Serious incident Grumman G-111 Albatross N112FB, Sunday 3 June 1984

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Date:	Sunday 3 June 1984
Time:	08:13 LT
Type:	Grumman G-111 Albatross
Owner/operator:	Chalk's Int'l Airlines
Registration:	N112FB
MSN:	148328
Year of manufacture:	1979
Total airframe hrs:	8458 hours
Engine model:	WRIGHT R-1820-82
Fatalities:	Fatalities: 0 / Occupants: 3
Other fatalities:	0
Aircraft damage:	Minor
Category:	Serious incident
Location:	West Palm Beach, FL - United States of America
Phase:	Taxi
Nature:	Ferry/positioning
Departure airport:	Ft.lauderdale, FL (FLL
Destination airport:	West Palm Beach, FL
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
AFTER A REPOSITIONING FLT, THE MAIN GEAR COLLAPSED. AN EXAM OF THE HAND PUMP SELECTOR CONTROL VALVE REVEALED THAT ONE OF THE TWO DUMP PORTS FOR THR FLAP POSITION HAD A HYDRAULIC LEAK. REPORTEDLY, THIS ALLOWED SYSTEM PRESSURE TO RETRACT THE GEAR. THE VALVE, P/N 9055-1, HAD A TOTAL FLT TIME OF 1662.8 HRS SINCE BEING INSTALLED ON 7/21/81.

Probable Cause:

Accident investigation: