A ce-560 captain reported the landing gear would not extend with the normal system but the alternate...

Attributes
ACN	891602
Time
Date	201005
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation V/Ultra/Encore (C560)
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Component
Aircraft Component	Landing Gear
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Flight Instructor
Experience	Air Traffic Control Military 10 Air Traffic Control Radar 10 Air Traffic Control Supervisory 10 Flight Crew Last 90 Days 60 Flight Crew Total 13000 Flight Crew Type 500
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Normal gear extension did not work on final approach. Executed go around; advised ATC of problem and declared an emergency as a precaution. After leveling off at assigned altitude [we] ran emergency gear extension check list. As soon as the alternate gear extension lever [was] pulled the gear came down and locked. Advised ATC and did a normal approach and landing. After post flight inspection revealed gear was safe with no hydraulic leaks. Called maintenance and advised them of the problem. Asked maintenance representative specifically if I needed to pin gear or needed a ferry permit and was advised that it was not necessary. I ferried the aircraft after thorough preflight verifying the gear was down and locked during preflight. I maintained this configuration during the five minute flight.

Original NASA ASRS Text

Title: A CE-560 Captain reported the landing gear would not extend with the normal system but the alternate extension worked fine. He declared an emergency and landed normally.

Narrative: Normal gear extension did not work on final approach. Executed go around; advised ATC of problem and declared an emergency as a precaution. After leveling off at assigned altitude [we] ran emergency gear extension check list. As soon as the alternate gear extension lever [was] pulled the gear came down and locked. Advised ATC and did a normal approach and landing. After post flight inspection revealed gear was safe with no hydraulic leaks. Called maintenance and advised them of the problem. Asked Maintenance Representative specifically if I needed to pin gear or needed a ferry permit and was advised that it was not necessary. I ferried the aircraft after thorough preflight verifying the gear was down and locked during preflight. I maintained this configuration during the five minute flight.

Data retrieved from NASA's ASRS site as of April 2012 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.

A ce-560 captain reported the landing gear would not extend with the normal system but the alternate extension worked fine. He declared an emergency and landed normally.