Govt aircraft looses VOR signals and transponder in IMC. Becomes active again during trip.

Attributes
ACN	173699
Time
Date	199103
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dru
State Reference	MT
Altitude	msl bound lower : 15000 msl bound upper : 15000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	other
Make Model Name	Small Transport
Flight Phase	cruise other
Route In Use	enroute airway : v2
Flight Plan	IFR
Person 1
Affiliation	government other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 25 flight time total : 8000 flight time type : 100
ASRS Report	173699
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

En route mso to hln via V2, center asked if my transponder was working and I reset it tested ok but they were not receiving a signal. This was at 15000' between dru and mso about 30 out of dru (DME) at 5 DME my DME failed and VOR signal became intermittent. I turned at dru and proceed to hnl on V2 with still no transponder being received be center and an occasional flag on VOR. About half way VOR navigation became solid and center picked up my transponder. I was 6 mi north of course, but no conflict with any other airspace or traffic. Possible moisture problem in avionics as I was IMC in moisture. No further problems there after.

Original NASA ASRS Text

Title: GOVT ACFT LOOSES VOR SIGNALS AND TRANSPONDER IN IMC. BECOMES ACTIVE AGAIN DURING TRIP.

Narrative: ENRTE MSO TO HLN VIA V2, CTR ASKED IF MY XPONDER WAS WORKING AND I RESET IT TESTED OK BUT THEY WERE NOT RECEIVING A SIGNAL. THIS WAS AT 15000' BTWN DRU AND MSO ABOUT 30 OUT OF DRU (DME) AT 5 DME MY DME FAILED AND VOR SIGNAL BECAME INTERMITTENT. I TURNED AT DRU AND PROCEED TO HNL ON V2 WITH STILL NO XPONDER BEING RECEIVED BE CTR AND AN OCCASIONAL FLAG ON VOR. ABOUT HALF WAY VOR NAV BECAME SOLID AND CTR PICKED UP MY XPONDER. I WAS 6 MI N OF COURSE, BUT NO CONFLICT WITH ANY OTHER AIRSPACE OR TFC. POSSIBLE MOISTURE PROB IN AVIONICS AS I WAS IMC IN MOISTURE. NO FURTHER PROBS THERE AFTER.

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.