A B767-300's left main gear did not indicate down so a go around was executed; an emergency declared...

Attributes
ACN	951772
Time
Date	201105
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	IFR
Component
Aircraft Component	Landing Gear Indicating System
Person 1
Function	First Officer
Person 2
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

VOR 13L approach. After landing gear selected down; left main gear did not indicate down. Leveled aircraft at 1;000 ft for a pass over 13L for visual inspection of left main mount by tower. Tower reported left main appeared down. On go-around we were directed by tower to maintain runway heading and climb to 2;000 ft. We may have deviated slightly from both heading and altitude during go-around. After review of QRH; we determined that the most likely cause the left gear did not indicate down was inoperative annunciator bulbs (annunciator lights would not illuminate when tested). In an abundance of caution; we declared an emergency and requested airfield rescue and fire fighter equipment. Vectored to VOR 13R (longer runway) completed uneventful approach and landing. Taxied to gate.

Original NASA ASRS Text

Title: A B767-300's left main gear did not indicate down so a go around was executed; an emergency declared and during troubleshoot it was discovered the gear down light did not test so was assumed inoperative. A normal landing was accomplished.

Narrative: VOR 13L approach. After landing gear selected down; left main gear did not indicate down. Leveled aircraft at 1;000 FT for a pass over 13L for visual inspection of left main mount by Tower. Tower reported left main appeared down. On go-around we were directed by Tower to maintain runway heading and climb to 2;000 FT. We may have deviated slightly from both heading and altitude during go-around. After review of QRH; we determined that the most likely cause the left gear did not indicate down was inoperative annunciator bulbs (annunciator lights would not illuminate when tested). In an abundance of caution; we declared an emergency and requested Airfield Rescue and Fire Fighter equipment. Vectored to VOR 13R (longer runway) completed uneventful approach and landing. Taxied to gate.

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.