A cl-60's landing gear handle would not go to the full down position before landing so the emergency...

Narrative:

At approximately 7 DME on ZZZ runway 27 localizer; during landing checklist 'gear down' callout; pilot not flying noticed gear down lever had limited movement and gear indication showed left gear down/green and nose gear/amber; right main gear/amber. Crew recycled gear up and reattempted; with same results. Contacted tower for go-around and instructions. Tower gave turn/heading and altitude. Crew complied. Tower queried nature of problem and crew responded with 'gear malfunction.' crew asked for diversion to ZZZ1 and time enroute to run checklist. Crew swapped flight position responsibilities. Captain now pilot flying. First officer now pilot not flying. Enroute to ZZZ1; pilot not flying; now first officer; had same results with first attempt. On second attempt; gear indicated '3 green down;' however; gear handle was positioned in between the 'up' and (halfway between) the 'normal down' position. Gear handle was not in a locked position; nor at any time during the attempts would it move past the center position that the aircraft ended up landing with. Left for maintenance verification. Crew briefed; and performed the emergency gear extension checklist; and planned for and coordinated a tower fly-by at ZZZ1 for visual inspection by tower personnel. A visual confirmation was received by the crew from the tower and the remainder of the before landing checklist was accomplished; crew rebriefed landing configuration with flight attendant and an emergency evacuation route was established (if needed). Emergency ground equipment was notified and standing by; crew advised tower that the aircraft would remain stopped and engines cut off after 'pinning gear on runway 29.' landing was uneventful. Aircraft brought to a full stop. Gear pinned; after landing and shutdown checklist run. Aircraft towed to FBO ramp by tug. Maintenance later provided follow-up that a nut/bolt from windshield rework was found to be located in center console obstructing gear handle.

Original NASA ASRS Text

Title: A CL-60's landing gear handle would not go to the full down position before landing so the EMERGENCY GEAR EXTENSION checklist was used prior to an emergency landing. A bolt and nut from a previous windshield change were found to be obstructing the handle.

Narrative: At approximately 7 DME on ZZZ Runway 27 LOC; during Landing checklist 'Gear down' callout; Pilot not flying noticed Gear Down lever had limited movement and gear indication showed left gear down/green and nose gear/amber; right main gear/amber. Crew recycled gear up and reattempted; with same results. Contacted Tower for go-around and instructions. Tower gave turn/heading and altitude. Crew complied. Tower queried nature of problem and crew responded with 'Gear Malfunction.' Crew asked for diversion to ZZZ1 and time enroute to run checklist. Crew swapped flight position responsibilities. Captain now pilot flying. First Officer now pilot not flying. Enroute to ZZZ1; pilot not flying; now First Officer; had same results with first attempt. On second attempt; gear indicated '3 Green Down;' however; Gear Handle was positioned in between the 'Up' and (halfway between) the 'Normal Down' position. Gear Handle was not in a locked position; nor at any time during the attempts would it move past the center position that the aircraft ended up landing with. Left for Maintenance verification. Crew briefed; and performed the Emergency Gear Extension checklist; and planned for and coordinated a Tower fly-by at ZZZ1 for visual inspection by Tower personnel. A visual confirmation was received by the crew from the Tower and the remainder of the Before Landing checklist was accomplished; crew rebriefed landing configuration with Flight Attendant and an emergency evacuation route was established (if needed). Emergency ground equipment was notified and standing by; crew advised Tower that the aircraft would remain stopped and engines cut off after 'pinning gear on Runway 29.' Landing was uneventful. Aircraft brought to a full stop. Gear Pinned; After Landing and Shutdown checklist run. Aircraft towed to FBO ramp by tug. Maintenance later provided follow-up that a nut/bolt from windshield rework was found to be located in center console obstructing gear handle.

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.

Attributes
ACN	827200
Time
Date	200903
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	Challenger CL604
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Gear Lever/Selector
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance

A cl-60's landing gear handle would not go to the full down position before landing so the emergency gear extension checklist was used prior to an emergency landing. A bolt and nut from a previous windshield change were found to be obstructing the handle.