C206 instructor and trainee had navigation communication failure in mia class east airspace.

Attributes
ACN	499110
Time
Date	200101
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : mia.vortac
State Reference	FL
Altitude	msl single value : 9500
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia.tracon
Operator	general aviation : instructional
Make Model Name	Cessna Stationair/Turbo Stationair 6
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	cruise : level
Route In Use	enroute other
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 120 flight time total : 10300 flight time type : 800
ASRS Report	499110
Person 2
Affiliation	other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : private
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted none taken : detected after the fact other
Consequence	other
Factors
Maintenance	performance deficiency : installation
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Aircraft

Narrative:

While in cruise flight and giving a pilot training who had not flown in 10 yrs, we experienced a complete dual navigation/communication failure in marginal flight conditions. Broadcasted on the TRACON frequency in the blind of our condition, squawked 1200 and continued on to destination. The aft owner had recently updated his radios. I am assuming this update was the problem. Continued the flight VFR.

Original NASA ASRS Text

Title: C206 INSTRUCTOR AND TRAINEE HAD NAV COM FAILURE IN MIA CLASS E AIRSPACE.

Narrative: WHILE IN CRUISE FLT AND GIVING A PLT TRAINING WHO HAD NOT FLOWN IN 10 YRS, WE EXPERIENCED A COMPLETE DUAL NAV/COM FAILURE IN MARGINAL FLT CONDITIONS. BROADCASTED ON THE TRACON FREQ IN THE BLIND OF OUR CONDITION, SQUAWKED 1200 AND CONTINUED ON TO DEST. THE AFT OWNER HAD RECENTLY UPDATED HIS RADIOS. I AM ASSUMING THIS UPDATE WAS THE PROB. CONTINUED THE FLT VFR.

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.