Accident Piper PA-23-250 N40249, Tuesday 1 November 1983

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Date:	Tuesday 1 November 1983
Time:	11:16 LT
Type:	Piper PA-23-250
Owner/operator:	Cornerstone Aviation, Inc.
Registration:	N40249
MSN:	27-7305055
Year of manufacture:	1973
Total airframe hrs:	3324 hours
Engine model:	Lycoming IO-540-C4B5
Fatalities:	Fatalities: 0 / Occupants: 4
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Greer, SC - United States of America
Phase:	Landing
Nature:	Training
Departure airport:	Greenville, SC (KGMU)
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
DURING THE FLT, HYDRAULIC FAILURE OF THE LANDING SYS OCCURRED & THE AIRCREW WERE UNABLE TO GET THE GEAR LOCKED IN THE DOWN POSITION. AFTER ORBITING FOR OVER AN HOUR, A LANDING WAS MADE. DURING TOUCHDOWN, THE GEAR COLLAPSED. AN EXAM REVEALED THAT AN AILERON BALANCE CABLE HAD CHAFED AGAINST A HYDRAULIC LINE IN THE LANDING GEAR SYS UNTIL A HOLE WAS WORN THRU THE LINE. THIS ALLOWED THE HYDRAULIC FLUID TO LEAK OUT.

Probable Cause:

Accident investigation: