C500 flight crew uses alternate gear extension procedure when the gear wouldn't come down.

Attributes
ACN	699278
Time
Date	200605
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ord.tower
Operator	general aviation : personal
Make Model Name	Citation I
Operating Under FAR Part	Part 91
Flight Phase	descent : approach landing : missed approach
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : multi engine pilot : private pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 15000 flight time type : 125
ASRS Report	699278
Person 2
Affiliation	other
Function	flight crew : captain oversight : pic
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : landed in emergency condition flight crew : overrode automation flight crew : diverted to another airport flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

At FAF tried to lower landing gear; however; it would not extend. Hydraulic pump came on but doors remained closed and gear stayed up (red light; no green). Missed approach and departed north. Called FSS; asked them to verify that fire fighters were on duty. Declared emergency with approach control. Alternate gear extension worked and landed uneventfully. (Nose gear came down immediately but mains took yawing. Got 3 down and locked but 'blew bottle' anyway per procedure.) canceled emergency status on taxi in. Maintenance purged; reset; and refilled system as per maintenance manual. We flew the plane back gear down. That flight was uneventful.

Original NASA ASRS Text

Title: C500 FLT CREW USES ALTERNATE GEAR EXTENSION PROC WHEN THE GEAR WOULDN'T COME DOWN.

Narrative: AT FAF TRIED TO LOWER LNDG GEAR; HOWEVER; IT WOULD NOT EXTEND. HYD PUMP CAME ON BUT DOORS REMAINED CLOSED AND GEAR STAYED UP (RED LIGHT; NO GREEN). MISSED APCH AND DEPARTED N. CALLED FSS; ASKED THEM TO VERIFY THAT FIRE FIGHTERS WERE ON DUTY. DECLARED EMER WITH APCH CTL. ALTERNATE GEAR EXTENSION WORKED AND LANDED UNEVENTFULLY. (NOSE GEAR CAME DOWN IMMEDIATELY BUT MAINS TOOK YAWING. GOT 3 DOWN AND LOCKED BUT 'BLEW BOTTLE' ANYWAY PER PROC.) CANCELED EMER STATUS ON TAXI IN. MAINT PURGED; RESET; AND REFILLED SYS AS PER MAINT MANUAL. WE FLEW THE PLANE BACK GEAR DOWN. THAT FLT WAS UNEVENTFUL.

Data retrieved from NASA's ASRS site as of January 2009 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.