Both (all) navigation receivers of an small transport twin failed resulting in an ASR approach below...

Attributes
ACN	294245
Time
Date	199501
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : det
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 1500
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dtw tower : dtw
Operator	general aviation : corporate
Make Model Name	Cessna 340/340A
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 45 flight time total : 5000 flight time type : 40
ASRS Report	294245
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

Lost both navs. Faded in and out determined unusable. Shot missed and approach to ILS det. Checked WX 200-300 ft 1-2 in general vicinity. Controller vectored me to my request to ASR det. Shot approach. Believed only opportunity available to land. Radar altimeter working properly. Validated altimeter at 1 mi. Had ground contact and airport lights in distance. Descended to minimums of ILS 200 ft and landed safely without incident or declaring emergency. Things happen so quickly probably went below minimums but remained safe. If gca not available, ASR can be a lifesaver.

Original NASA ASRS Text

Title: BOTH (ALL) NAV RECEIVERS OF AN SMT TWIN FAILED RESULTING IN AN ASR APCH BELOW MINIMUMS.

Narrative: LOST BOTH NAVS. FADED IN AND OUT DETERMINED UNUSABLE. SHOT MISSED AND APCH TO ILS DET. CHKED WX 200-300 FT 1-2 IN GENERAL VICINITY. CTLR VECTORED ME TO MY REQUEST TO ASR DET. SHOT APCH. BELIEVED ONLY OPPORTUNITY AVAILABLE TO LAND. RADAR ALTIMETER WORKING PROPERLY. VALIDATED ALTIMETER AT 1 MI. HAD GND CONTACT AND ARPT LIGHTS IN DISTANCE. DSNDED TO MINIMUMS OF ILS 200 FT AND LANDED SAFELY WITHOUT INCIDENT OR DECLARING EMER. THINGS HAPPEN SO QUICKLY PROBABLY WENT BELOW MINIMUMS BUT REMAINED SAFE. IF GCA NOT AVAILABLE, ASR CAN BE A LIFESAVER.

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.

Both (all) navigation receivers of an small transport twin failed resulting in an ASR approach below minimums.