A B737-300 captain reported that his aircraft's localizer GS failed while on approach to lga in solid IMC. He declared an emergency and diverted to VFR conditions at syr.

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Attributes
ACN	598610
Time
Date	200311
Day	Wed
Place
Locale Reference	airport : lga.airport
State Reference	NY
Altitude	msl single value : 1500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 4 other
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 5000
ASRS Report	598610
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	aircraft equipment other aircraft equipment : ils other flight crewa
Resolutory Action	controller : issued new clearance flight crew : diverted to alternate flight crew : landed in emergency condition flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Vectored to final approach course for the ILS 4 lga at 2700 ft MSL. Localizer and GS captured and aircraft began IMC coupled approach. Heading discrepancies noted during approach and by 1500 ft, the localizer needle deviated to full scale. Initiated a missed approach, climbed to assigned altitude, advised ATC of erroneous heading indications and declared an emergency. ATC confirmed syr was VMC (9000 ft overcast 10 SM visibility). Proceeded to syr and landed normally.

Original NASA ASRS Text

Title: A B737-300 CAPT RPTED THAT HIS ACFT'S LOC GS FAILED WHILE ON APCH TO LGA IN SOLID IMC. HE DECLARED AN EMER AND DIVERTED TO VFR CONDITIONS AT SYR.

Narrative: VECTORED TO FINAL APCH COURSE FOR THE ILS 4 LGA AT 2700 FT MSL. LOC AND GS CAPTURED AND ACFT BEGAN IMC COUPLED APCH. HDG DISCREPANCIES NOTED DURING APCH AND BY 1500 FT, THE LOC NEEDLE DEVIATED TO FULL SCALE. INITIATED A MISSED APCH, CLBED TO ASSIGNED ALT, ADVISED ATC OF ERRONEOUS HDG INDICATIONS AND DECLARED AN EMER. ATC CONFIRMED SYR WAS VMC (9000 FT OVCST 10 SM VISIBILITY). PROCEEDED TO SYR AND LANDED 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.