Small aircraft has right gear fail to lock, collapses on rollout.

Attributes
ACN	254427
Time
Date	199310
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ffz
State Reference	AZ
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dtw
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 10 flight time total : 14000 flight time type : 360
ASRS Report	254427
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During a local proficiency flight I noticed a problem with my landing gear hydraulic system. Upon lowering the gear I failed to have a down and locked indication on the right gear. I notified the tower and did a fly-by and the tower stated the gear appeared to be down. Upon touchdown, and during the rollout, the right gear collapsed. Upon investigation, the right landing gear hydraulic actuator had separated from itself, which prevented the gear to extend to the locked position. No structural damage occurred. Aircraft was a war plane replica (experimental).

Original NASA ASRS Text

Title: SMA HAS R GEAR FAIL TO LOCK, COLLAPSES ON ROLLOUT.

Narrative: DURING A LCL PROFICIENCY FLT I NOTICED A PROB WITH MY LNDG GEAR HYD SYS. UPON LOWERING THE GEAR I FAILED TO HAVE A DOWN AND LOCKED INDICATION ON THE R GEAR. I NOTIFIED THE TWR AND DID A FLY-BY AND THE TWR STATED THE GEAR APPEARED TO BE DOWN. UPON TOUCHDOWN, AND DURING THE ROLLOUT, THE R GEAR COLLAPSED. UPON INVESTIGATION, THE R LNDG GEAR HYD ACTUATOR HAD SEPARATED FROM ITSELF, WHICH PREVENTED THE GEAR TO EXTEND TO THE LOCKED POS. NO STRUCTURAL DAMAGE OCCURRED. ACFT WAS A WAR PLANE REPLICA (EXPERIMENTAL).

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.