B757-200 crew had landing gear indicators show the gear was not down and locked at ZZZ.

Attributes
ACN	526069
Time
Date	200109
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 3000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Navigation In Use	other
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : instrument pilot : multi engine pilot : atp pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 7600 flight time type : 3800
ASRS Report	526069
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : gear warning lights other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : declared emergency flight crew : executed missed approach flight crew : landed in emergency condition none taken : detected after the fact other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Approaching bwi at approximately XA00 local, lowered landing gear and got following indications: nose gear - down and locked, left main landing gear - no indication, right main landing gear - 1/2 and intermittent indication. Tried master lights test - inconclusive, pushed on light annunciators themselves - lights would flicker on, but could not get a safe down and locked indication. No secondaries of unsafe gear, suspected annunciation malfunction. Followed applicable procedures, contacted dispatcher and maintenance. Maintenance also believed the problem to be that of the indicators. Declared emergency, briefed passenger and crew flew low pass down runway for visual confirmation of gear position. Captain made landing on runway 33L, stopped straight ahead and requested that maintenance come pin the gear prior to taxiing to the gate. After some delay maintenance pinned gear, taxied to the terminal and passenger deplaned normally.

Original NASA ASRS Text

Title: B757-200 CREW HAD LNDG GEAR INDICATORS SHOW THE GEAR WAS NOT DOWN AND LOCKED AT ZZZ.

Narrative: APCHING BWI AT APPROX XA00 LCL, LOWERED LNDG GEAR AND GOT FOLLOWING INDICATIONS: NOSE GEAR - DOWN AND LOCKED, L MAIN LNDG GEAR - NO INDICATION, R MAIN LNDG GEAR - 1/2 AND INTERMITTENT INDICATION. TRIED MASTER LIGHTS TEST - INCONCLUSIVE, PUSHED ON LIGHT ANNUNCIATORS THEMSELVES - LIGHTS WOULD FLICKER ON, BUT COULD NOT GET A SAFE DOWN AND LOCKED INDICATION. NO SECONDARIES OF UNSAFE GEAR, SUSPECTED ANNUNCIATION MALFUNCTION. FOLLOWED APPLICABLE PROCS, CONTACTED DISPATCHER AND MAINT. MAINT ALSO BELIEVED THE PROB TO BE THAT OF THE INDICATORS. DECLARED EMER, BRIEFED PAX AND CREW FLEW LOW PASS DOWN RWY FOR VISUAL CONFIRMATION OF GEAR POS. CAPT MADE LNDG ON RWY 33L, STOPPED STRAIGHT AHEAD AND REQUESTED THAT MAINT COME PIN THE GEAR PRIOR TO TAXIING TO THE GATE. AFTER SOME DELAY MAINT PINNED GEAR, TAXIED TO THE TERMINAL AND PAX DEPLANED NORMALLY.

Data retrieved from NASA's ASRS site as of July 2007 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.