<< >> NASA ASRS Report 965023, August 2011

A SF340 left landing gear position sensor cannon plug was found loose after an emergency was declared because of an unsafe gear indication.

Attributes
ACN	965023
Time
Date	201108
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	Saab 340 Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Indicating and Warning - Landing Gear
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Commercial
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

On final approach when gear was selected down; only the nose and right main gear down lock lights illuminated. The gear handle disagreement light was extinguished as well which means that all gear agrees with the position of the handle. While selecting flaps to 20 the configuration cwp light and horn sounded. We ran the emergency/non normal checklist and then executed a go-around/missed approach. ATC; operations; dispatch and maintenance were notified and we discussed the situation with maintenance thoroughly. We declared an emergency with ATC and notified emergency personnel to standby at the runway of landing. Passengers were kept fully informed of the situation. A normal landing then followed. The event occurred because of a failure to receive a green down and locked light from the left main gear during extension. This was due to a cannon plug that was found unplugged.

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Original NASA ASRS Text

Title: A SF340 left landing gear position sensor cannon plug was found loose after an emergency was declared because of an unsafe gear indication.

Narrative: On final approach when gear was selected down; only the nose and right main gear down lock lights illuminated. The gear handle disagreement light was extinguished as well which means that all gear agrees with the position of the handle. While selecting flaps to 20 the CONFIG CWP light and horn sounded. We ran the emergency/non normal checklist and then executed a go-around/missed approach. ATC; Operations; Dispatch and Maintenance were notified and we discussed the situation with Maintenance thoroughly. We declared an emergency with ATC and notified emergency personnel to standby at the runway of landing. Passengers were kept fully informed of the situation. A normal landing then followed. The event occurred because of a failure to receive a green down and locked light from the left main gear during extension. This was due to a cannon plug that was found unplugged.

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.