Flight crew of small transport jet aircraft deviated from assigned departure heading track due to momentary failure of the aircraft navigation communication equipment.

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Attributes
ACN	218070
Time
Date	199208
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phx
State Reference	AZ
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phx
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : cfi
Experience	flight time last 90 days : 80 flight time total : 13000 flight time type : 700
ASRS Report	218070
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	218548
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	aircraft : equipment problem dissipated controller : issued new clearance flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

After departing phx and flying runway heading with instructions to follow the departure that was published, we lost communications and navs became erratic to the point we were unable to decide if any, or which, might be correct. I elected to go VFR and turned back on right downwind to return to airport. After a very short period of time, everything began to work normally and the controller gave us headings back on course and we continued back on our normal flight plan.

Original NASA ASRS Text

Title: FLC OF SMT JET ACFT DEVIATED FROM ASSIGNED DEP HDG TRACK DUE TO MOMENTARY FAILURE OF THE ACFT NAV COM EQUIP.

Narrative: AFTER DEPARTING PHX AND FLYING RWY HDG WITH INSTRUCTIONS TO FOLLOW THE DEP THAT WAS PUBLISHED, WE LOST COMS AND NAVS BECAME ERRATIC TO THE POINT WE WERE UNABLE TO DECIDE IF ANY, OR WHICH, MIGHT BE CORRECT. I ELECTED TO GO VFR AND TURNED BACK ON R DOWNWIND TO RETURN TO ARPT. AFTER A VERY SHORT PERIOD OF TIME, EVERYTHING BEGAN TO WORK NORMALLY AND THE CTLR GAVE US HDGS BACK ON COURSE AND WE CONTINUED BACK ON OUR NORMAL FLT PLAN.

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.