DEGREES IN A NOSE HIGH ATTITUDE AT ABOUT 425 FEET AGL; THE PILOT TRANSMITTED THAT HE WAS 'GOING DOWN' SHORTLY BEFORE IMPACT. ONE OF THE THREE WOODEN PROPELLER BLADES SEPARATED FROM THE HUB AND WAS FOUND 1/4 MILE FROM THE MAIN WRECKAGE. THE BLADE WAS ATTACHED TO THE HUB PRIMARILY BY 5 LAG SCREWS. THREADS IN THE WOOD BUTT OF THE SEPARATED BLADE WERE STRIPPED. THE 5 SCREWS REMAINED IN PLACE. LAG SCREWS IN THE REMAINING 2 BLADES WERE FOUND UNDERTORQUED. SEVERAL DISCREPANCIES WERE NOTED REGARDING SPECIFICATIONS FOR PROPELLER BLADE ROOT AND SIZE, TOLERANCES, AND LAG SCREWS. CAUSE: TOTAL PROPELLER BLADE RETENTION FAILURE, THE RESULTANT SEPARATION OF ONE PROPELLER BLADE, AND THE IMPROPER INSTALLATION OF THE PROPELLER BY UNKNOWN MAINTENANCE PERSONNEL.

Sources:

NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001212X23406

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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