An EMB145 lost both navigation radios descending through 1500 ft on an ILS. Crew declared an emergency and executed second approach in windshear to a go around. Flight landed on third approach.

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Attributes
ACN	729508
Time
Date	200702
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 1500
Environment
Weather Elements	Turbulence Windshear other
Light	Night
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 19l other
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	729508
Events
Anomaly	aircraft equipment problem : critical inflight encounter : turbulence other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : landed in emergency condition flight crew : executed missed approach flight crew : executed go around flight crew : declared emergency
Supplementary
Problem Areas	Weather Aircraft
Primary Problem	Aircraft

Narrative:

Navigation malfunction. Cleared for ILS runway 19L. At 1500 ft AGL; lost both navigation radios and went around. Vectored for a GPS 19L approach and couldn't slow because of windshear; +/-10 KTS. Broke off the approach and declared emergency and vectored for another approach to same runway. Shot the approach without incident. Red X's on the GS and localizer. Dash lines on the radios. Decided to use GPS for the approach. Callback conversation with reporter revealed the following information: reporter stated that he did not follow up with maintenance on this failure in order to find out definitively what caused it. There was no electrical problem; the ground based ILS was operating normally and the only common item is a communications bus. The radios can be xferred from 1 pilot to another via this bus; and report though possibly the radio bus failed but he does not know for sure.

Original NASA ASRS Text

Title: AN EMB145 LOST BOTH NAV RADIOS DSNDING THROUGH 1500 FT ON AN ILS. CREW DECLARED AN EMER AND EXECUTED SECOND APCH IN WINDSHEAR TO A GAR. FLT LANDED ON THIRD APCH.

Narrative: NAV MALFUNCTION. CLRED FOR ILS RWY 19L. AT 1500 FT AGL; LOST BOTH NAV RADIOS AND WENT AROUND. VECTORED FOR A GPS 19L APCH AND COULDN'T SLOW BECAUSE OF WINDSHEAR; +/-10 KTS. BROKE OFF THE APCH AND DECLARED EMER AND VECTORED FOR ANOTHER APCH TO SAME RWY. SHOT THE APCH WITHOUT INCIDENT. RED X'S ON THE GS AND LOC. DASH LINES ON THE RADIOS. DECIDED TO USE GPS FOR THE APCH. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE DID NOT FOLLOW UP WITH MAINT ON THIS FAILURE IN ORDER TO FIND OUT DEFINITIVELY WHAT CAUSED IT. THERE WAS NO ELECTRICAL PROB; THE GND BASED ILS WAS OPERATING NORMALLY AND THE ONLY COMMON ITEM IS A COMS BUS. THE RADIOS CAN BE XFERRED FROM 1 PLT TO ANOTHER VIA THIS BUS; AND RPT THOUGH POSSIBLY THE RADIO BUS FAILED BUT HE DOES NOT KNOW FOR SURE.

Data retrieved from NASA's ASRS site as of January 2009 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.