GA light transport jet aircraft's navigation and gyro equipment failed prior to an instrument approach resulting in the flight crew making an ASR approach to VFR conditions.

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Attributes
ACN	231703
Time
Date	199301
Day	Wed
Place
Locale Reference	airport : tul
State Reference	OK
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : tul
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 120 flight time total : 2500 flight time type : 250
ASRS Report	231703
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Due to a freak electrical malfunction we lost all navigation radios and directional gyros during our descent. Since the field was VFR we requested an ASR approach to MVA. We were then cleared for a visual approach at 1600 to 1800 ft after establishing visual contact with the runway. ASR approachs are very helpful when all other radio navigation is impossible. ASR approachs should be available at all possible locations.

Original NASA ASRS Text

Title: GA LTT JET ACFT'S NAV AND GYRO EQUIP FAILED PRIOR TO AN INST APCH RESULTING IN THE FLC MAKING AN ASR APCH TO VFR CONDITIONS.

Narrative: DUE TO A FREAK ELECTRICAL MALFUNCTION WE LOST ALL NAV RADIOS AND DIRECTIONAL GYROS DURING OUR DSCNT. SINCE THE FIELD WAS VFR WE REQUESTED AN ASR APCH TO MVA. WE WERE THEN CLRED FOR A VISUAL APCH AT 1600 TO 1800 FT AFTER ESTABLISHING VISUAL CONTACT WITH THE RWY. ASR APCHS ARE VERY HELPFUL WHEN ALL OTHER RADIO NAV IS IMPOSSIBLE. ASR APCHS SHOULD BE AVAILABLE AT ALL POSSIBLE LOCATIONS.

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.