A high time CFI experienced a temporary DME malfunction, causing him to wonder if he violated den's class B. Utilizing 2 crossing vors, he determined that he was well clear.

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Attributes
ACN	487330
Time
Date	200010
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : den.vor
State Reference	CO
Altitude	msl single value : 7800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d01.tracon
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : commercial pilot : cfi pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 10000 flight time type : 2000
ASRS Report	487330
Person 2
Affiliation	other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Temporary DME malfunction gave wrong distance from den VOR. However, using cross fix from jeffco and falon vors showed we were well clear of class B airspace. Just to be safe, or in case of mode C malfunction, I have filed a NASA report. No need for corrective action.

Original NASA ASRS Text

Title: A HIGH TIME CFI EXPERIENCED A TEMPORARY DME MALFUNCTION, CAUSING HIM TO WONDER IF HE VIOLATED DEN'S CLASS B. UTILIZING 2 XING VORS, HE DETERMINED THAT HE WAS WELL CLR.

Narrative: TEMPORARY DME MALFUNCTION GAVE WRONG DISTANCE FROM DEN VOR. HOWEVER, USING CROSS FIX FROM JEFFCO AND FALON VORS SHOWED WE WERE WELL CLR OF CLASS B AIRSPACE. JUST TO BE SAFE, OR IN CASE OF MODE C MALFUNCTION, I HAVE FILED A NASA RPT. NO NEED FOR CORRECTIVE ACTION.

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.