Aviation Accident Summaries

Aviation Accident Summary LAX83FUM08

SAN DIEGO, CA, USA

Aircraft #1

N401JC

CLARK SUPER Q2

Analysis

THE HOEM BUILT ACFT WAS CONSTRUCTED USING THE BASIC DESIGN OF THE Q2, A 2 PALCE PLANE WITH A CANARD. HOWEVER, IT WAS BUILT WITH SIGNIGICANT DESIGN CHANGES. THESE INCLUDED A 2ND ELEVATOR WHICH CREATED AT-TAIL. THE 2ND ELEVATOR WAS OPERATED BY A HANDLE WHICH WAS MOUNTED ON THE CONSOLE WALL. ALSO, THE ACFT WAS EQUIPPED WITH A 104 HP LIQUID COOLED ENG INSTEAD OF AN AIR COOLED 64 HP ENG; THE GROSS WT WAS INCREASED FROM 1000 TO 1350 LBS; & THE FUEL CAPACITY WAS INCREASED FROM 20 TO 36 GAL & AN ADDITIONAL AFT TANK WAS INSTALLED. AFTER HIS SPEED TAXI CHECKS, THE OWNER/BUILDER/PLT TOOK OFF ON HIS 1ST FLT. WITNESSES REPORTED THAT DURING TAKEOFF, THE CFT CLIMBED TO AN ALT OF APRX 100 TO 200 FT AGL, THEN ENTERED A STEEP DESCENT & CRASHED. NO PREIMPACT PART FAILURE WAS FOUND. THE HANDLE FOR THE 2ND ELEVATOR WAS FOUND IN A FULL TRAVEL (ACFT NOSE DOWN) POSITION. THE 2ND ELEVATOR WAS FOUND TO BE 'REVERSIBLE' & AIRLOADS AT TAKEOFF SPEEDS COULD HAVE DRIVEN IT TO A FULL TRAVEL (ACFT NOSE DOWN) POSITION.

 

Source: NTSB Aviation Accident Database

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