Serious incident Cessna 560 Citation Ultra N314QS, Sunday 5 March 2000

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Date:	Sunday 5 March 2000
Time:	13:00 LT
Type:	Cessna 560 Citation Ultra
Owner/operator:	Executive Jet Inc.
Registration:	N314QS
MSN:	560-0441
Total airframe hrs:	2619 hours
Engine model:	P&W JT15-5D
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Minor
Category:	Serious incident
Location:	Key Largo, FL - United States of America
Phase:	Landing
Nature:	Unknown
Departure airport:	Palm Beach, FL (KPBI)
Destination airport:	(X09)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
The pilot completed the before landing check, which included the lowering of the landing gear, several miles on short final. The pilot recalled that the landing gear indicator lights were green, or landing gear down and locked. After the airplane landed, the pilot deployed the thrust reverses. At approximately the same time, the nose gear retracted into the wheel well. The airplane slid down runway 04, and came to rest 2000 feet from the end of the runway. The initial examination of the airplane disclosed that the nose gear up-down-lock actuator experienced a mechanical failure. During the subsequent examination of the assembly, no mechanical problem was detected during functional testing. All functional pressures and other operational parameters tested within the normal certificated limits.

Probable Cause: The malfunction of the nose gear locking mechanism for undetermined reason.

Accident investigation: