C560 crew had a landing gear problem while on approach to tus.

Attributes
ACN	531325
Time
Date	200111
Day	Tue
Local Time Of Day	1201 To 1800
Place
Altitude	msl single value : 5200
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : u90.tracon tower : tus.tower
Operator	general aviation : corporate
Make Model Name	Citation V
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 135 flight time total : 3670 flight time type : 155
ASRS Report	531325
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : gear indicating lights other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : landed in emergency condition flight crew : declared emergency other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On visual approach to runway 29R at tus, we got an unsafe nose gear indication when the gear was selected down. We then departed the local traffic area and troubleshot the system per checklist 'landing gear will not extend.' we verified the light functioned via rotary test. The flaps selected 35 degrees did not produce a warning horn, but the indexer lights would not illuminate to confirm a gear safe position. After consulting the program manager and maintenance, we completed the emergency gear extension procedure (including the blow bottle). An emergency was declared and we requested the emergency vehicles. The landing was completed without incident.

Original NASA ASRS Text

Title: C560 CREW HAD A LNDG GEAR PROB WHILE ON APCH TO TUS.

Narrative: ON VISUAL APCH TO RWY 29R AT TUS, WE GOT AN UNSAFE NOSE GEAR INDICATION WHEN THE GEAR WAS SELECTED DOWN. WE THEN DEPARTED THE LCL TFC AREA AND TROUBLESHOT THE SYS PER CHKLIST 'LNDG GEAR WILL NOT EXTEND.' WE VERIFIED THE LIGHT FUNCTIONED VIA ROTARY TEST. THE FLAPS SELECTED 35 DEGS DID NOT PRODUCE A WARNING HORN, BUT THE INDEXER LIGHTS WOULD NOT ILLUMINATE TO CONFIRM A GEAR SAFE POS. AFTER CONSULTING THE PROGRAM MGR AND MAINT, WE COMPLETED THE EMER GEAR EXTENSION PROC (INCLUDING THE BLOW BOTTLE). AN EMER WAS DECLARED AND WE REQUESTED THE EMER VEHICLES. THE LNDG WAS COMPLETED WITHOUT INCIDENT.

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.