After gear extension during approach DA50 flight crew does not receive a safe indication for the lef...

Narrative:

While descending on the visual approach both light bulbs failed for our left main landing gear indicator. The captain elected to divert for better maintenance; a longer runway; and crash fire rescue availability. We informed the tower controller that we had a gear problem and that we wanted to divert. The tower controller stated; 'then you need to go to approach.' we were not given a heading to fly; an altitude to maintain; or frequency to use. During this time we received a TA for traffic; the captain said he was starting a climb to avoid the traffic. The tower controller called us and said that we have traffic at 3;000 ft above us. The captain responded to the tower controller that he was climbing for a TCAS alert. The captain directed me to run the QRH checklist for the gear problem and to call the chief pilot on the flight phone; so I did not see the traffic in question. I switched to approach control on the frequency we had used for arrival and told them about our landing gear situation. That controller told us that we have traffic above on the arrival. The captain responded to him that we had climbed for a TCAS alert and were returning to 2;000 ft. The controller stated that; 'there isn't a problem.' we received vectors and did a low approach over the runway where someone on the ground looked at our gear and reported that it 'appeared to be down.' we returned and landed without further incident. I think it would have been better if I had not called the chief pilot on the phone in the traffic pattern; while working the QRH; and working the radios. It would have been better if I had focused on the operation of the aircraft until the captain completed flying the missed approach and contacted the approach controller. It would have also been helpful if we had received some missed approach directions from the tower controller; such as a heading to fly and an altitude to maintain.

Original NASA ASRS Text

Title: After gear extension during approach DA50 flight crew does not receive a safe indication for the left main gear. The Captain elects to divert to an airport with a longer runway and ARFF personnel. Maintenance discovers two burned out gear indicator bulbs.

Narrative: While descending on the visual approach both light bulbs failed for our left main landing gear indicator. The Captain elected to divert for better maintenance; a longer runway; and crash fire rescue availability. We informed the Tower Controller that we had a gear problem and that we wanted to divert. The Tower Controller stated; 'Then you need to go to Approach.' We were not given a heading to fly; an altitude to maintain; or frequency to use. During this time we received a TA for traffic; the Captain said he was starting a climb to avoid the traffic. The Tower Controller called us and said that we have traffic at 3;000 FT above us. The Captain responded to the Tower Controller that he was climbing for a TCAS Alert. The Captain directed me to run the QRH checklist for the gear problem and to call the Chief Pilot on the flight phone; so I did not see the traffic in question. I switched to Approach Control on the frequency we had used for arrival and told them about our landing gear situation. That Controller told us that we have traffic above on the arrival. The Captain responded to him that we had climbed for a TCAS alert and were returning to 2;000 FT. The Controller stated that; 'there isn't a problem.' We received vectors and did a low approach over the runway where someone on the ground looked at our gear and reported that it 'appeared to be down.' We returned and landed without further incident. I think it would have been better if I had not called the Chief Pilot on the phone in the traffic pattern; while working the QRH; and working the radios. It would have been better if I had focused on the operation of the aircraft until the Captain completed flying the missed approach and contacted the Approach Controller. It would have also been helpful if we had received some missed approach directions from the Tower Controller; such as a heading to fly and an altitude to maintain.

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	947823
Time
Date	201104
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	Falcon 50
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Component
Aircraft Component	Indicating and Warning - Landing Gear
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 90 Flight Crew Total 8500 Flight Crew Type 1200
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 9000 Flight Crew Type 1000
Events
Anomaly	ATC Issue All Types Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude
Miss Distance	Vertical 700

After gear extension during approach DA50 flight crew does not receive a safe indication for the left main gear. The captain elects to divert to an airport with a longer runway and arff personnel. Maintenance discovers two burned out gear indicator bulbs.